Abstract:
A process for recovering cyanide from feed material containing cyanide and copper involves the steps of: (a) contacting the feed material with a strong base anion exchange resin whereby copper and cyanide from the feed material are adsorbed onto the resin; (b) contacting the resulting resin with an eluant solution containing free cyanide ion to elute copper and cyanide from the resin; (c) separating the eluted resin from the eluting solution or eluate from step (b); (d) acidifying the eluate from step (b) to precipitate copper; (e) separating the acidified solution from the precipitate in step (d) and alkalizing directly or after concentration the separated solution containing HCN; (f) contacting the eluted resin from step (b) with an acid to condition the resin and remove additional cyanide while leaving most of the copper in the resin phase; (g) converting the HCN solution formed in step (f) to cyanide ion, directly or after concentration of the HCN solution, by the addition of alkali; and (h) returning the conditioned resin from step (f) to step (a) above.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part application of U.S. Ser. No. 09/651,553 filed Aug. 30, 2000, now abandoned, which claims the benefit of U.S. Provisional Application No. 60/157,307 filed Oct. 1, 1999. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates to a process for recovering cyanide from feed material containing cyanide and copper and, more particularly, to such a process for recovering cyanide from solutions or pulps containing copper by ion exchange employing a cyanide eluant. 
     As is known, the recovery of gold from copper/gold ores containing high levels of cyanide-soluble copper has been difficult in conventional gold carbon-in-pulp (CIP) processes. Many common copper minerals are soluble in the dilute cyanide solutions typical of leach conditions found in gold cyanidation processes. During leaching, certain copper minerals react with free cyanide to form various cuprous cyanide species that compete with the aurocyanide species for available active sites on the carbon. In conventional CIP plants, high levels of free cyanide are maintained to favour the adsorption of Au(CN) −   2  anion over the Cu(CN) 3   2−  and Cu(CN) 4   3−  anions (M. R. Davis et al., Proposed Solvent Extraction Route for the Treatment of Copper Cyanide Solutions Produced in Leaching of Gold Ores, Melbourne, Australia, RMIT University, July 1998, National Symposium on Cost Effective Gold Recovery from Refractory Ores). 
     Following gold adsorption, the free and complexed cyanide species are generally discarded to a tailings impoundment. Once in the tailings dam, ultra-violet light decomposes free cyanide, naturally detoxifying the tailings solution with time. As the free cyanide level in solution decreases, however, the Cu(CN) 3   2−  and Cu(CN) 4   3−  species also decompose, liberating additional cyanide. This equilibrium effectively buffers the free cyanide concentration in solution, and can result in significant environmental problems. In addition, trace levels of Cu(CN) −   2  in the dam return water consume free cyanide when reintroduced to the cyanide leach circuit. 
     Detoxification is employed when cyanide-bearing tailings cannot be discarded directly into the tailings impoundment due to environmental or safety-related concerns. The high costs of cyanide destruction and excessive cyanide consumption when treating high cyanide soluble copper ores represent a significant portion of total operating costs, often preventing the development of such projects. This has prompted interest in alternative detoxification technologies that remove copper and recover cyanide for re-use in the leaching process. 
     Of the several technologies currently available, only one, the so-called Cyanisorb process (trademark of Coeur d&#39; Alene Mines Corporation) has been commercialized to date. In the Cyanisorb process, reliance is on the simplest aspects of cyanide and metal cyanide chemistry and the process does not employ any ion exchange or adsorption technology. In general, the existing technologies are either too expensive to construct and operate, do not recover all of the complexed cyanide or produce a low-value copper by-product that cannot be marketed. 
     Goldblatt (Recovery of Cyanide from Waste Cyanide Solutions by Ion Exchange, Vol. 51, No. 3, March 1959, Industrial and Engineering Chemistry) teaches the use of ion exchange resins in the recovery of cyanide, water and complexed base materials from the effluent of gold works, but does not teach the recovery of copper. Fleming et al. [U.S. Pat. No. 5,807,421, dated Sep. 15, 1998], teaches a hydrometallurgical extraction process for treating copper feed materials which comprises the steps of:
         (a) treating the feed materials with an aqueous cyanide solution having a molar ratio of CN:Cu of &gt;3 thereby leaching copper and gold;   (b) optionally removing and recovering substantially all gold, if present, from the pregnant leach solution or pulp;   (c) contacting the resulting solution or pulp with an anion exchange resin thereby adsorbing copper cyanide at a CN:Cu ratio of &lt;3:1 and gold cyanide, if present, onto the resin;   (d) separating the resin having copper cyanide and gold cyanide, if present, adsorbed thereon from the now depleted solution or pulp containing no copper, gold or cyanide;   (e) treating the loaded resin obtained in step (d) with an eluant containing copper cyanide at a CN:Cu ratio of between 3.5:1 and 4:1 and a copper concentration of at least 10 grams/liter thereby partially eluting copper cyanide and gold cyanide, if present, from the resin and producing an eluate having a CN:Cu ratio of less than 4:1; and   (f) electrowinning copper metal and gold metal, if present, from the eluate produced in step (e).       

     There remains a need for improved and simpler processes employing anion exchange solvents or resins to concentrate solutions of cyanide prior to reuse, to allow for the economic recovery of copper in a versatile manner and to use cyanide ion (CN − ) as the eluant to produce eluates having low CN:Cu ratios of less than 3.5:1 moles of CN per mole of Cu. 
     SUMMARY OF THE INVENTION 
     Among the objects of the invention may be noted the provision of a process for recovering cyanide and optionally copper from feed material using a strong base anion exchange resin on which copper and cyanide are adsorbed and eluting the resin with free cyanide ion; the provision of such a process in which copper may be precipitated from the eluate resulting from the elution of the loaded resin with free cyanide ion; the provision of a process of the type described in which the resin resulting from the elution step may be conditioned for reuse in the initial resin loading step; the provision of such a process in which elution is carried out without the use of concentrated salts requiring rigorous control of water balance; the provision of a process which produces eluates having a low CN:Cu ratio; the provision of a process in which the copper content of the resin phase is advantageously made greater than about 0.7 moles of Cu per mole of active anion exchange resin sites; and the provision of a process in which the copper concentration in the resin phase is increased by limiting the flow of loaded resin to the subsequent elution step whereby the loaded resin will have a CN:Cu ratio of 2:1 or less and the eluates therefrom approach a CN:Cu ratio of approximately 2-3. Other objects and features will be in part apparent and in part pointed out hereinafter. 
     In one aspect, the present invention is directed to a process for recovering cyanide from feed material containing cyanide and copper comprising the steps of:
         (a) contacting the feed material with a strong base anion exchange resin whereby copper and cyanide from the feed material are adsorbed onto the resin;   (b) contacting the resulting resin with an eluant solution containing free cyanide ion to elute copper and cyanide from the resin;   (c) separating the eluted resin from the eluting solution or eluate from step (b);   (d) acidifying the eluate from step (b) to precipitate copper;   (e) separating the acidified solution from the precipitate in step (d) and alkalizing directly or after concentration the separated solution containing HCN;   (f) contacting the eluted resin from step (b) with an acid to condition the resin and remove additional cyanide while leaving most of the copper in the resin phase;   (g) converting the HCN solution formed in step (f) to cyanide ion, directly or after concentration of the HCN solution, by the addition of alkali; and   (h) returning the conditioned resin from step (f) to step (a) above.       

     In another aspect, the invention is directed to a process for recovering cyanide and optionally copper using a strong base anion exchange resin wherein cyanide soluble copper compounds are contained in the resin phase which is to be loaded with cyanide and copper and wherein the copper content of the resin phase is greater than about 0.7 moles of Cu per mole of active anion exchange sites. 
     In still another aspect, the invention is directed to a process for recovering cyanide and optionally copper using a strong base anion exchange resin wherein cyanide soluble copper compounds are contained in the resin phase which is to be loaded with cyanide and copper and wherein the flow of the loaded resin to a subsequent elution step is limited so that the loaded resin has a CN:Cu ratio of 2:1 or less and the eluates therefrom approach a CN:Cu ratio of approximately 2-3. 
     Other features of the processes of the invention will be discussed hereinafter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a flow diagram illustrating cyanide recovery from solutions or pulps containing copper by ion exchange using cyanide eluant in accordance with the process of the invention; 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the practice of the present invention, the feed material to be treated may be constituted by pulps or solutions containing copper and cyanide as well as other metal compounds. If the feed material contains zinc, it is preferred to optionally precipitate zinc from the feed material with soluble sulfide ions as the precipitating species before the anion exchange resin loading steps. Removal of the zinc sulfide precipitate is not always necessary as such precipitate will not load on the anion exchange resin. 
     The feed material is contacted with a strong base anion exchange resin until the resin is well loaded, i.e. most or practically all of the exchange sites on the resin are occupied by metal cyanide complexes or thiocyanate ion, SCN − . The resin is a strong base anion exchange resin conditioned as described below in which the anion of the conditioning acid as described below has been largely displaced during the loading step. Various strong base anion exchange resins known to the art may be employed such as “Amberlite IRA 900-C” (Type I), “Amberlite IRA 904” (Type I) and “Amberlite IRA 910” (Type II) from Rohm and Haas, “Dowex M 41” (Type I), “Dowex MSA 1” (Type 1), “Dowex M 42” (Type 2), “Dowex MSA 2” (Type 2) and “Dowex 21K” (Gel) from Dow Chemical, and Lewatit “M 600” and “MP 500” from Bayer, and “A 500” and “A 500 U” from Purolite. The resin flow in this initial step is adjusted versus the feed material flow so that most or practically all of the copper and cyanide are removed from the feed material. The resin should not be overloaded which results when the resin phase contacts too much feed material to the point where copper and cyanide begin to leach out of the resin phase and the feed material being treated is no longer well depleted of copper and cyanide. After the resin is well loaded with cyanide metal complexes and/or SCN −  anions, it is separated from the treated feed material. Other compounds of zinc or copper which complex with cyanide may also be added to the feed material to reduce the free cyanide concentration and the CN:CU molar ratio to facilitate loading. 
     The loaded resin is then contacted with an eluant solution containing free cyanide ion preferably in the form of NaCN or Ca(CN) 2 . This results in the elution of part of the copper and cyanide from the resin. The amount of copper removed in this elution step is controlled to approximately match the amount of copper adsorbed in the resin loading step described above. Preferably, the eluant solution contains a quantity of cyanide ion that will produce an eluate of approximately three to four moles of cyanide per one mole of copper. The elution step is carried out without the use of concentrated salts requiring rigorous control of water balance. The eluted resin is separated from the eluting solution, optionally washed and then advanced to the conditioning step described hereinafter. 
     The eluate from the above described elution step is then acidified to precipitate copper therefrom. The copper may be precipitated as cuprous sulfide (Cu 2 S), cuprous cyanide (CuCN) or cuprous thiocyanate (CuSCN) by the addition of an appropriate precipitating agent, e.g. to precipitate Cu 2 S, a water soluble sulfide may be added. If HCl is used for precipitation, it can be derived from H 2 SO 4  and CaCl 2 . Any of the copper precipitates can be removed from the acidified eluant before or after the removal of HCN from the separated solution as described below. 
     The copper precipitates resulting from the precipitation step may be handled in a variety of further process steps in accordance with the invention. Any of the copper precipitates can be discarded to the tailings pond and cyanide destruction can be used to eliminate cyanide (CuCN) from the precipitate. Alternatively, any of the copper precipitates can be treated for residual HCN removal and then smelted or sent to smelters for copper recovery. In the event smelters prefer Cu 2 S over CuCN or CuSCN, the latter two cuprous compounds can be converted to Cu 2 S by contact with water soluble sulfide at the proper pH. If desired, CuCN and CuSCN can be fed to electrowinning cells for the production of copper cathodes with the cyanide being optionally recovered from these cells. Any of the copper precipitates can be partially recycled to the resin loading step described above to aid in adsorption of uncomplexed cyanide ion by means of the reaction of cyanide ion in the feed material with any of the copper precipitates to form copper cyanide complexes which load better than does cyanide ion, CN − . This is especially advantageous when it is desired to force SCN −  or other undesirable anions through the resin loading step with minimum adsorption on the resin. In a counter-current loading scheme, the CuSCN precipitate can be introduced toward the same end of the loading train where the eluted resin is introduced thereby encouraging SCN −  escape through the loading step. 
     After the acidified eluate is separated from the copper precipitate, the separate solution now containing HCN is further concentrated or is totally or partially alkalized and used in the above-mentioned elution step or in other places in the hydrometallurgical plant. Sodium hydroxide may be used for alkalizing the HCN solution to produce a sodium cyanide bearing eluate and a copper precipitate with little or no gypsum present. Cyanide for the elution step can also come from other sources. The HCN solution recycled to the leach can be alkalized with lime. 
     Any of the copper precipitates which are diluted with gypsum can be upgraded by a) selective precipitation in which part of the gypsum is precipitated with little or no copper product present; or b) flotation of a gypsum/copper precipitate to separate the copper compound from the gypsum. 
     The eluted resin from the above-described elution step, still containing some copper and cyanide, is then “conditioned” by contact with an acid during which more cyanide is removed as HCN while leaving most of the copper in the resin phase. The resin is separated from the acid solution containing HCN and the HCN solution converted directly to cyanide ion by alkali for use as appropriate or is first concentrated and then converted to cyanide ion. The resin, now “conditioned”, is preferably first washed to recover residual HCN and acid and the “conditioned” resin is then returned to the initial resin loading step described above. Acceptable copper compounds remaining in the resin phase after the acid contact mentioned above are cuprous sulfide (Cu 2 S), cuprous thiocyanate (CuSCN) and cuprous cyanide (CuCN). 
     In a refinement of the process of the invention for recovering cyanide and optionally copper using a strong base anion exchange resin wherein cyanide soluble copper compounds are contained in the resin phase which is to be loaded with cyanide and copper, it has been found advantageous for the copper content of the resin phase to be greater than about 0.7 moles of Cu per mole of active anion exchange resin sites. 
     In another refinement of the process of the invention, the copper concentration on the resin is intentionally increased thereby producing richer copper eluate solutions from the elution step described above. This increase in resin phase copper concentration is accomplished by limiting the flow of loaded resin, from the step wherein the feed material is contacted with the anion exchange resin, going to the step in which copper is eluted as described above. This results in only part of the loaded resin going to the copper elution step. In this refinement, the copper eluate will approach a CN:Cu mole ratio of 2:1 and less acid and base will be needed in the process. In this refinement, the loaded resin will have a CN:Cu ratio of 2:1 or less and the eluates will approach a CN:Cu ratio of approximately 2-3. 
     The overall processes of the present invention thus provide for the elution and recovery of copper and cyanide from anion exchange resins using cyanide ion (CN − ) as the eluant to give eluates of less than 3.5:1 moles of CN per mole of Cu. The process of the invention is also capable of producing concentrated copper bearing eluates of over 50 grams of copper per liter of eluate. Such strong eluate solutions promote efficient, economic recovery of copper and cyanide therefrom. 
     The following examples illustrate the practice of the invention. 
     EXAMPLE 1 
     
       
         
               
               
             
               
             
               
               
             
           
               
                   
               
               
                 Project LR130 
                 Test AFR Operator EM 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Preparation of Feed 1 Solution for AFR Tests 1-3 
               
             
          
           
               
                 Purpose: 
                 To prepare a synthetic copper cyanide solution for AFR testwork. 
               
               
                 Procedure: 
                 The solution, saturated with gypsum and containing 400 mg/L Cu. 750 mg/L CN 
               
               
                   
                 (CN:Cu mole ratio 4.6:1). 30 mg/L Zn and 350 mg/L SCN was prepared by dissolving 
               
               
                   
                 8.92 g NaCN 99%, 4.51 g CuCN, 1.06 g ZnSO 40 .7H 2 O and 4.69 g KSCN in water to 8 L 
               
               
                   
                 The pH was adjusted to ˜11 with lime. A head sample was taken for analysis of 
               
               
                   
                 CN(T), Cu, Zn Ca and SCN. 
               
               
                 Solution 
                 ˜8 L water saturated with CaSO 4   
               
               
                 Composition: 
                 8.92 g NaCN (99%) 
               
               
                   
                 4.69 g KSCN 
               
               
                   
                 4.51 g CuCN. 
               
               
                   
                 1.06 g ZnSO 40 .7H 2 O 
               
               
                 Results: 
                 Feed 1 solution analyzed 641 mg/L CN(T), 403 mg/L Cu, 29.2 mg.L Zn, 595 mg/L Ca 
               
               
                   
                 and 315 mg/L SCN. 
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR-130 
                 Test AFR-1 Operator: EM 
               
               
                   
               
               
                 Purpose: 
                 To conduct an AFR (Acidification, Filtration and Reneutralization) test on the AFR 
               
               
                   
                 synthetic feed solution at pH 3. 
               
               
                 Procedure: 
                 The feed (1 L) was placed in a 2 L air-tight kettle. Mixing was provided with a large 
               
               
                   
                 magnetic stir bar. 
               
               
                   
                 H 2 SO 4  9.8% solution was added to the kettle to adjust and maintain the solution at pH 3 
               
               
                   
                 for 60 minutes. Solution samples were taken at 5, 15, 30 and 60 and filtered on a 
               
               
                   
                 milipore filter. The filter flask contained some NaOH to raise the pH of the filtrate to &gt;11. 
               
               
                   
                 The filtrates were analyzed for CN T , SCN, Cu and Zn. 
               
               
                   
                 The final solution was filtered and the filter cake was washed with water. The washed 
               
               
                   
                 cake was dried at ˜80° C. for analysis of CN(T) and S(T). 
               
               
                 Feed: 
                 1 L synthetic solution 
               
               
                   
                 (641 mg/L CN(T), 403 mg L Cu, 29.2 mg/L Zn, 595 mg/L Ca and 315 mg/L SCN) 
               
               
                 Temperature: 
                 Ambient (˜24° C.) 
               
               
                 pH 
                 3 with 9.8% H 2 SO 4  solution 
               
               
                 Sampling: 
                 5, 15, 30 and 60 minutes 
               
               
                   
               
             
          
           
               
                 (pH 3 with H 2 SO 4 ) 
               
               
                 Results: 
               
             
          
           
               
                   
                 Cumu. H 2 SO 4   
                   
               
             
          
           
               
                   
                 9.8% 
                 Equiv. 
                   
                 Solid Assay 
                 Cyanide Balance 
               
             
          
           
               
                   
                 Sol. 
                 100% 
                 Solution Analysis 
                 Dry 
                   
                 In 
                 In 
                   
               
             
          
           
               
                 Time 
                 Added 
                 H 2 SO 4   
                 CN T   
                 CNS 
                 Cu 
                 Zn 
                 Wt. 
                 CN T   
                 S T   
                 Cu 
                 Zn 
                 Solution* 
                 Precip. 
                 Total 
               
               
                 min 
                 g 
                 g/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
               
               
                   
               
               
                   
                   
                   
                 641 
                 315 
                 403 
                 29.2 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                  5 
                 20 
                 2.0 
                 484 
                 291 
                 36.0 
                 28.3 
                   
                   
                   
                   
                   
                 77.0 
               
               
                 15 
                 21 
                 2.1 
                 477 
                 279 
                 34.0 
                 25.6 
                   
                   
                   
                   
                   
                 76.0 
               
               
                 30 
                 22 
                 2.2 
                 515 
                 287 
                 34.6 
                 26.8 
                   
                   
                   
                   
                   
                 82.1 
               
               
                 60 
                 22 
                 2.2 
                 475 
                 242 
                 39.3 
                 26.4 
                 0.52 
                 13.4 
                 9.77 
                 NA 
                 NA 
                 75.7 
                 10.9 
                 86.6 
               
               
                   
               
               
                 *Taking into account volume changes  
               
               
                 NA: not analyzed  
               
               
                 Feed volume: 1 L  
               
               
                 AVR Recoverable CN in Feed: 476 mg/L  
               
               
                 CN Recovery: 485 mg/L feed or 102% AVR recoverable  
               
               
                 Notes:  
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4  = CN T    
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate  
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR-130 
                 Test AFR-2 Operator: EM 
               
               
                   
               
               
                 Purpose: 
                 To conduct an AFR (Acidification, Filtration and Reneutralization) test on the AFR 
               
               
                   
                 synthetic feed solution at pH 2. 
               
               
                 Procedure: 
                 The feed (1 L) was placed in a 2 L air-tight kettle. Mixing was provided with a large 
               
               
                   
                 magnetic stir bar. 
               
               
                   
                 H 2 SO 4   9.8% solution was added to the kettle to adjust and maintain the solution at pH 2 
               
               
                   
                 for 60 minutes. Solution samples were taken at 5, 15, 30 and 60 and filtered on a 
               
               
                   
                 milipore filter. Tne filter flask contained some NaOH to raise the pH of the filtrate to &gt;11. 
               
               
                   
                 The filtrates were analyzed for CN T , SCN, Cu and Zn. 
               
               
                   
                 The final solution was filtered and the filter cake was washed with water. The washed 
               
               
                   
                 cake was dried at ˜80° C. for analysis of CN(T) and S(T). 
               
               
                 Feed: 
                 1 L synthetic solution 
               
               
                   
                 (641 mg/L CN(T), 403 mg/L Cu, 29.2 mg/L Zn, 595 mg/L Ca and 315 mg/L SCN) 
               
               
                 Temperature: 
                 Ambient (˜24° C.) 
               
               
                 pH 
                 2 with 9.8% H 2 SO 4  solution 
               
               
                 Sampling: 
                 5, 15, 30 and 60 minutes 
               
               
                   
               
             
          
           
               
                 (pH 2 with H 2 SO 4 ) 
               
               
                 Results: 
               
             
          
           
               
                   
                 Cumu. H 2 SO 4   
                   
               
             
          
           
               
                   
                 9.8% 
                 Equiv. 
                   
                 Solid Assay 
                 Cyanide Balance 
               
             
          
           
               
                   
                 Sol. 
                 100% 
                 Solution Analysis 
                 Dry 
                   
                 In 
                 In 
                   
               
             
          
           
               
                 Time 
                 Added 
                 H 2 SO 4   
                 CN T   
                 CNS 
                 Cu 
                 Zn 
                 Wt. 
                 CN T   
                 S T   
                 Cu 
                 Zn 
                 Solution* 
                 Precip. 
                 Total 
               
               
                 min 
                 g 
                 g/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
               
               
                   
               
               
                   
                   
                   
                 641 
                 315  
                 403 
                 29.2 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                  5 
                 30 
                 2.9 
                 475 
                 22 
                 3.13 
                 30.3 
                   
                   
                   
                   
                   
                 76.3 
               
               
                 15 
                 31 
                 3.0 
                 461 
                 16 
                 5.99 
                 28.4 
                   
                   
                   
                   
                   
                 74.1 
               
               
                 30 
                 31 
                 3.0 
                 574 
                 15 
                 12.1 
                 25.6 
                   
                   
                   
                   
                   
                 92.3 
               
               
                 60 
                 31 
                 3.0 
                 477 
                 20 
                 21.1 
                 28.4 
                 0.61 
                 0.59 
                 24.6 
                 NA 
                 NA 
                 76.6 
                 0.6 
                 77.2 
               
               
                   
               
               
                 *Taking into account volume changes  
               
               
                 NA: not analyzed  
               
               
                 Feed volume: 1 L  
               
               
                 AVR Recoverable CN in Feed: 476 mg/L  
               
               
                 CN Recovery: 491 mg/L feed or 103% AVR recoverable  
               
               
                 Notes:  
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4  = CN T    
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate  
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR-130 
                 Test AFR-3 Operator: EM 
               
               
                   
               
               
                 Purpose: 
                 To conduct an APR (Acidification, Filtration and Reneutralization) test on the AFR 
               
               
                   
                 synthetic feed solution at pH 2 using H 2 SO 3 . 
               
               
                 Procedure: 
                 The feed (1 L) was placed in a 2 L air-tight kettle. Mixing was provided with a large 
               
               
                   
                 magnetic stir bar. 
               
               
                   
                 H 2 SO 3  7.8% solution was added to the kettle to adjust and maintain the solution at pH 2 
               
               
                   
                 for 60 minutes. Solution samples were taken at 5, 15, 30 and 60 and filtered on a 
               
               
                   
                 milipore filter. The filter flask contained some NaOH to raise the pH of the filtrate to &gt;11. 
               
               
                   
                 The filtrates were analyzed for CN T , SCN, Cu and Zn. 
               
               
                   
                 The final solution was filtered and the filter cake was washed with water. The washed 
               
               
                   
                 cake was dried at ˜80° C. for analysis of CN(T) and S(T). 
               
               
                 Feed: 
                 1 L synthetic solution 
               
               
                   
                 (641 mg/L CN(T), 403 mg/L Cu, 29.2 mg/L Zn, 595 mg/L Ca and 315 mg/L SCN) 
               
               
                 Temperature: 
                 Ambient (˜24° C.) 
               
               
                 pH 
                 2 with 7.8% H 2 SO 3  solution 
               
               
                 Sampling: 
                 5, 15, 30 and 60 minutes 
               
               
                   
               
             
          
           
               
                 (pH 2 with H 2 SO 3 ) 
               
               
                 Results: 
               
             
          
           
               
                   
                 Cumu. H 2 SO 4   
                   
               
             
          
           
               
                   
                 9.8% 
                 Equiv. 
                   
                 Solid Assay 
                 Cyanide Balance 
               
             
          
           
               
                   
                 Sol. 
                 100% 
                 Solution Analysis 
                 Dry 
                   
                 In 
                 In 
                   
               
             
          
           
               
                 Time 
                 Added 
                 H 2 SO 4   
                 CN T   
                 CNS 
                 Cu 
                 Zn 
                 Wt. 
                 CN T   
                 S T   
                 Cu 
                 Zn 
                 Solution* 
                 Precip. 
                 Total 
               
               
                 min 
                 g 
                 g/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
               
               
                   
               
               
                   
                   
                   
                 641 
                  315 
                 403 
                 29.2 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                  5 
                   
                   
                 456 
                  38 
                 5.51 
                 25.5 
                   
                   
                   
                   
                   
                 71.1 
               
               
                 15 
                   
                   
                 456 
                 1184 
                 4.03 
                 27.0 
                   
                   
                   
                   
                   
                 71.1 
               
               
                 30 
                   
                   
                 465 
                 1212 
                 3.56 
                 26.3 
                   
                   
                   
                   
                   
                 72.5 
               
             
          
           
               
                 60 
                 Not recorded 
                 452 
                 1190 
                 3.74 
                 26.7 
                 0.70 
                 1.54 
                 23.6 
                 NA 
                 NA 
                 74.7 
                 1.7 
                 76.4 
               
               
                   
                   
                   
                 ? 
               
               
                   
               
               
                 *Taking into account volume changes  
               
               
                 NA: not analyzed  
               
               
                 Feed volume: 1 L  
               
               
                 AVR Recoverable CN in Feed: 476 mg/L  
               
               
                 CN Recovery: 479 mg/L feed or 101% AVR recoverable  
               
               
                 Notes:  
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4  = CN T    
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate  
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
             
           
               
                   
               
               
                 Project LR130 
                 Test AFR-4 Operator ME 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Preparation of Feed 2 Solution for AFR-4 
               
             
          
           
               
                 Purpose: 
                 To prepare a synthetic copper cyanide solution for AFR testwork. 
               
               
                 Procedure: 
                 The solution, saturated with gypsum and containing 500 mg/L Cu, 920 mg/L CN 
               
               
                   
                 (CN:Cu mole ratio 4.6:1), 30 mg/L Zn and 350 mg/L SCN, was prepared by dissolving 
               
               
                   
                 the require amounts of NaCN, CuCN, ZnSO 40 .7H 2 O and KSCN in water. 
               
               
                   
                 The pH was adjusted to ˜11 with lime. A head sample was taken for analysis of 
               
               
                   
                 CN(T), Cu, Zn Ca and SCN. 
               
               
                 Solution 
                 ˜2 L water saturated with CaSO 4   
               
               
                 Composition: 
                 2.84 g NaCN (95%) 
               
               
                   
                 1.17 g KSCN 
               
               
                   
                 1.41 g CuCN, 
               
               
                   
                 0.26 g ZnSO 40 .7H 2 O 
               
               
                 Results: 
                 The solution analyzed 936 mg/L CN(T), 472 mg/L Cu, 42.9 mg/L Zn, 577 mg/L Ca 
               
               
                   
                 and 401 mg/L SCN. 
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR-130 
                 Test AFR-4 Operator: EM 
               
               
                   
               
               
                 Purpose: 
                 To conduct an AFR (Acidification, Filtration and Reneutralization) test on the AFR 
               
               
                   
                 synthetic feed solution (500 mg/L Cu, 350 mg/L SCN, 920 mg/L CN and 30 mg/L Zn) 
               
               
                   
                 at pH 2. 
               
               
                 Procedure: 
                 The feed (1 L) was placed in a 2 L air-tight kettle. Mixing was provided with a large 
               
               
                   
                 magnetic stir bar. 
               
               
                   
                 H 2 SO 4  19.5% solution was added to the kettle to adjust and maintain the solution at pH 2 
               
               
                   
                 for 60 minutes. Solution samples were taken at 5, 15, 30 and 60 and filtered on a 
               
               
                   
                 milipore filter. The filter flask contained some NaOH to raise the pH of the filtrate to &gt;11. 
               
               
                   
                 The filtrates were analyzed for CN T , SCN, Cu and Zn. 
               
               
                   
                 The final solution was filtered and the filter cake was washed with water. The washed 
               
               
                   
                 cake was dried at ˜80° C. for analysis of CN(T), Cu, Zn and S(T). 
               
               
                 Feed: 
                 1 L synthetic solution (Feed 2) 
               
               
                   
                 (936 mg/L CN(T), 472 mg/L Cu, 42.9 mg/L Zn, 577 mg/L Ca and 416 mg/L SCN) 
               
               
                 Temperature: 
                 Ambient (˜26° C.) 
               
               
                 pH 
                 2 with 19.5% H 2 SO 4  solution 
               
               
                 Sampling: 
                 5, 15, 30 and 60 minutes 
               
               
                   
               
             
          
           
               
                 (pH 2 with H 2 SO 4 ) 
               
               
                 Results: 
               
             
          
           
               
                   
                 Cumu. H 2 SO 4   
                   
               
             
          
           
               
                   
                 19.5% 
                 Equiv. 
                   
                 Solid Assay 
                 Cyanide Balance 
               
             
          
           
               
                   
                 Sol. 
                 100% 
                 Solution Analysis 
                 Dry 
                   
                 In 
                 In 
                   
               
             
          
           
               
                 Time 
                 Added 
                 H 2 SO 4   
                 CN T   
                 CNS 
                 Cu 
                 Zn 
                 Wt. 
                 CN T   
                 S T   
                 Cu 
                 Zn 
                 Solution* 
                 Precip. 
                 Total 
               
               
                 min 
                 g 
                 g/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
               
               
                   
               
               
                 Feed 
                 — 
                 — 
                 936 
                 401  
                 472 
                 42.9 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 2 
               
               
                  5 
                 16.1 
                 3.1 
                 806 
                 43 
                 5.78 
                 37.7 
                   
                   
                   
                   
                   
                 87.5 
               
               
                 15 
                 16.1 
                 3.1 
                 806 
                 34 
                 7.17 
                 36.3 
                   
                   
                   
                   
                   
                 87.5 
               
               
                 30 
                 16.1 
                 3.1 
                 835 
                 33 
                 8.96 
                 35.4 
                   
                   
                   
                   
                   
                 90.6 
               
               
                 60 
                 16.1 
                 3.1 
                 814 
                 29 
                 12.0 
                 35.0 
                 0.85 
                 2.77 
                 23.1 
                 51.8 
                 0.04 
                 88.4 
                 2.5 
                 90.9 
               
               
                   
               
               
                 *Taking into account volume changes  
               
               
                 NA: not analyzed  
               
               
                 Feed volume: 1 L  
               
               
                 AVR Recoverable CN in Feed: 743 mg/L  
               
               
                 CN Recovery: 827 mg/L feed or 111% AVR recoverable  
               
               
                 Notes:  
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4  = CN T    
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate  
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
             
           
               
                   
               
               
                 Project LR130 
                 Test AFR-5 Operator ME 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Preparation of Feed 3 Solution for Test AFR-5 
               
             
          
           
               
                 Purpose: 
                 To prepare a synthetic copper cyanide solution for AFR testwork. 
               
               
                 Procedure: 
                 The solution, saturated with gypsum and containing ˜500 mg/L Cu, ˜920 mg/L CN 
               
               
                   
                 (CN:Cu mole ratio 4.6:1), 30 mg/L Zn and 350 mg/L SCN, was prepared by dissolving 
               
               
                   
                 the require amounts of NaCN, CuCN, ZnSO 40 .7H 2 O and KSCN in water. 
               
               
                   
                 The pH was adjusted to ˜11 with lime. A head sample was taken for analysis of 
               
               
                   
                 CN(T), Cu, Zn Ca and SCN. 
               
               
                 Solution 
                 ˜2 L water saturated with CaSO 4   
               
               
                 Composition: 
                 2.84 g NaCN (95%) 
               
               
                   
                 1.17 g KSCN 
               
               
                   
                 1.41 g CuCN, 
               
               
                   
                 0.26 g ZnSO 40 .7H 2 O 
               
               
                 Results: 
                 The solution analyzed 1060 mg/L CN(T), 500 mg/L Cu, 54 mg/L Zn, 540 mg/L Ca 
               
               
                   
                 and 328 mg/L SCN. 
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR-130 
                 Test AFR-5 Operator: EM 
               
               
                   
               
               
                 Purpose: 
                 To conduct an AFR (Acidification, Filtration and Reneutralization) test on the AFR 
               
               
                   
                 synthetic feed solution (500 mg/L Cu, 350 mg/L SCN. 920 mg/L CN and 30 mg, L Zn) 
               
               
                   
                 at pH 2. 
               
               
                 Procedure: 
                 The feed (1 L) was placed in a 2 L air-tight kettle. Mixing was provided with a large 
               
               
                   
                 magnetic stir bar. 
               
               
                   
                 H 2 SO 4  19.5% solution was added to the kettle to adjust and maintain the solution at pH 2 
               
               
                   
                 for 60 minutes. Solution samples were taken at 5, 15, 30 and 60 and filtered on a 
               
               
                   
                 milipore filter. The filter flask contained some NaOH to raise the pH of the filtrate to &gt;11. 
               
               
                   
                 The filtrates were analyzed for CN T , SCN, Cu and Zn. 
               
               
                   
                 The final solution was filtered and the filter cake was washed with water. The washed 
               
               
                   
                 cake was dried at ˜80° C. for analysis of CN(T), Cu, Zn and S(T). 
               
               
                 Feed: 
                 1 L synthetic solution (Feed 3) 
               
               
                   
                 (1060 mg/L CN(T), 500 mg/L Cu, 54 mg L Zn, 540 mg L Ca and 328 mg/L SCN) 
               
               
                 Temperature: 
                 Ambient (˜26° C.) 
               
               
                 pH 
                 2 with 19.5% H 2 SO 4  solution 
               
               
                 Sampling: 
                 5, 15, 30 and 60 minutes 
               
               
                   
               
             
          
           
               
                 (pH 2 with H 2 SO 4 ) 
               
               
                 Results: 
               
             
          
           
               
                   
                 Cumu. H 2 SO 4   
                   
               
             
          
           
               
                   
                 19.5% 
                 Equiv. 
                   
                 Solid Assay 
                 Cyanide Balance 
               
             
          
           
               
                   
                 Sol. 
                 100% 
                 Solution Analysis 
                 Dry 
                   
                 In 
                 In 
                   
               
             
          
           
               
                 Time 
                 Added 
                 H 2 SO 4   
                 CN T   
                 CNS 
                 Cu 
                 Zn 
                 Wt. 
                 CN T   
                 S T   
                 Cu 
                 Zn 
                 Solution* 
                 Precip. 
                 Total 
               
               
                 min 
                 g 
                 g/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
               
               
                   
               
               
                  0 
                 — 
                 — 
                 1060 
                 328  
                 500 
                 54.0 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                  5 
                 13.9 
                 2.7 
                 749 
                 83 
                 7.78 
                 41.0 
                   
                   
                   
                   
                   
                 71.6 
               
               
                 15 
                 14.5 
                 2.8 
                 835 
                 65 
                 8.40 
                 39.0 
                   
                   
                   
                   
                   
                 79.9 
               
               
                 30 
                 14.5 
                 2.8 
                 835 
                 61 
                 9.70 
                 41.0 
                   
                   
                   
                   
                   
                 79.9 
               
               
                 60 
                 14.5 
                 2.8 
                 807 
                 50 
                 2.59 
                 41.0 
                 0.90 
                 6.48 
                 18.2 
                 50.1 
                 0.03 
                 77.2 
                 5.5 
                 82.7 
               
               
                   
               
               
                 *Taking into account volume changes  
               
               
                 NA: not analyzed  
               
               
                 Feed volume: 1 L  
               
               
                 AVR Recoverable CN in Feed: 855 mg/L  
               
               
                 CN Recovery: 819 mg/L feed or 96% AVR recoverable  
               
               
                 Notes:  
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4  = CN T    
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate  
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
             
           
               
                   
               
               
                 Project LR130 
                 Test AFR-6 Operator ME 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Preparation of Feed 4 Solution for Test AFR-6 
               
             
          
           
               
                 Purpose: 
                 To prepare a synthetic copper cyanide solution for AFR testwork 
               
               
                 Procedure: 
                 The solution, saturated with gypsum and containing ˜500 mg/L Cu, ˜820 mg/L CN 
               
               
                   
                 (CN:Cu mole ratio 4:1), 30 mg/L Zn and 350 mg/L SCN, was prepared by dissolving 
               
               
                   
                 the require amounts of NaCN, CuCN, ZnSO 40 .7H 2 O and KSCN in water. 
               
               
                   
                 The pH was adjusted to ˜11 with lime. A head sample was taken for analysis of 
               
               
                   
                 CN(T), Cu, Zn Ca and SCN. 
               
               
                 Solution 
                 ˜2 L water saturated with CaSO 4   
               
               
                 Composition: 
                 2.44 g NaCN (95%) 
               
               
                   
                 1.17 g KSCN 
               
               
                   
                 1.41 g CuCN, 
               
               
                   
                 0.26 g ZnSO 40 .7H 2 O 
               
               
                 Results: 
                 Feed 4 solution analyzed 1010 mg/L CN(T), 514 mg/L Cu, 39.3 mg/L Zn, 763 mg/L Ca 
               
               
                   
                 and 308 mg/L SCN. 
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR-130 
                 Test AFR-6 Operator: ME 
               
               
                   
               
               
                 Purpose: 
                 To conduct an AFR (Acidification, Filtration and Reneutralization) test on the AFR 
               
               
                   
                 synthetic feed solution (500 mg/L Cu, 350 mg L SCN, 820 mg/L CN and 30 mg/L Zn) 
               
               
                   
                 at pH 2. 
               
               
                 Procedure: 
                 The feed (1 L) was placed in a 2 L air-tight kettle. Mixing was provided with a large 
               
               
                   
                 magnetic stir bar. 
               
               
                   
                 H 2 SO 4  19.5% solution was added to the kettle to adjust and maintain the solution at pH 2 
               
               
                   
                 for 60 minutes. Solution samples were taken at 5, 15, 30 and 60 and filtered on a 
               
               
                   
                 milipore filter. The filter flask contained some NaOH to raise the pH of the filtrate to &gt;1 
               
               
                   
                 The filtrates were analyzed for CN T , SCN, Cu and Zn. 
               
               
                   
                 The final solution was filtered and the filter cake was washed with water. The washed 
               
               
                   
                 cake was dried at ˜80° C. for analysis of CN(T), Cu, Zn and S(T). 
               
               
                 Feed: 
                 1 L synthetic solution (Feed 4) 
               
               
                   
                 (1010 mg/L CN(T), 514 mg/L Cu, 39.3 mg/L Zn, 763 mg/L Ca and 308 mg/L SCN) 
               
               
                 Temperature: 
                 Ambient (˜26° C.) 
               
               
                 pH 
                 2 with 19.5% H 2 SO 4  solution 
               
               
                 Sampling: 
                 5, 15, 30 and 60 minutes 
               
               
                   
               
             
          
           
               
                 (pH 2 with H 2 SO 4 ) 
               
               
                 Results: 
               
             
          
           
               
                   
                 Cumu. H 2 SO 4   
                   
               
             
          
           
               
                   
                 19.5% 
                 Equiv. 
                   
                 Solids Assay 
                 Cyanide Balance 
               
             
          
           
               
                   
                 Sol. 
                 100% 
                 Solution Analysis 
                 Dry 
                   
                 In 
                 In 
                   
               
             
          
           
               
                 Time 
                 Added 
                 H 2 SO 4   
                 CN T   
                 CNS 
                 Cu 
                 Zn 
                 Wt. 
                 CN T   
                 S T   
                 Cu 
                 Zn 
                 Solution* 
                 Precip. 
                 Total 
               
               
                 min 
                 g 
                 g/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
               
               
                   
               
               
                 Feed 
                 — 
                 — 
                 1010 
                 308  
                 514 
                 39.3 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                  4 
               
               
                  5 
                 15.1 
                 2.9 
                 890 
                 45 
                 6.78 
                 35.9 
                   
                   
                   
                   
                   
                 89.4 
               
               
                 15 
                 15.1 
                 2.9 
                 845 
                 38 
                 7.50 
                 36.7 
                   
                   
                   
                   
                   
                 84.9 
               
               
                 30 
                 15.1 
                 2.9 
                 845 
                 35 
                 9.62 
                 36.5 
                   
                   
                   
                   
                   
                 84.9 
               
               
                 60 
                 15.1 
                 2.9 
                 850 
                 35 
                 18.5 
                 36.9 
                 1.22 
                 4.26 
                 19.8 
                 35.8 
                 0.01 
                 85.4 
                 5.1 
                 90.6 
               
               
                   
               
               
                 *Taking into account volume changes  
               
               
                 NA: not analyzed  
               
               
                 Feed volume: 1 L  
               
               
                 AVR Recoverable CN in Feed: 800 mg/L  
               
               
                 CN Recovery: 863 mg/L feed or 108% AVR recoverable  
               
               
                 Notes:  
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4  = CN T    
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate  
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
             
           
               
                   
               
               
                 Project LR130 
                 Test AFR-7 Operator ME 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Preparation of Feed 5 Solution for Test AFR-7 
               
             
          
           
               
                 Purpose: 
                 To prepare a synthetic copper cyanide solution for AFR testwork 
               
               
                 Procedure: 
                 The solution, saturated with gypsum and containing 400 mg/L Cu. 750 mg/L CN 
               
               
                   
                 (CN:Cu mole ratio 4.6:1). 30 mg/L Zn and 350 mg/L SCN was prepared by dissolving 
               
               
                   
                 1.95 g NaCN 95%, 1.13 g CuCN, 0.26 g ZnSO 40 .7H 2 O and 1.17 g KSCN in water to 2 L 
               
               
                   
                 The pH was adjusted to ˜11 with lime. A head sample was taken for analysis of 
               
               
                   
                 CN(T), Cu, Zn Ca and SCN. 
               
               
                 Solution 
                 ˜2 L water saturated with CaSO 4   
               
               
                 Composition: 
                 1.95 g NaCN (95%) 
               
               
                   
                 1.17 g KSCN 
               
               
                   
                 1.13 g CuCN. 
               
               
                   
                 0.26 g ZnSO 40 7H 2 O 
               
               
                 Results: 
                 Feed 5 solution analyzed 634 mg/L CN(T), 374 mg/L Cu, 37.8 mg.L Zn, 645 mg/L Ca 
               
               
                   
                 and 339 mg/L SCN. 
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR-130 
                 Test AFR-7 Operator: EM 
               
               
                   
               
               
                 Purpose: 
                 To conduct an AFR (Acidification, Filtration and Reneutralization) test on the AFR 
               
               
                   
                 synthetic feed solution at pH 1.5. 
               
               
                 Procedure: 
                 The feed (1 L) was placed in a 2 L air-tight kettle. Mixing was provided with a large 
               
               
                   
                 magnetic stir bar. 
               
               
                   
                 H 2 SO 4  19.5% solution was added to the kettle to adjust and maintain the solution at 
               
               
                   
                 pH 1.5 for 60 minutes. Solution samples were taken at 5, 15, 30 and 60 and filtered on 
               
               
                   
                 a milipore filter. The filter flask contained some NaOH to raise the pH of the filtrate 
               
               
                   
                 to &gt;11. The filtrates were analyzed for CN T , SCN, Cu and Zn. 
               
               
                   
                 The final solution was filtered and the filter cake was washed with water. The washed 
               
               
                   
                 cake was dried at ˜80° C. for analysis of CN(T) and S(T). 
               
               
                 Feed: 
                 1 L Feed 5 synthetic solution 
               
               
                   
                 (634 mg/L CN(T), 374 mg/L Cu, 37.8 mg L Zn, 645 mg/L Ca and 339 mg/L SCN) 
               
               
                 Temperature: 
                 Ambient (˜23° C.) 
               
               
                 pH 
                 1.5 with 19.5% H 2 SO 4  solution 
               
               
                 Sampling: 
                 5, 15, 30 and 60 minutes 
               
               
                   
               
             
          
           
               
                 (pH 1.5 with H 2 SO 4 ) 
               
               
                 Results: 
               
             
          
           
               
                   
                 Cumu. H 2 SO 4   
                   
               
             
          
           
               
                   
                 19.5% 
                 Equiv. 
                   
                 Solid Assay 
                 Cyanide Balance 
               
             
          
           
               
                   
                 Sol. 
                 100% 
                 Solution Analysis 
                 Dry 
                   
                 In 
                 In 
                   
               
             
          
           
               
                 Time 
                 Added 
                 H 2 SO 4   
                 CN T   
                 CNS 
                 Cu 
                 Zn 
                 Wt. 
                 CN T   
                 S T   
                 Cu 
                 Zn 
                 Solution* 
                 Precip. 
                 Total 
               
               
                 min 
                 g 
                 g/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
                 % 
               
               
                   
               
               
                 Feed 
                   
                   
                 634 
                 339  
                 374 
                 37.8 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                  5 
               
               
                  5 
                 18.9 
                 3.7 
                 563 
                 23 
                 5.55 
                 38.0 
                   
                   
                   
                   
                   
                 90.5 
               
               
                 15 
                 18.9 
                 3.7 
                 602 
                 19 
                 8.65 
                 34.0 
                   
                   
                   
                   
                   
                 96.7 
               
               
                 30 
                 18.9 
                 3.7 
                 589 
                 17 
                 13.3 
                 36.5 
                   
                   
                   
                   
                   
                 94.7 
               
               
                 60 
                 18.9 
                 3.7 
                 595 
                 17 
                 195. 
                 37.0 
                 0.62 
                 0.89 
                 25.4 
                 54.6 
                 0.008 
                 95.6 
                 0.9 
                 96.5 
               
               
                   
               
               
                 *Taking into account volume changes  
               
               
                 NA: not analyzed  
               
               
                 Feed volume: 1 L  
               
               
                 AVR Recoverable CN in Feed: 481 mg/L  
               
               
                 CN Recovery: 606 mg/L feed or 126% AVR recoverable  
               
               
                 Notes:  
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4  = CN T    
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate  
               
             
          
           
               
                   
                 CN Balance 
               
             
          
           
               
                   
                 Ret. 
                 H 2 SO 4   
                 H 2 SO 4   
                 Solution Analysis 
                 Solids Assay 
                 in 
                   
               
             
          
           
               
                   
                   
                 Time 
                 Consu. 
                 Consu. 
                 CN(T) 
                 SCN 
                 Cu 
                 Zn 
                 Cu 
                 Wt. 
                 CN(T) 
                 S(T) 
                 Cu 
                 Zn 
                 Sol&#39;n 
                 in 
                 Total 
               
               
                 Test 
                 pH 
                 min 
                 g/L Sol. 
                 g/L Sol. 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g/L 
                 % 
                 % 
                 % 
                 % 
                 % 
                 Ppt. 
                 % 
               
               
                   
               
               
                 Feed 1 
                 ˜11 
                 — 
                 — 
                 — 
                 641 
                 315 
                 403 
                 29.2 
                 595 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 AFR-1 
                 3.0 
                  5 
                 2.0 
                 — 
                 484 
                 291 
                 36.0 
                 28.3 
                   
                   
                   
                   
                   
                   
                 77.0 
               
               
                   
                 3.0 
                 15 
                 2.1 
                 — 
                 477 
                 279 
                 34.0 
                 25.6 
                   
                   
                   
                   
                   
                   
                 76.0 
               
               
                   
                 3.0 
                 30 
                 2.2 
                 — 
                 515 
                 287 
                 34.6 
                 26.8 
                   
                   
                   
                   
                   
                   
                 82.1 
               
               
                   
                 3.0 
                 60 
                 2.2 
                 — 
                 475 
                 242 
                 39.3 
                 26.4 
                   
                 0.52 
                 13.4 
                 9.77 
                 NA 
                 NA 
                 75.7 
                 10.9 
                 86.6 
               
               
                 AFR-2 
                 2.0 
                  5 
                 2.9 
                 — 
                 475 
                 22 
                 3.13 
                 30.3 
                   
                   
                   
                   
                   
                   
                 76.3 
               
               
                   
                 2.0 
                 15 
                 3.0 
                 — 
                 461 
                 16 
                 5.99 
                 28.4 
                   
                   
                   
                   
                   
                   
                 74.1 
               
               
                   
                 2.0 
                 30 
                 3.0 
                 — 
                 574 
                 15 
                 12.1 
                 25.6 
                   
                   
                   
                   
                   
                   
                 92.3 
               
               
                   
                 2.0 
                 60 
                 3.0 
                 — 
                 477 
                 20 
                 21.1 
                 28.4 
                   
                 0.61 
                 0.59 
                 24.6 
                 NA 
                 NA 
                 76.6 
                 0.6 
                 77.2 
               
               
                 AFR-3 
                 2.0 
                  5 
                 — 
                 ND 
                 456 
                 38 
                 5.51 
                 25.5 
                   
                   
                   
                   
                   
                   
                 71.1 
               
               
                   
                 2.0 
                 15 
                 — 
                 ND 
                 456 
                   
                 4.03 
                 27.0 
                   
                   
                   
                   
                   
                   
                 71.1 
               
               
                   
                 2.0 
                 30 
                 — 
                 ND 
                 465 
                   
                 3.56 
                 26.3 
                   
                   
                   
                   
                   
                   
                 72.5 
               
               
                   
                 2.0 
                 60 
                 — 
                 ND 
                 452 
                   
                 3.74 
                 26.7 
                   
                 0.70 
                 1.54 
                 23.6 
                 NA 
                 NA 
                 74.7 
                 1.7 
                 76.4 
               
               
                   
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4   
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate = 476 mg/L Feed 1  
               
               
                 ND: not determined  
               
             
          
           
               
                   
                 CN Balance 
               
             
          
           
               
                   
                 Ret. 
                 H 2 SO 4   
                 H 2 SO 4   
                 Solution Analysis 
                 Solids Assay 
                 in 
                   
               
             
          
           
               
                   
                   
                 Time 
                 Consu. 
                 Consu. 
                 CN(T) 
                 SCN 
                 Cu 
                 Zn 
                 Ca 
                 Wt. 
                 CN(T) 
                 S(T) 
                 Cu 
                 Zn 
                 Sol&#39;n 
                 in 
                 Total 
               
               
                 Test 
                 pH 
                 min 
                 g/L Sol. 
                 g/L Sol. 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 mg/L 
                 g/L 
                 % 
                 % 
                 % 
                 % 
                 % 
                 Ppt. 
                 % 
               
               
                   
               
               
                 Feed 2 
                 ˜11 
                 — 
                 — 
                 — 
                 936 
                 401 
                 472 
                 42.9 
                 577 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 AFR-4 
                 2.0 
                  5 
                 3.1 
                 — 
                 806 
                 43 
                 5.78 
                 37.7 
                   
                   
                   
                   
                   
                   
                 87.5 
               
               
                   
                 2.0 
                 15 
                 3.1 
                 — 
                 806 
                 34 
                 7.17 
                 36.3 
                   
                   
                   
                   
                   
                   
                 87.5 
               
               
                   
                 2.0 
                 30 
                 3.1 
                 — 
                 835 
                 33 
                 8.96 
                 35.4 
                   
                   
                   
                   
                   
                   
                 90.6 
               
               
                   
                 2.0 
                 60 
                 3.1 
                 — 
                 814 
                 29 
                 12.0 
                 35.0 
                   
                 0.85 
                 2.77 
                 23.1 
                 51.6 
                 0.04 
                 88.4 
                 2.5 
                 90.9 
               
               
                 Feed 3 
                 ˜11 
                 — 
                 — 
                 — 
                 1060 
                 328 
                 500 
                 54.0 
                 540 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 AFR-5 
                 2.0 
                  5 
                 3.1 
                 — 
                 749 
                 83 
                 7.78 
                 41.0 
                   
                   
                   
                   
                   
                   
                 71.6 
               
               
                   
                 2.0 
                 15 
                 3.1 
                 — 
                 835 
                 65 
                 8.40 
                 39.0 
                   
                   
                   
                   
                   
                   
                 79.9 
               
               
                   
                 2.0 
                 30 
                 3.1 
                 — 
                 835 
                 61 
                 9.70 
                 41.0 
                   
                   
                   
                   
                   
                   
                 79.9 
               
               
                   
                 2.0 
                 60 
                 3.1 
                 — 
                 807 
                 50 
                 2.59 
                 41.0 
                   
                 0.90 
                 6.48 
                 18.2 
                 50.1 
                 0.03 
                 77.2 
                 5.5 
                 82.7 
               
               
                 Feed 4 
                 ˜11 
                 — 
                 — 
                 — 
                 1010 
                 308 
                 514 
                 39.3 
                 763 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 AFR-6 
                 2.0 
                  5 
                 2.9 
                 — 
                 890 
                 45 
                 6.78 
                 35.9 
                   
                   
                   
                   
                   
                   
                 89.4 
               
               
                   
                 2.0 
                 15 
                 2.9 
                 — 
                 845 
                 33 
                 7.50 
                 36.7 
                   
                   
                   
                   
                   
                   
                 84.9 
               
               
                   
                 2.0 
                 30 
                 2.9 
                 — 
                 845 
                 35 
                 9.62 
                 36.5 
                   
                   
                   
                   
                   
                   
                 84.9 
               
               
                   
                 2.0 
                 60 
                 2.9 
                 — 
                 850 
                 35 
                 18.5 
                 36.9 
                   
                 1.22 
                 4.26 
                 19.8 
                 35.8 
                 0.01 
                 85.4 
                 5.1 
                 90.6 
               
               
                 Feed 5 
                 ˜11 
                 — 
                 — 
                 — 
                 634 
                 339 
                 374 
                 37.8 
                 645 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 AFR-7 
                 1.5 
                  5 
                 3.7 
                 — 
                 563 
                 23 
                 5.55 
                 38.0 
                   
                   
                   
                   
                   
                   
                 90.5 
               
               
                   
                 1.5 
                 15 
                 3.7 
                 — 
                 602 
                 19 
                 8.65 
                 34.0 
                   
                   
                   
                   
                   
                   
                 96.7 
               
               
                   
                 1.5 
                 30 
                 3.7 
                 — 
                 589 
                 17 
                 13.3 
                 36.5 
                   
                   
                   
                   
                   
                   
                 94.7 
               
               
                   
                 1.5 
                 60 
                 3.7 
                 — 
                 595 
                 17 
                 19.5 
                 37.0 
                   
                 0.62 
                 0.89 
                 25.4 
                 54.6 
                 0.008 
                 95.6 
                 0.9 
                 96.5 
               
               
                   
               
               
                 CN WAD  = CN T  − CN in Fe(CN) 4   
               
               
                 AVR Recoverable CN = CN WAD    − CN in CuCN precipitate = 743 mg/L Feed 2, 855 mg/L Feed 3, 800 mg/L Feed 4, 481 mg/L Feed 5.  
               
             
          
         
       
     
     
       
         
               
               
             
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR-130 
                 Test TH-1 Operator: ME 
               
               
                   
               
               
                 Purpose: 
                 Scoping tests to select flocculant. 
               
               
                 Procedure: 
                 The feed solution prepared in Test AFR-4 was used to produce a 
               
               
                   
                 slurry for the scoping testwork. The feed solution 
               
               
                   
                 (800 mL) was adjusted to and maintained at pH 2 with 
               
               
                   
                 dilute sulphuric acid for 1 hour. 
               
               
                   
                 The slurry was used as feed for the scoping testwork. 
               
               
                   
                 Three types of flocculants were evaluated: 
               
               
                   
                 Cationic - low pH slurries, acid and aqueous leach metallurgical processes 
               
               
                   
                 Non-Ionic - general purpose 
               
               
                   
                 Anionic - under neutral and alkaline conditions 
               
               
                   
                 1) E-10 (anionic, very high molecular weight) 0.1% 
               
               
                   
                 2) P156 (anionic, high molecular weight) 0.1% 
               
               
                   
                 3) P352 (cationic, medium molecular weight) 0.1% 
               
               
                   
                 4) P351 (non-ionic, high molecular weight) 0.1% 
               
               
                   
                 5) Nil 
               
               
                   
                 Scoping test was carried out in a small beaker using 100 mL of feed. The feed 
               
               
                   
                 was stirred gently. Flocculant was gradually added and observations were made 
               
               
                   
                 concerning the settling rate and the clarity of the supernatant solution. 
               
               
                   
               
             
          
           
               
                 Results: 
               
             
          
           
               
                 Test/Time 
                   
                 Cumulative Dosage 
                 Floc 
                 Relative 
                 Supernatant 
               
             
          
           
               
                 min 
                 Flocculant 
                 Drops 
                 g/m 3   
                 Size 
                 Settling Rate 
                 Solution 
               
               
                   
               
               
                 Test 1-1 
                 E-10 
                 11 
                 1.98 
                 Medium 
                 Medium 
                 Cloudy 
               
               
                   
                   
                 16 
                 2.88 
                 Over flocc&#39;d 
                 Medium 
                 Sl. cloudy 
               
               
                 10 
                   
                   
                   
                   
                   
                 Sl. cloudy 
               
               
                 60 
                   
                   
                   
                   
                   
                 Clear 
               
               
                 Test 1-2 
                 P156 
                 12 
                 2.16 
                 Medium 
                 Medium 
                 Sl. cloudy 
               
               
                   
                   
                   
                 3.06 
                 Over flocc&#39;d 
                 Medium 
                 Sl. cloudy 
               
               
                 10 
                   
                   
                   
                   
                   
                 Very Sl. cloudy 
               
               
                   
                   
                   
                   
                   
                   
                 (&lt;E-10) 
               
               
                 60 
                   
                   
                   
                   
                   
                 Clear 
               
               
                 Test 1-3 
                 P352 
                 3 
                 0.54 
                 Medium 
                 Medium 
                 Cloudy 
               
               
                   
                   
                 6 
                 1.08 
                 Over flocc&#39;d 
                 Medium 
                 Sl. cloudy 
               
               
                 10 
                   
                   
                   
                   
                   
                 Very Sl. cloudy 
               
               
                 60 
                   
                   
                   
                   
                   
                 Clear 
               
               
                 Test 1-4 
                 P351 
                 1 
                 0.18 
                 Medium 
                 Medium 
                 Cloudy 
               
               
                   
                   
                 3 
                 0.54 
                 Over flocc&#39;d 
                 Medium 
                 Sl. cloudy 
               
               
                   
                   
                 6 
                 1.08 
                 Over flocc&#39;d 
                 Medium 
                 Sl. cloudy 
               
               
                 10 
                   
                   
                   
                   
                   
                 Very Sl. cloudy 
               
               
                 60 
                   
                   
                   
                   
                   
                 Clear 
               
               
                 Test 1-5 
                 Nil 
                   
                   
                 Small 
                 Slow 
                 Very cloudy 
               
               
                 10 
                   
                   
                   
                   
                   
                 Cloudy 
               
               
                 60 
                   
                   
                   
                   
                   
                 Sl. cloudy 
               
               
                   
               
               
                 P351 produced large floccs but the supernatant was clear, settling rate was good and required a lowest dosage.  
               
             
          
         
       
     
     
       
         
               
               
             
               
               
             
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project LR130 
                 Test Cu-L1 Operator: ME 
               
               
                   
               
               
                 Purpose: 
                 To prepare a batch of M41 resin loaded with Cu(CN) 4   3− . 
               
               
                 Procedure: 
                 The feed solution containing 5 g/L SCN, 20 g/L Cu and 
               
               
                   
                 32.8 g/L CN (CN:Cu mole ratio ˜4.0:1) 
               
               
                   
                 was prepared by dissolving 93.4 g NaCN (99%), 
               
               
                   
                 56.4 g CuCN and 16.7 g KSCN in deionized 
               
               
                   
                 water to 2 L. The solution was 
               
               
                   
                 adjusted to pH 11 with NaOH. 
               
               
                   
                 A 10 mL head sample was 
               
               
                   
                 submitted for analysis of CN, SCN and Cu. 
               
               
                   
                 Resin loading was carried out by contacting 
               
               
                   
                 500 mL of M41 resin (−20 mesh) in a bottle with 2 
               
               
                   
                 of feed solution for 24 hours. 
               
               
                   
                 Following loading, the resin was recovered and 
               
               
                   
                 washed with 3 × 500 mL of DIW. The barren 
               
               
                   
                 solution was assayed for CN T , SCN and Cu. 
               
               
                 Resin: 
                 500 mL M41 fresh resin (−20 mesh) 
               
               
                 Feed Solution: 
                 2 L containing 5 g/L SCN, 20 g/L Cu and 32.8 g/L CN 
               
               
                   
                 (CN:Cu mole ratio ˜4.0:1) 
               
               
                 Temperature: 
                 ˜20° C. 
               
               
                 Method: 
                 Bottle on roller 
               
               
                   
               
             
          
           
               
                   
                 Concentration (mg/L, %) 
               
             
          
           
               
                   
                 Volume 
                 Mass 
                   
                   
                 CN:Cu 
                   
               
               
                 Increment 
                 mL 
                 g 
                 CN 
                 Cu 
                 M/M 
                 SCN 
               
               
                   
               
               
                 Feed resin* 
                 500 
               
               
                 Feed solution 
                 2000 
                   
                 32800 
                 19000 
                 4.2 
                 4760 
               
               
                 Barren solution 
                 2100 
                   
                 19800 
                 11800 
                 4.1 
                 1650 
               
               
                 Loaded resin calc. 
                 437 
                 145 
                 16.5 
                 9.10 
                 4.4 
                 4.17 
               
               
                 Loaded resin assay 
                 437 
                 145 
                 13.2 
                 8.62 
                 3.7 
                 2.79 
               
               
                   
               
               
                 *Wet settled resin containing some water  
               
             
          
         
       
     
     EXAMPLE 2 
     
       
         
               
               
             
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project 4424-116 
                 Test IX- 3A to C 
               
               
                   
               
               
                 Purpose: 
                 To conduct resin loading tests using stripped resin from Test IX- 3 
               
               
                 Procedure: 
                 A synthetic solution (Feed IX-7) containing approximately 
               
               
                   
                 110 mg/L Cu 
               
               
                   
                 60 mg/L Zn 
               
               
                   
                 410 mg/L CN 
               
               
                   
                 300 mg/L SCN 
               
               
                   
                 9.1 CN:Cu mole ratio 
               
               
                   
                 was prepared for the teswork by dissolving NaCN, 
               
               
                   
                 CuCN and KSCN in deionized water. 
               
               
                   
                 Resin adsorption was carried our by contacting 
               
               
                   
                 the stripped resin with the solution, 
               
               
                   
                 at three solution-to-resin ratios, in a bottle placed on 
               
               
                   
                 a roller for 24 hours. The solution 
               
               
                   
                 was maintained at approximately pH 10.5 during loading. 
               
               
                   
                 The resin was recovered and washed with water. 
               
               
                   
                 The resin was analyzed for Cu (by XRF), 
               
               
                   
                 S T  and CN T . 
               
               
                   
                 A sample of the barren solution was analyzed 
               
               
                   
                 for Cu, Zn, SCN and CN T . 
               
               
                 Loading Solution: 
                 Feed IX-7 solution 
               
               
                 Resin: 
                 Stripped resin from Test IX- 3 
               
               
                 Temperature 
                 Ambient 
               
               
                 pH: 
                 10.5-11 with NaOH 
               
               
                 Method: 
                 Bottle on roller 
               
               
                   
               
             
          
           
               
                   
                 Analysis (mg/L. %) 
               
             
          
           
               
                   
                 Volume 
                   
                   
                   
                 CN:Cu 
                   
                   
                 SCN cal. 
               
               
                 Test 
                 mL 
                 CN(T) 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 from S 
               
               
                   
               
               
                 IX-3A 
               
               
                 Feed Solution 
                 1465 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 1465 
                 85.0 
                 2.59 
                 18.4 
                 11 
                 NA 
                 421 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 1.10 
                 0.00 
                 2.72 
                 1.0 
                 3.88 
                 7.03 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.8 
                 11.9 
                 1.85 
                 5.67 
                 3.8 
                 NA 
                 2.53 
                 — 
               
               
                 Loaded Resin (assay) 
                 12.8 
                 10.7 
                 2.35 
                 6.30 
                 2.7 
                 1.33 
                 NA 
                 2.41 
               
               
                 IX-3B 
               
               
                 Feed Solution 
                 1950 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 1950 
                 143 
                 4.92 
                 35.0 
                 9.4 
                 NA 
                 405 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 1.10 
                 0.00 
                 2.72 
                 1.0 
                 3.88 
                 7.03 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.8 
                 12.8 
                 2.34 
                 5.91 
                 3.8 
                 NA 
                 1.78 
                 — 
               
               
                 Loaded Resin (assay) 
                 12.3 
                 10.6 
                 2.72 
                 6.23 
                 2.5 
                 0.88 
                 NA 
                 1.60 
               
               
                 IX-3C 
               
               
                 Feed Solution 
                 2440 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 2440 
                 126 
                 8.79 
                 51.0 
                 5.4 
                 NA 
                 399 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 1.10 
                 0.00 
                 2.72 
                 1.0 
                 3.88 
                 7.03 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.8 
                 16.4 
                 2.66 
                 5.81 
                 5.1 
                 NA 
                 0.90 
                 — 
               
               
                 Loaded Resin (assay) 
                 12.8 
                 10.4 
                 3.04 
                 5.78 
                 2.4 
                 2.32 
                 NA 
                 4.21 
               
               
                   
               
             
          
           
               
                 Resin for CN analysis 
                 A 
                 2.1 mL 
                 analysis 
                 80.70 mg CN 
                 38.43 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                 weight 
                 2.87 g 
                 0.36 g/mL 
               
               
                 Resin for CN analysis 
                 B 
                 2.1 mL 
                 analysis 
                 77.00 mg CN 
                 38.50 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                 weight 
                 2.90 g 
                 0.36 g/mL 
               
               
                 Resin for CN analysis 
                 C 
                 2.1 mL 
                 analysis 
                 77.00 mg CN 
                 38.50 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                 weight 
                 2.96 g 
                 0.37 g/mL 
               
               
                   
               
               
                 NA: not analyzed  
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 4424-116 Test IX-4A to C 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 To conduct resin loading tests using stripped resin from Test IX-4 
               
               
                 Procedure: 
                 The synthetic solution (Feed IX-7) containing approximately 
               
               
                   
                 110 mg/L Cu 
               
               
                   
                  60 mg/L Zn 
               
               
                   
                 410 mg/L CN 
               
               
                   
                 300 mg/L SCN 
               
               
                   
                  9.1 CN:Cu mole ratio 
               
               
                   
                 prepared in Test 3A-C was used in this test. 
               
               
                   
                 Resin adsorption was carried out by contacting the stripped resin with 
               
               
                   
                 the solution, at three solution-to-resin ratios, in a bottle placed on a 
               
               
                   
                 roller for 24 hours. The solution was maintained at approximately pH 
               
               
                   
                 10.5 during loading. The resin was recovered and washed with water. 
               
               
                   
                 The resin was analyzed for Cu (by XRF), S T  and CN T . 
               
               
                   
                 A sample of the barren solution was analyzed for Cu, Zn, SCN and CN T . 
               
               
                 Loading Solution: 
                 Feed IX-7 solution 
               
               
                 Resin: 
                 Stripped resin from Test IX-4 
               
               
                 Temperature: 
                 Ambient 
               
               
                 pH: 
                 10.5-11 with NaOH 
               
               
                 Method: 
                 Bottle on roller 
               
             
          
           
               
                   
                 Analysis (mg/L. %) 
               
             
          
           
               
                   
                 Volume 
                   
                   
                   
                 CN:Cu 
                   
                   
                 SCN cal. 
               
               
                 Test 
                 mL 
                 CN(T) 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 from S 
               
               
                   
               
               
                 IX-4A 
               
               
                 Feed Solution 
                 1465 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 1465 
                 64.0 
                 7.40 
                 25.9 
                 4.9 
                 NA 
                 345 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 1.80 
                 0.00 
                 4.36 
                 1.0 
                 2.76 
                 5.00 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.8 
                 12.9 
                 1.65 
                 7.01 
                 3.6 
                 NA 
                 2.98 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.8 
                 6.61 
                 1.72 
                 6.70 
                 1.4 
                 2.13 
                 NA 
                 3.86 
               
               
                 IX-4B 
               
               
                 Feed Solution 
                 1950 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 1950 
                 136 
                 8.41 
                 49.3 
                 6.1 
                 NA 
                 325 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 1.80 
                 0.00 
                 4.36 
                 1.0 
                 2.76 
                 5.00 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.8 
                 13.6 
                 2.14 
                 6.90 
                 3.6 
                 NA 
                 3.15 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.8 
                 7.70 
                 2.27 
                 6.47 
                 1.5 
                 1.51 
                 NA 
                 2.74 
               
               
                 IX-4C 
               
               
                 Feed Solution 
                 2440 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 2440 
                 181 
                 11.7 
                 69.2 
                 5.7 
                 NA 
                 304 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 1.80 
                 0.00 
                 4.36 
                 1.0 
                 2.76 
                 5.00 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.8 
                 14.1 
                 2.49 
                 6.49 
                 3.8 
                 NA 
                 3.78 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.8 
                 7.22 
                 2.60 
                 6.19 
                 1.2 
                 1.26 
                 NA 
                 2.28 
               
               
                   
               
             
          
           
               
                 Resin for CN analysis 
                 A 
                 2.1 mL 
                   
                 analysis 
                 51 
                 mg CN 
                 24.29 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 2.94 
                 g 
                 0.37 
                 g/mL 
               
               
                 Resin for CN analysis 
                 B 
                 2.1 mL 
                   
                 analysis 
                 57 
                 mg CN 
                 28.50 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 2.96 
                 g 
                 0.37 
                 g/mL 
               
               
                 Resin for CN analysis 
                 C 
                 2.1 mL 
                   
                 analysis 
                 54 
                 mg CN 
                 27.00 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 2.99 
                 g 
                 0.37 
                 g/mL 
               
               
                   
               
               
                 NA: not analyzed  
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 4424-116 Test IX-5A to C 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 To conduct resin loading tests using stripped resin from Test IX-5 
               
               
                 Procedure: 
                 The synthetic solution (Feed IX-7) containing approximately 
               
               
                   
                 110 mg/L Cu 
               
               
                   
                 60 mg/L Zn 
               
               
                   
                 410 mg/L CN 
               
               
                   
                 300 mg/L SCN 
               
               
                   
                 9.1 CN:Cu mole ratio 
               
               
                   
                 prepared in Test 3A-C was used in this test. 
               
               
                   
                 Resin adsorption was carried out by contacting the stripped resin with 
               
               
                   
                 the solution, at three solution-to-resin ratios, in a bottle placed on a 
               
               
                   
                 roller for 24 hours. The solution was maintained at approximately pH 
               
               
                   
                 10.5 during loading. The resin was recovered and washed with water. 
               
               
                   
                 The resin was analyzed for Cu (by XRF), S T  and CN T . 
               
               
                   
                 A sample of the barren solution was analyzed for Cu, Zn, SCN and CN T . 
               
               
                 Loading Solution: 
                 Feed IX-7 solution 
               
               
                 Resin: 
                 Stripped resin from Test IX-5 
               
               
                 Temperature: 
                 Ambient 
               
               
                 pH: 
                 10.5-11 with NaOH 
               
               
                 Method: 
                 Bottle on roller 
               
             
          
           
               
                   
                 Analysis (mg/L. %) 
               
             
          
           
               
                   
                 Volume 
                   
                   
                   
                 CN:Cu 
                   
                   
                 SCN cal. 
               
               
                 Test 
                 mL 
                 CN(T) 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 from S 
               
               
                   
               
               
                 IX-5A 
               
               
                 Feed Solution 
                 1465 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 1465 
                 31.6 
                 2.66 
                 24.3 
                 2.8 
                 NA 
                 290 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 3.70 
                 0.00 
                 9.02 
                 1.0 
                 1.24 
                 2.25 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.6 
                 15.2 
                 1.70 
                 11.6 
                 2.6 
                 NA 
                 1.95 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.6 
                 8.67 
                 1.60 
                 11.2 
                 1.3 
                 2.10 
                 NA 
                 3.81 
               
               
                 IX-5B 
               
               
                 Feed Solution 
                 1950 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 1950 
                 160 
                 12.6 
                 104 
                 3.3 
                 NA 
                 354 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 3.70 
                 0.00 
                 9.02 
                 1.0 
                 1.24 
                 2.25 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.6 
                 14.1 
                 1.90 
                 9.30 
                 2.9 
                 NA 
                 −0.69 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.6 
                 10.1 
                 2.00 
                 9.87 
                 1.7 
                 1.01 
                 NA 
                 1.83 
               
               
                 IX-5C 
               
               
                 Feed Solution 
                 2440 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 2440 
                 202 
                 24.9 
                 112 
                 3.5 
                 NA 
                 284 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 3.70 
                 0.00 
                 9.02 
                 1.0 
                 1.24 
                 2.25 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.6 
                 14.8 
                 1.80 
                 8.97 
                 3.3 
                 NA 
                 2.05 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.6 
                 6.78 
                 2.02 
                 9.00 
                 1.0 
                 0.83 
                 NA 
                 1.50 
               
               
                   
               
             
          
           
               
                 Resin for CN analysis 
                 A 
                 2.1 mL 
                   
                 analysis 
                 71.9 
                 mg CN 
                 34.24 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 3.16 
                 g 
                 0.40 
                 g/mL 
               
               
                 Resin for CN analysis 
                 B 
                 2.1 mL 
                   
                 analysis 
                 78.5 
                 mg CN 
                 39.25 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 3.12 
                 g 
                 0.39 
                 g/mL 
               
               
                 Resin for CN analysis 
                 C 
                 2.1 mL 
                   
                 analysis 
                 52 
                 mg CN 
                 26.00 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 3.07 
                 g 
                 0.38 
                 g/mL 
               
               
                   
               
               
                 NA: not analyzed  
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 4424-116 Test IX-6A to C 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 To conduct resin loading tests using stripped resin from Test IX-6 
               
               
                 Procedure: 
                 The synthetic solution (Feed IX-7) containing approximately 
               
               
                   
                 110 mg/L Cu 
               
               
                   
                 60 mg/L Zn 
               
               
                   
                 410 mg/L CN 
               
               
                   
                 300 mg/L SCN 
               
               
                   
                 9.1 CN:Cu mole ratio 
               
               
                   
                 prepared in Test 3A-C was used in this test. 
               
               
                   
                 Resin adsorption was carried out by contacting the stripped resin with 
               
               
                   
                 the solution, at three solution-to-resin ratios, in a bottle placed on a 
               
               
                   
                 roller for 24 hours. The solution was maintained at approximately pH 
               
               
                   
                 10.5 during loading. The resin was recovered and washed with water. 
               
               
                   
                 The resin was analyzed for Cu (by XRF), S T  and CN T . 
               
               
                   
                 A sample of the barren solution was analyzed for Cu, Zn, SCN and CN T . 
               
               
                 Loading Solution: 
                 Feed IX-7 solution 
               
               
                 Resin: 
                 Stripped resin from Test IX-6 
               
               
                 Temperature: 
                 Ambient 
               
               
                 pH: 
                 10.5-11 with NaOH 
               
               
                 Method: 
                 Bottle on roller 
               
             
          
           
               
                   
                 Analysis (mg/L. %) 
               
             
          
           
               
                   
                 Volume 
                   
                   
                   
                 CN:Cu 
                   
                   
                 SCN cal. 
               
               
                 Test 
                 mL 
                 CN(T) 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 from S 
               
               
                   
               
               
                 IX-6A 
               
               
                 Feed Solution 
                 1465 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 1465 
                 112 
                 2.20 
                 94.0 
                 2.8 
                 NA 
                 312 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 5.80 
                 0.00 
                 14.2 
                 1.0 
                 1.4  
                 5.00 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.8 
                 14.1 
                 1.56 
                 14.7 
                 1.9 
                 NA 
                 4.15 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.8 
                 7.5 
                 1.05 
                 16.2 
                 0.9 
                 1.57 
                 NA 
                 2.85 
               
               
                 IX-6B 
               
               
                 Feed Solution 
                 1950 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 1950 
                 177 
                 10.2 
                 142 
                 2.8 
                 NA 
                 313 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 5.80 
                 0.00 
                 14.2 
                 1.0 
                 NA 
                 5.00 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.9 
                 14.5 
                 1.79 
                 13.1 
                 2.2 
                 NA 
                 3.82 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.9 
                 8.6 
                 1.64 
                 15.0 
                 1.0 
                 0.92 
                 NA 
                 1.67 
               
               
                 IX-6C 
               
               
                 Feed Solution 
                 2440 
                 422 
                 60.5 
                 111 
                 7.2 
                 NA 
                 280 
                 — 
               
               
                 Barren Solution 
                 2440 
                 154 
                 6.21 
                 118 
                 3.0 
                 NA 
                 310 
                 — 
               
               
                 Feed Resin 
                 13.0 
                 5.80 
                 0.00 
                 14.2 
                 1.0 
                 NA 
                 5.00 
                 — 
               
               
                 Loaded Resin (cal.) 
                 12.9 
                 17.9 
                 2.46 
                 13.9 
                 2.5 
                 NA 
                 3.64 
                 — 
               
               
                 Loaded Resin(assay) 
                 12.9 
                 9.34 
                 2.59 
                 15.0 
                 0.8 
                 1.15 
                 NA 
                 2.08 
               
               
                   
               
             
          
           
               
                 Resin for CN analysis 
                 A 
                 2.1 mL 
                   
                 analysis 
                 67.50 
                 mg CN 
                 32.14 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 3.43 
                 g 
                 0.43 
                 g/mL 
               
               
                 Resin for CN analysis 
                 B 
                 2.1 mL 
                   
                 analysis 
                 72.60 
                 mg CN 
                 36.30 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 3.39 
                 g 
                 0.42 
                 g/mL 
               
               
                 Resin for CN analysis 
                 C 
                 2.1 mL 
                   
                 analysis 
                 78 
                 mg CN 
                 39.00 
                 mg/mL 
               
               
                 Resin dried for Cu, S(T) 
                   
                 8 mL 
                   
                 weight 
                 3.34 
                 g 
                 0.42 
                 g/mL 
               
               
                   
               
               
                 NA: not analyzed  
               
             
          
         
       
     
     EXAMPLE 3 
     
       
         
               
             
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 05630-001 Test IX-2 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Batch regeneration at pH 1 pH 1.5 
               
               
                 Procedure: 
                 The resin (50 mL) was placed in a kettle equipped with a pH probe. 
               
               
                   
                 Deionized water (250 mL) was added. 
               
               
                   
                 Mixing was provided with an over head mixer. 
               
               
                   
                 The slurry was adjusted to pH 1.5 with dilute H2SO4 and maintained at this pH for 4 hours. 
               
               
                   
                 Samples of resin slurry were taken at 1, 2 and 4 hours. 
               
               
                   
                 The solution was analyzed for Cu. 
               
               
                   
                 The resin was assayed for CN and Cu. 
               
               
                   
                 After 6 hours, the resin was recovered for analysis of CN and Cu. 
               
               
                   
                 The solution was analyzed for Cu. 
               
               
                 Resin: 
                 50 mL “eluted” resin prepared in Test IX-1 
               
               
                 Strip Solution: 
                 250 mL deionized water plus approximately 25 mL water in resin bed 
               
               
                 pH: 
                 1.5 with H2SO4 20% 
               
               
                 Temperature: 
                 Ambient 
               
               
                 Method: 
                 Agitated kettle 
               
             
          
           
               
                   
                 Sol. 
                 Resin 
                 Resin 
                   
                 H2SO4 Added 
                 Solution Anal. 
                 Resin Analysis (mg/L, %) 
               
             
          
           
               
                   
                 Vol. 
                 Vol. 
                 Mass 
                   
                 20% w/w 
                 Cumu. 
                 CN(F) 
                 Cu 
                   
                   
                 CN:Cu 
                   
                   
               
               
                 Sample 
                 mL 
                 mL 
                 g 
                 pH 
                 g 
                 % Stoic* 
                 mg/L** 
                 mg/L 
                 CN 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
               
               
                   
               
               
                 Feed resin 
                   
                 50 
                 19.8 
                 — 
                 — 
                 — 
                 — 
                 — 
                 11.9 
                 13.0 
                 2.2 
                 1.97 
                 3.57 
               
               
                 Solution 
                 250 
                   
                   
                   
                   
                   
                 — 
                 — 
               
               
                 1-hour 
                   
                 14.8 
                 5.89 
                 1.5 
                 10.8 
                 88 
                 1940 
                 0.62 
                 7.16 
                 12.2 
                 1.4 
                 NA 
                 — 
               
               
                 2-hour 
                   
                 14.5 
                 5.79 
                 1.5 
                 0.10 
                 88 
                 1950 
                 0.52 
                 7.14 
                 12.3 
                 1.4 
                 NA 
                 — 
               
               
                 4-hour 
                   
                 14.8 
                 5.91 
                 1.5 
                   
                   
                 1770 
                 0.80 
                 7.14 
                 12.5 
                 1.4 
                 NA 
                 — 
               
               
                 6-hour 
                   
                 9.8 
                 3.89 
                 1.5 
                   
                   
                 1110 
                 1.23 
                 5.79 
                 12.4 
                 1.1 
                 NA 
                 — 
               
               
                 Total 
                   
                 53.9 
                 21.5 
               
               
                   
               
               
                 *Based on conversion of loaded copper cyanide to CuCN.  
               
               
                 **Excluded losses as HCN during test  
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                 1 h 
                 2 
                 mL 
                 57 
                 mg CN(T) 
                   
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 3.98 
                 g 
                 0.398 g/mL 
               
               
                   
                   
                 2 h 
                 2 
                 mL 
                 57 
                 mg CN(T) 
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 3.99 
                 g 
                 0.399 g/mL 
               
               
                   
                   
                 4 h 
                 2 
                 mL 
                 57 
                 mg CN(T) 
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 3.99 
                 g 
                 0.399 g/mL 
               
               
                   
                   
                 6 h 
                 2 
                 mL 
                 46 
                 mg CN(T) 
               
               
                   
                   
                   
                 7.7 
                 mL, wt: 
                 3.06 
                 g 
                 0.397 g/mL 
               
               
                   
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 05630-001 Test IX-3 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Batch regeneration of resin using 100% of the 
               
               
                   
                 stoichiometric requirement of H2SO4 for converting copper cyanide on resin to CuCN. 
               
               
                 Procedure: 
                 The resin (60 mL) was placed in a kettle equipped with a pH probe. 
               
               
                   
                 Deionized water (300 mL) was added. 
               
               
                   
                 Mixing was provided with an over head mixer. 
               
               
                   
                 Concentrated H2SO4 was added. 
               
               
                   
                 Samples of resin slurry were taken at 1, 2 and 4 hours. 
               
               
                   
                 The solution was analyzed for Cu. 
               
               
                   
                 The resin was assayed for CN and Cu. 
               
               
                   
                 After 6 hours, the resin was recovered for analysis of CN and Cu. 
               
               
                   
                 The solution was analyzed for Cu. 
               
               
                 Resin: 
                 60 mL “eluted” resin prepared in Test IX-1 
               
               
                 Strip Solution: 
                 300 mL deionized water plus approximately 30 mL water in resin bed 
               
               
                 H2SO4: 
                 3.35 g 96.5% or ˜100% of the stoic. requirement for converting copper cyanide to CuCN 
               
               
                 Temperature: 
                 Ambient 
               
               
                 Method: 
                 Agitated kettle 
               
             
          
           
               
                   
                 Sol. 
                 Resin 
                 Resin 
                   
                 H2SO4 Added 
                 Solution Anal. 
                 Resin Analysis (mg/L, %) 
               
             
          
           
               
                   
                 Vol. 
                 Vol. 
                 Mass 
                   
                 96.5% 
                 % 
                 CN(F) 
                 Cu 
                   
                   
                 CN:Cu 
                   
                   
               
               
                 Sample 
                 mL 
                 mL 
                 g 
                 pH 
                 g 
                 Stoic* 
                 mg/L** 
                 mg/L 
                 CN 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
               
               
                   
               
               
                 Feed resin 
                   
                 60 
                 23.8 
                 — 
                 0 
                 — 
                 — 
                 — 
                 11.9 
                 13.0 
                 2.2 
                 1.97 
                 3.57 
               
               
                 Solution 
                 300 
                   
                   
                   
                   
                   
                 — 
                 — 
               
               
                 1-hour 
                   
                 14.0 
                 5.60 
                   
                 3.35 
                 110 
                 1238 
                 1.05 
                 5.59 
                 12.0 
                 1.1 
                 NA 
                 — 
               
               
                 2-hour 
                   
                 14.0 
                 5.60 
                   
                   
                   
                 2211 
                 0.95 
                 6.89 
                 12.2 
                 1.4 
                 NA 
                 — 
               
               
                 4-hour 
                   
                 14.0 
                 5.60 
                   
                   
                   
                 1663 
                 1.74 
                 6.73 
                 11.9 
                 1.4 
                 NA 
                 — 
               
               
                 6-hour 
                   
                 22.6 
                 9.04 
                   
                   
                   
                 1220 
                 2.89 
                 5.69 
                 12.0 
                 1.2 
                 NA 
                 — 
               
               
                 Total 
                   
                 64.6 
                 25.8 
               
               
                   
               
               
                 *Based on conversion of loaded copper cyanide to CuCN.  
               
               
                 **Excluded losses as HCN during test  
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                 1 h 
                 2 
                 mL 
                 44.7 
                 mg CN(T) 
                   
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 4 
                 g 
                 0.400 g/mL 
               
               
                   
                   
                 2 h 
                 2.1 
                 mL 
                 57.9 
                 mg CN(T) 
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 4 
                 g 
                 0.400 g/mL 
               
               
                   
                   
                 4 h 
                 2.1 
                 mL 
                 56.5 
                 mg CN(T) 
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 4 
                 g 
                 0.400 g/mL 
               
               
                   
                   
                 6 h 
                 2 
                 mL 
                 45.5 
                 mg CN(T) 
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 4 
                 g 
                 0.400 g/mL 
               
               
                   
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 05630-001 Test IX-4 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Batch regeneration of resin using 200% of the 
               
               
                   
                 stoichiometric requirement of H2SO4 for converting copper cyanide on resin to CuCN. 
               
               
                 Procedure: 
                 The resin (60 mL) was placed in a kettle equipped with a pH probe. 
               
               
                   
                 Deionized water (300 mL) was added. 
               
               
                   
                 Mixing was provided with an over head mixer. 
               
               
                   
                 Concentrated H2SO4 was added. 
               
               
                   
                 Samples of resin slurry were taken at 1, 2 and 4 hours. 
               
               
                   
                 The solution was analyzed for Cu. 
               
               
                   
                 The resin was assayed for CN and Cu. 
               
               
                   
                 After 6 hours, the resin was recovered for analysis of CN and Cu. 
               
               
                   
                 The solution was analyzed for Cu. 
               
               
                 Resin: 
                 60 mL “eluted” resin prepared in Test IX-1 
               
               
                 Strip Solution: 
                 300 mL deionized water plus approximately 30 mL water in resin bed 
               
               
                 H2SO4: 
                 6.70 g 97% or ˜200% of the stoic. requirement for converting copper cyanide to CuCN 
               
               
                 Temperature: 
                 Ambient 
               
               
                 Method: 
                 Agitated kettle 
               
             
          
           
               
                   
                 Sol. 
                 Resin 
                 Resin 
                   
                 H2SO4 Added 
                 Solution Anal. 
                 Resin Analysis (mg/L, %) 
               
             
          
           
               
                   
                 Vol. 
                 Vol. 
                 Mass 
                   
                 96.5% 
                 % 
                 CN(F) 
                 Cu 
                   
                   
                 CN:Cu 
                   
                   
               
               
                 Sample 
                 mL 
                 mL 
                 g 
                 pH 
                 g 
                 Stoic* 
                 mg/L** 
                 mg/L 
                 CN 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
               
               
                   
               
               
                 Feed resin 
                   
                 60 
                 23.8 
                 — 
                 0 
                 — 
                 — 
                 — 
                 11.9 
                 13.0 
                 2.2 
                 1.97 
                 3.57 
               
               
                 Solution 
                 300 
                   
                   
                   
                   
                   
                 — 
                 — 
               
               
                 1-hour 
                   
                 14.0 
                 5.74 
                   
                 6.70 
                 220 
                 1256 
                 8.83 
                 6.44 
                 11.4 
                 1.4 
                 NA 
                 — 
               
               
                 2-hour 
                   
                 14.0 
                 5.74 
                   
                   
                   
                 2087 
                 13.6 
                 5.63 
                 11.4 
                 1.2 
                 NA 
                 — 
               
               
                 4-hour 
                   
                 14.0 
                 5.74 
                   
                   
                   
                 1397 
                 23.5 
                 5.41 
                 11.5 
                 1.1 
                 NA 
                 — 
               
               
                 6-hour 
                   
                 23.4 
                 9.59 
                   
                   
                   
                  637 
                 36.7 
                 4.70 
                 11.3 
                 1.0 
                 NA 
                 — 
               
               
                 Total 
                   
                 65.4 
                 26.8 
               
               
                   
               
               
                 *Based on conversion of loaded copper cyanide to CuCN.  
               
               
                 **Excluded losses as HCN during test  
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                 1 h 
                 2 
                 mL 
                 52.8 
                 mg CN(T) 
                   
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 4.1 
                 g 
                 0.410 g/mL 
               
               
                   
                   
                 2 h 
                 2 
                 mL 
                 46.2 
                 mg CN(T) 
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 4.1 
                 g 
                 0.410 g/mL 
               
               
                   
                   
                 4 h 
                 2 
                 mL 
                 44.4 
                 mg CN(T) 
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 4.1 
                 g 
                 0.410 g/mL 
               
               
                   
                   
                 6 h 
                 2 
                 mL 
                 38.5 
                 mg CN(T) 
               
               
                   
                   
                   
                 10 
                 mL, wt: 
                 4.1 
                 g 
                 0.410 g/mL 
               
               
                   
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
             
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 Project 05630-001 Test IX-5 
               
               
                   
               
             
          
           
               
                 Purpose: 
                 Continuous regeneration of the “eluted” resin prepared in Test IX-1 using 100% of the 
               
               
                   
                 stoichiometric requirement of H 2 SO 4  for converting copper cyanide on resin to CuCN. 
               
               
                 Procedure: 
               
               
                 1. 
                 Five 1-cm I.D. glass columns were labelled A, B, C, D and E. 
               
               
                 2. 
                 Each column was loaded with 20 mL of resin from Test IX-1. The water was drained. 
               
               
                 3. 
                 Three columns A, B and C were connected in series for regeneration. 
               
               
                 4. 
                 Deionized water (DIW) was pumped upflow through the circuit to adjust the flowrate to 
               
               
                   
                 0.67 mL/min (2 BV/h). The water was then drained from all columns. 
               
               
                 5. 
                 The regenerant for the first 2 hours was prepared by diluting 2.79 g H 2 SO 4  96.5% in DIW to 100 mL. 
               
               
                 6. 
                 A separate circuit was set up for washing of the regenerated resin column (one each time) 
               
               
                   
                 with DIW at 0.67 mL/min (2 BV/h). 
               
               
                 7. 
                 The regeneration pump was turned on to start the test. 
               
               
                 8. 
                 The acid solution after passing through the circuit was collected in a covered 50-mL grad cylinder. 
               
               
                   
                 The graduated cylinder contained some NaOH pellets to adjust the solution to pH &gt;11. 
               
               
                 9. 
                 At 1 h, the pump was turned off. The regenerate collected was placed in a cup (Regenerate A). 
               
               
                 10. 
                 Column A filled with acid solution was moved over to washing. 
               
               
                 11. 
                 DIW (40 mL) was passed up flow through Colunm A. The effluent was collected in a 50-mL 
               
               
                   
                 graduated cylinder. The cylinder was well covered to minimize loss of HCN. 
               
               
                 12. 
                 A new resin column (Column D) was added to the regeneration circuit (downstream of Column C). 
               
               
                 13. 
                 The acid solution was pumped to Column B to continue the regeneration. 
               
               
                   
                 The effluent was collected as in No. 8 above. 
               
               
                 14. 
                 At 2 h. the pump was turned off. The regenerate collected was placed in a cup (Regenerate B). 
               
               
                 15. 
                 1.12 g H 2 SO 4  96.5% was added to the 40 mL wash collected from washing of Column A. 
               
               
                   
                 This recycle solution was used for regeneration of Column C 
               
               
                 16. 
                 The water in Column A was drained into a cup containing some NaOH (Wash drain A). 
               
               
                 17. 
                 The resin was recovered. The volume was measured then saved in a cup (Resin A) 
               
               
                 18. 
                 Column B filled with acid solution was moved over to washing. 
               
               
                 19. 
                 DIW (40 mL) was passed up flow through Column B. The effluent was collected as in No. 11 above. 
               
               
                 20. 
                 A new resin column (Column E) was added to the regeneration circuit (downstream of Column D). 
               
               
                 21. 
                 The recycle solution from No. 15 was pumped through Column C to continue the regeneration. 
               
               
                 22. 
                 The empty column from No. 17 was filled with 20 mL of new resin and called Column F. 
               
               
                 23. 
                 The process continued for a total of 8 hours. The last three columns in the circuit were H, I and J. 
               
               
                 24. 
                 The solution in each column (H, I and J) was separately drained. The volume and pH were 
               
               
                   
                 measured. Each drain solution was adjusted to pH &gt;11 and analyzed for CN(T) and Cu. 
               
               
                 25. 
                 Each final circuit resin was washed with 80 mL water. The wash and drain were combined 
               
               
                   
                 and adjusted to pH &gt;11. The volume was measured and analyzed for Cu and CN(T). 
               
               
                 26. 
                 Each final resin was recovered. The volume was measured then saved in a cup (Resins H, I and J) 
               
               
                 27. 
                 The effluents from regeneration of Columns D and G, and from the drain solutions from washing of 
               
               
                   
                 Columns A, D and G were analyzed for CN(T) and Cu. 
               
               
                 Feed Resin: 
                 20 mL “eluted” resin prepared in Test IX-1 per coulmn 
               
               
                 No. of Columns 
                 3 connected in series in regeneration circuit 
               
               
                   
                 1 regenerated resin column in wash circuit 
               
               
                 H2SO4: 
                 1.12 96.5% or ˜100% stoic. requirement for converting copper cyanide to CuCN 
               
               
                   
                 The regenerants, 40 mL each (2 BV), were prepared in DIW for first two columns 
               
               
                   
                 A and B, and in effluents from washing of regenerated resin for Columns C to H. 
               
               
                 Retention Time: 
                 1 h for regeneration 
               
               
                   
                 1 h for washing of regenerated resin 
               
             
          
           
               
                   
                   
                 Drain 
                   
                 Drain from 
                   
                   
               
               
                   
                 Regeneration Effluent 
                 from Regen. Columns 
                 Effluent from Washing 
                 Washed Column 
                 Resin Analysis 
                   
               
             
          
           
               
                 Time 
                 Resin 
                 Vol. 
                   
                 CN T   
                 Cu 
                 Vol. 
                   
                 CN T   
                 Cu 
                 Vol. 
                   
                 CN T   
                 Cu 
                 Vol. 
                   
                 CN T   
                 Cu 
                 Vol. 
                 Wt. 
                 CN T   
                 Cu 
                 CN:Cu 
                 Resin assay 
               
             
          
           
               
                 h 
                 Column 
                 mL 
                 pH 
                 mg/L 
                 mg/L 
                 mL 
                 pH 
                 mg/L 
                 mg/L 
                 mL 
                 pH 
                 mg/L 
                 mg/L 
                 mL 
                 pH 
                 mg/L 
                 mg/L 
                 mL 
                 g 
                 % 
                 % 
                 M/M 
                 mL 
                 mg CN 
                 g/10 mL 
                 g/mL 
               
               
                   
               
               
                 0 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 20 
                 7.91 
                 11.9  
                 13.0 
                 2.2 
                   
                   
                   
                   
               
               
                 1 
                 A 
                  0 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 * 
                 — 
                 — 
                 — 
                 20 
                 — 
                 1250 
                 1.2 
                 21 
                 8.32 
                 6.49 
                 11.3 
                 1.4 
                 2 
                 52.4 
                 4.04 
                 0.40 
               
               
                 2 
                 B 
                 15 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 * 
                 — 
                 — 
                 — 
                 11 
                 — 
                 — 
                 — 
                 21 
                 — 
                 — 
                 — 
                 — 
               
               
                 3 
                 C 
                 21 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 * 
                 — 
                 — 
                 — 
                 14 
                 — 
                 — 
                 — 
                 21 
                 — 
                 — 
                 — 
                 — 
               
               
                 4 
                 D 
                 19 
                 — 
                 24.0  
                 1.2 
                 — 
                 — 
                 — 
                 — 
                 * 
                 — 
                 — 
                 — 
                 12 
                 — 
                  432 
                 3.6 
                 21 
                 8.63 
                 5.40 
                 11.3 
                 1.2 
                 2 
                 44.4 
                 4.11 
                 0.41 
               
               
                 5 
                 E 
                 21 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 * 
                 — 
                 — 
                 — 
                 13 
                 — 
                 — 
                 — 
                 21 
                 — 
                 — 
                 — 
                 — 
               
               
                 6 
                 F 
                 21 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
                 * 
                 — 
                 — 
                 — 
                 18 
                 — 
                 — 
                 — 
                 20 
                 — 
                 — 
                 — 
                 — 
               
               
                 7 
                 G 
                 19 
                 — 
                 3.5 
                 1.4 
                 — 
                 — 
                 — 
                 — 
                 40 
                 1.0 
                 14900 
                 3.1 
                 13 
                 — 
                  610 
                 3.0 
                 20 
                 8.38 
                 4.95 
                 11.2 
                 1.1 
                 2 
                 40.7 
                 4.11 
                 0.41 
               
               
                 8 
                 H 
                 20 
                 — 
                 4.7 
                 1.4 
                 12 
                 0.7 
                 14800 
                 3.5 
                 — 
                 — 
                 — 
                 — 
                  80{circumflex over ( )} 
                 2.0 
                 6400 
                 2.6 
                 20 
                 8.29 
                 4.22 
                 11.0 
                 0.9 
                 2 
                 34.5 
                 4.08 
                 0.41 
               
               
                 8 
                 I 
                 — 
                 — 
                 — 
                 — 
                 14 
                 3.9 
                 16100 
                 2.9 
                 — 
                 — 
                 — 
                 — 
                  80{circumflex over ( )} 
                 3.9 
                 7300 
                 0.6 
                 20 
                 7.83 
                 8.26 
                 12.2 
                 1.7 
                 2 
                 66 
                 4.00 
                 0.40 
               
               
                 8 
                 J 
                 — 
                 — 
                 — 
                 — 
                 10 
                 5.3 
                  3200 
                 2.4 
                 — 
                 — 
                 — 
                 — 
                  80{circumflex over ( )} 
                 5.6 
                  368 
                 0.5 
                 20 
                 7.77 
                 8.89 
                 12.3 
                 1.8 
                 2 
                 70.8 
                 3.98 
                 0.40 
               
               
                   
               
               
                 Feed resin: 20 mL, IX-1 resin, 3 columns connected in series, using ˜110% stoichiometric requirement of H 2 SO 4    
               
               
                 *H 2 SO 4  added to wash effluent before reuse in regenration of next column of resin.  
               
               
                 {circumflex over ( )}At 8 h, each resin column in circuit was washed with 80 mL deionized water. Wash and drain were combined.  
               
             
          
           
               
                 CN(F) Titration 
                 NO CN(F) found in Regen Effluents B, C, D, G. Analyze for CN(T) instead. 
               
               
                   
                 Wash collected from Column G had brown colour upon adjusting pH to &lt;11 
               
             
          
           
               
                   
                 Regenerate 
                 Wash/Drain Solution 
               
             
          
           
               
                 Time 
                 Resin 
                 Aliquot 
                 AgNO3 
                 CN(F) 
                   
                 Aliquot 
                 AgNO3 
                 CN(F) 
               
             
          
           
               
                 h 
                 Column 
                 mL 
                 Start 
                 End 
                 mg/L 
                 Type 
                 mL 
                 Start 
                 End 
                 mg/L 
               
               
                   
               
               
                 1 
                 A 
                   
                   
                   
                   
                 Drain 
               
               
                 2 
                 B 
                   
                   
                   
                   
                 Drain 
               
               
                 3 
                 C 
                   
                   
                   
                   
                 Drain 
               
               
                 4 
                 D 
                   
                   
                   
                   
                 Drain 
               
               
                 5 
                 E 
                   
                   
                   
                   
                 Drain 
               
               
                 6 
                 F 
                   
                   
                   
                   
                 Drain 
               
               
                 7 
                 G 
                   
                   
                   
                   
                 Drain 
               
               
                   
                 G 
                   
                   
                   
                   
                 Wash 
               
               
                 8 
                 H 
                   
                   
                   
                   
                 W + D 
               
               
                   
                 I 
                   
                   
                   
                   
                 W + D 
               
               
                   
                 J 
                   
                   
                   
                   
                 W + D 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
               
             
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 05630-001 Test IX-6 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Bulk batch regeneration of resin using ˜100% of the 
               
               
                   
                 stoichiometric requirement of H2SO4 for converting copper cyanide on resin to CuCN. 
               
               
                 Procedure: 
                 The resin (400 mL, excess water removed) was placed in a kettle equipped with a pH probe. 
               
               
                   
                 Deionized water (1 L) was added. 
               
               
                   
                 Mixing was provided with air drawn by vacuum through 2 scrubbers connected in series. 
               
               
                   
                 Concentrated H2SO4 was added. The pH was recorded hourly. 
               
               
                   
                 Samples of resin slurry were taken at 8 and 24 hours. 
               
               
                   
                 The solution was adjusted to pH &gt;11 analyzed for CN(F) and Cu. 
               
               
                   
                 The resin was assayed for CN and Cu (by XRF). 
               
               
                   
                 The solutions from the 2 scrubbers were titrate for CN(F) at 8 and 24 hours. 
               
               
                   
                 After the test, the resin was recovered, washed and the volume measured. 
               
               
                 Resin: 
                 400 mL “eluted” resin prepared in Test IX-1 (the remainder ˜100 mL was saved) 
               
               
                 Strip Solution: 
                 1000 mL deionized water plus approximately 200 mL water in resin bed 
               
               
                 H2SO4 
                 22.3 g 96.5% or 110% the stoic. requirement for converting copper cyanide to CuCN 
               
               
                 Temperature: 
                 Ambient 
               
               
                 Method: 
                 Air-agitated kettle 
               
               
                 Air flowrate: 
                 ˜8 L/min 
               
               
                 Scrubbers: 
                 2 × 2 L, each contained 1 L of 5% NaOH 
               
             
          
           
               
                   
                 Resin 
                 Resin 
                   
                 Acid Solution 
                 CN Scrubber 
                 Resin Calculated 
                 Resin Analysis (%) 
               
             
          
           
               
                   
                 Sol&#39;n 
                 Mass 
                   
                 CN(F) 
                 Cu 
                 #1 
                 #2 
                 CN 
                 Cu 
                 CN:Cu 
                   
                   
                 CN:Cu 
                   
               
               
                 Sample 
                 mL 
                 g 
                 pH 
                 mg/L 
                 mg/L 
                 mg 
                 mg 
                 % 
                 % 
                 M/M 
                 CN 
                 Cu 
                 M/M 
                 S(T) 
               
               
                   
               
               
                 Feed Resin 
                 400 
                 158 
                   
                   
                   
                   
                   
                   
                   
                   
                 11.9 
                 13.0 
                 2.2 
                 1.97 
               
               
                 Solution 
                 1200  
                   
                 0.9 
               
               
                 1-hour 
                   
                   
                 1.4 
               
               
                 2-hour 
                   
                   
                 1.6 
               
               
                 3-hour 
                   
                   
                 1.6 
               
               
                 4-hour 
                   
                   
                 1.7 
               
               
                 5-hour 
                   
                   
                 1.7 
               
               
                 6-hour 
                   
                   
                 1.7 
               
               
                 7-hour 
                   
                   
                 1.7 
               
               
                 8-hour 
                  14 
                 5.7 
                 1.8 
                 159 
                 51.4 
                 7641 
                 223 
                 6.15 
                 11.7 
                 1.3 
                 4.32 
                 11.1 
                 1.0 
                 NA 
               
               
                 24-hour 
                 415 
                 170 
                 1.9 
                 53 
                 257 
                 8224 
                 271 
                 5.86 
                 11.6 
                 1.2 
                 5.33 
                 11.0 
                 1.2 
                 NA 
               
               
                 Total 
                 429 
                 175 
               
               
                   
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                  8 h 
                  2 mL 
                 35.2 mg CN(T) 
                   
               
               
                   
                   
                   
                 10 mL, wt: 
                 4.07 g 
                 0.407 g/mL 
               
               
                   
                   
                 24 h 
                  2 mL 
                 43.6 mg CN(T) 
               
               
                   
                   
                   
                 10 mL, wt: 
                 4.09 g 
                 0.409 g/mL 
               
               
                   
                   
               
             
          
           
               
                 Titrations 
               
             
          
           
               
                   
                   
                 10 ml 
                   
                 50 ml 
                   
                 10 ml 
               
               
                   
                   
               
               
                   
                 scr 1 
                 28.8 ml of AgNO3 at 8 hr 
                 scr 2 
                 4.2 ml of AgNO3 at 8 hr 
                 acid 
                 0.60 ml of AgNO3 at 8 
               
               
                   
                   
                 31 ml of AgNO3 at 24 hr 
                   
                 5.1 ml of AgNO3 at 24 hr 
                   
                 0.20 ml of AgNO3 at 2 
               
               
                   
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 05630-001 Test IX-7 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Loading 
                   
               
               
                 Isotherm 
               
               
                 Purpose: 
                 Loading isotherm using regenerated IX-6 resin with pulp 
               
               
                   
                 from operating plant. 
               
               
                 Procedure: 
                 The feed resin was the regenerated resin 
               
               
                   
                 from Test IX-6. 
               
               
                   
                 Sufficient amounts of the plant solution and filter cake were removed from 
               
               
                   
                 the freezer for thawing. 
               
               
                   
                 The pulp was prepared by recombining the solution and the filter 
               
               
                   
                 cake at the ratio of 
               
               
                   
                 1500 mL solution to 1270 g wet solids. (1270 g wet solids 
               
               
                   
                 contained 250 mL solution.) 
               
               
                   
                 NaCN at 0.75 g/L solution basis was added to raise the CN:Cu mole ration from 
               
               
                   
                 approx. 2.6:1 to ˜4:1. 
               
               
                   
                 Resin loading was carried out by contacting the resin with the pulp at 
               
               
                   
                 various solution-to-resin ratio, 
               
               
                   
                 in a bottle placed on a roller 
               
               
                   
                 overnight. 
               
               
                   
                 The pulp was adjusted to pH 10.5-11 with 
               
               
                   
                 lime. 
               
               
                   
                 Following loading, the loaded resin was 
               
               
                   
                 recovered. 
               
               
                   
                 A loaded resin sample (10 mL) was submitted for analysis of Au, 
               
               
                   
                 Cu (by XRF), and CN T . 
               
               
                   
                 A solution sample was submitted for analysis of CN T , 
               
               
                   
                 SCN, Au and Cu. 
               
               
                 Feed: 
                 Reconstituted pulp (1500 mL solution to 1270 g 
               
               
                   
                 wet filter cake) 
               
               
                   
                 The pulp contained 1750 mL solution per 
               
               
                   
                 1020 g solids. 
               
               
                   
                 NaCN at 0.75 g/L solution basis was added to raise CN:Cu mole ratio from 
               
               
                   
                 ˜2.6:1 to ˜4:1. 
               
             
          
           
               
                 Resin: 
                 IX-6 containing 11% Cu, 5.33% CN. 
                 Method: 
                 Bottle on roller. 
               
             
          
           
               
                   
                   
                   
                   
                   
                 Resin Calculated (%, 
               
               
                   
                   
                   
                 Solution 
                 Analysis (mg/L, %, g/t) 
                 g/t) 
               
             
          
           
               
                   
                 Volume 
                 Mass 
                 to Resin 
                   
                   
                 CN:Cu 
                   
                   
                   
                   
                 CN:Cu 
                   
                   
               
               
                 Test/Product 
                 mL 
                 g 
                 Ratio 
                 CN 
                 Cu 
                 M/M 
                 Au 
                 SCN 
                 CN 
                 Cu 
                 M/M 
                 Au 
                 SCN 
               
               
                   
               
               
                 7A 
               
               
                 Feed resin 
                 23 
                 9.4 
                 17.4 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
               
               
                 Solution 
                 400 
                   
                   
                 ### 
                 644 
                 4.1 
                 0.28 
                 640 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Barren 
                 400 
                   
                   
                 9.8  
                 10.4 
                 2.3 
                 0.06 
                 400 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Loaded resin 
                 21.5 
                 9.0 
                   
                   
                 14.2 
                 0.0 
                   
                 NA 
                 10.1 
                 13.8 
                 1.8 
                 9.7 
                 4.63 
               
               
                 7B 
               
               
                 Feed resin 
                 16 
                 6.5 
                 25.0 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
               
               
                   
               
             
          
         
       
     
     EXAMPLE 4 
     
       
         
               
             
               
             
               
               
             
               
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                   
               
               
                 Project 05630-001 Test IX-7 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Loading Isotherm 
               
             
          
           
               
                 Purpose: 
                 Loading isotherm using regenerated IX-6 resin with pulp from operating plant. 
               
               
                 Procedure: 
                 The feed resin was the regenerated resin from Test IX-6. 
               
               
                   
                 Sufficient amounts of the plant solution and filter cake were removed from the freezer for thawing. 
               
               
                   
                 The pulp was prepared by recombining the solution and the filter cake at the ratio of 
               
               
                   
                 1500 mL solution to 1270 g wet solids. (1270 g wet solids contained 250 mL solution.) 
               
               
                   
                 NaCN at 0.75 g/L solution basis was added to raise the CN:Cu mole ration from approx. 2.6:1 to ˜4:1. 
               
               
                   
                 Resin loading was carried out by contacting the resin with the pulp at various solution-to-resin ratio, 
               
               
                   
                 in a bottle placed on a roller overnight. 
               
               
                   
                 The pulp was adjusted to pH 10.5-11 with lime. 
               
               
                   
                 Following loading, the loaded resin was recovered. 
               
               
                   
                 A loaded resin sample (10 mL) was submitted for analysis of Au, Cu (by XRF), and CN T . 
               
               
                   
                 A solution sample was submitted for analysis of CN T , SCN, Au and Cu. 
               
               
                 Feed: 
                 Reconstituted pulp (1500 mL solution to 1270 g wet filter cake) 
               
               
                   
                 The pulp contained 1750 mL solution per 1020 g solids. 
               
               
                   
                 NaCN at 0.75 g/L solution basis was added to raise CN:Cu mole ratio from ˜2.6:1 to ˜4:1. 
               
             
          
           
               
                 Resin: 
                 IX-6 containing 11% Cu, 5.33% CN. 
                 Method: 
                 Bottle on roller. 
               
             
          
           
               
                   
                   
                   
                 Solution 
                 Analysis (mg/L, %, g/t) 
                 Resin Calculated (%, g/t) 
               
             
          
           
               
                   
                 Volume 
                 Mass 
                 to Resin 
                   
                   
                 CN:Cu 
                   
                   
                   
                   
                 CN:Cu 
                   
                   
               
               
                 Test/Product 
                 mL 
                 g 
                 Ratio 
                 CN 
                 Cu 
                 M/M 
                 Au 
                 SCN 
                 CN 
                 Cu 
                 M/M 
                 Au 
                 SCN 
               
               
                   
               
               
                 7A 
               
               
                 Feed resin 
                 23 
                 9.4 
                 17.4 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
               
               
                 Solution 
                 400 
                   
                   
                 1083* 
                 644 
                 4.1 
                 0.28 
                 640 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Barren 
                 400 
                   
                   
                 9.8 
                 10.4 
                 2.3 
                 0.06 
                 400 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Loaded resin 
                 21.5 
                 9.0 
                   
                   
                 14.2 
                 0.0 
                   
                 NA 
                 10.1 
                 13.8 
                 1.8 
                 9.7 
                 4.63 
               
               
                 7B 
               
               
                 Feed resin 
                 16 
                 6.5 
                 25.0 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
               
               
                 Solution 
                 400 
                   
                   
                 1083 
                 644 
                 4.1 
                 0.28 
                 640 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Barren 
                 400 
                   
                   
                 76 
                 66.9 
                 2.8 
                 0.04 
                 640 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Loaded resin 
                 15 
                 6.3 
                   
                   
                 15.1 
                 0.0 
                   
                 NA 
                 11.7 
                 14.7 
                 2.0 
                 15.2  
                 3.57 
               
               
                 7C 
               
               
                 Feed resin 
                 14 
                 5.7 
                 33.6 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
               
               
                 Solution 
                 470 
                   
                   
                 1083 
                 644 
                 4.1 
                 0.28 
                 640 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Barren 
                 470 
                   
                   
                 282 
                 220 
                 3.1 
                 0.05 
                 780 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Loaded resin 
                 12.9 
                 5.3 
                   
                   
                 15.2 
                 0.0 
                   
                 NA 
                 12.4 
                 14.7 
                 2.1 
                 20.3  
                 2.33 
               
               
                 7D 
               
               
                 Feed resin 
                 14 
                 5.7 
                 40.0 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
               
               
                 Solution 
                 560 
                   
                   
                 1083 
                 644 
                 4.1 
                 0.28 
                 640 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Barren 
                 560 
                   
                   
                 384 
                 310 
                 3.0 
                 0.04 
                 810 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Loaded resin 
                 13 
                 5.3 
                   
                   
                 14.8 
                 0.0 
                   
                 NA 
                 12.7 
                 14.5 
                 2.1 
                 25.2  
                 1.79 
               
               
                 7E 
               
               
                 Feed resin 
                 14 
                 5.7 
                 50.0 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
                 5.33 
                 11.0 
                 1.2 
                 0.0 
                 3.57 
               
               
                 Solution 
                 700 
                   
                   
                 1083 
                 644 
                 4.1 
                 0.28 
                 640 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Barren 
                 700 
                   
                   
                 520 
                 450 
                 2.8 
                 0.09 
                 790 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Loaded resin 
                 13 
                 5.3 
                   
                   
                 14.0 
                 0.0 
                   
                 NA 
                 12.7 
                 13.5 
                 2.3 
                 25.0  
                 1.60 
               
               
                   
               
               
                 NA: not analyzed  
               
               
                 *Estimated, analysis pending.  
               
             
          
           
               
                   
                 Loaded Resin 
                 2 mL 
                 mg CN(T) 
                   
               
             
          
           
               
                   
                 A 
                 10 mL, wt: 
                 4.2 g 
                 0.42 g/mL 
               
             
          
           
               
                   
                 Loaded Resin 
                 2 mL 
                 mg CN(T) 
                   
               
             
          
           
               
                   
                 B 
                 10 mL, wt: 
                 4.2 g 
                 0.42 g/mL 
               
             
          
           
               
                   
                 Loaded Resin 
                 2 mL 
                 mg CN(T) 
                   
               
             
          
           
               
                   
                 C 
                 10 mL, wt: 
                 4.13 g 
                 0.41 g/mL 
               
             
          
           
               
                   
                 Loaded Resin 
                 2 mL 
                 mg CN(T) 
                   
               
             
          
           
               
                   
                 D 
                 10 mL, wt: 
                 4.11 g 
                 0.41 g/mL 
               
             
          
           
               
                   
                 Loaded Resin 
                 2 mL 
                 mg CN(T) 
                   
               
             
          
           
               
                   
                 E 
                 10 mL, wt: 
                 4.1 g 
                 0.41 g/mL 
               
               
                   
                   
               
             
          
         
       
     
     EXAMPLE 5 
     
       
         
               
             
               
               
             
               
               
               
               
             
               
               
               
               
             
               
               
             
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 04116-001 Test IX-15 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Elution of copper from IX-6AR (˜13% Cu, ˜14% CN) resin using NaCN at 50% of the 
               
               
                   
                 requirement for removing Cu and at a solution-to-resin ratio of 5-to-1, in a bottle. 
               
               
                 Procedure: 
                 The feed resin was placed in a small bottle. Water was drained/decanted. 
               
               
                   
                 The eluant was prepared then added to the bottle. 
               
               
                   
                 The bottle was capped and rolled overnight. 
               
               
                   
                 The resin slurry was filtered by gravity on a cup. 
               
               
                   
                 The resin was washed slowly with ˜40 mL water. 
               
               
                   
                 The filtrate and the wash were combined for analysis of CN T  and Cu. 
               
               
                   
                 The eluted resin was submitted for analysis of Cu and Zn by XRF. 
               
             
          
           
               
                 Resin: 
                 IX-6AR containing ˜13% Cu (˜53 g/L Cu), ˜14% CN (57 g/L CN) 
                 Volume: 
                 10 mL 
               
               
                 Eluant: 
                 4.34 g/L CN 
                 Volume: 
                 50 mL 
               
               
                   
                 (0.43 g NaCN 95%) 
               
             
          
           
               
                 Temperature: 
                 20-25° C. 
                 Sol-to-Resin Ratio: 
                 5-to-1 
               
             
          
           
               
                 Method: 
                 Bottle on roller overnight 
               
             
          
           
               
                   
                 Analysis (mg/L, %) 
                   
                   
               
             
          
           
               
                   
                 Volume 
                 Mass 
                 CN 
                   
                   
                 CN:Cu 
                   
                   
                 Cal. Resin (%) 
                   
               
             
          
           
               
                 Sample 
                 mL 
                 g 
                 * 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 CN 
                 Cu 
                 SCN 
                 51.6 g/L Cu 
                 49.5 g/L CN 
               
               
                   
               
               
                 Feed resin 
                 10 
                 4.06 
                 12.2 
                 0.81 
                 12.7 
                 2.1 
                 2.85 
                   
                 12.2 
                 12.7 
                   
               
               
                 Eluant 
                 50 
                   
                 4335 
                   
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Effluate &amp; wash 
                 85 
                   
                 2800 
                 NA 
                 2060 
                 3.3 
                 NA 
                 — 
                 11.6 
                 8.05 
               
               
                 Eluted resin 
                 10 
               
               
                 Calc. 
                 10 
                 3.77 
                 11.6 
                   
                 8.05 
                 3.2 
                 — 
                 — 
               
               
                 Assay 
                 10 
                 3.77 
                 11.2 
                 0.78 
                 9.87 
                 2.5 
                 NA 
                 — 
               
               
                   
               
               
                 *Feed resin being reassayed for CN(T)  
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                 2 mL 
                 84 
                 mg CN(T) 
                   
                 10 
                 mL resin 
                 4.06 
                 g 
               
               
                   
                   
                 6 mL, wt: 
                 2.26 
                 g 
                 0.377 g/mL 
                 0.53 
                 g Cu 
                 0.0083 
                 M Cu 
               
               
                   
                   
                   
                   
                   
                   
                   
                   
                 0.0083 
                 M CN needed 
               
               
                   
                   
                   
                   
                   
                   
                   
                   
                 0.216 
                 g CN needed 
               
               
                   
                   
                   
                   
                   
                   
                   
                   
                 0.429 
                 g NaCN 95% needed 
               
               
                   
                   
                   
                   
                   
                   
                 15 
                 mL resin 
                 6.09 
                 g 
               
               
                   
                   
                   
                   
                   
                   
                 0.79 
                 g Cu 
                 0.0125 
                 M Cu 
               
               
                   
                   
                   
                   
                   
                   
                   
                   
                 0.0125 
                 M CN needed 
               
               
                   
                   
                   
                   
                   
                   
                   
                   
                 0.324 
                 g CN needed 
               
               
                   
                   
                   
                   
                   
                   
                   
                   
                 0.64 
                 g NaCN 95% needed 
               
               
                   
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
             
               
               
               
               
             
               
               
             
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 04116-001 Test IX-16 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Elution of copper from IX-6AR (˜13% Cu, ˜14% CN) resin using NaCN at 50% of the 
               
               
                   
                 requirement for removing Cu and at a solution-to-resin ratio of 2.5-to-1, in a bottle. 
               
               
                 Procedure: 
                 The feed resin was placed in a small bottle. Water was drained/decanted. 
               
               
                   
                 The eluant was prepared then added to the bottle. 
               
               
                   
                 The bottle was capped and rolled overnight. 
               
               
                   
                 The resin slurry was filtered by gravity on a cup. 
               
               
                   
                 The resin was washed slowly with ˜40 mL water. 
               
               
                   
                 The filtrate and the wash were combined for analysis of CN T  and Cu. 
               
               
                   
                 The eluted resin was submitted for analysis of Cu and Zn by XRF. 
               
             
          
           
               
                 Resin: 
                 IX-6AR containing ˜13% Cu (˜53 g/L Cu), ˜14% CN (57 g/L CN) 
                 Volume: 
                 10 mL 
               
               
                 Eluant: 
                 8.67 g/L CN 
                 Volume: 
                 25 mL 
               
               
                   
                 (0.43 g NaCN 95%) 
               
             
          
           
               
                 Temperature: 
                 20-25° C. 
                 Sol-to-Resin Ratio: 
                 2.5-to-1 
               
             
          
           
               
                 Method: 
                 Bottle on roller overnight 
               
             
          
           
               
                   
                 Analysis (mg/L, %) 
                   
                   
               
             
          
           
               
                   
                 Volume 
                 Mass 
                   
                   
                   
                 CN:Cu 
                   
                   
                 Cal. Resin (%) 
                   
               
             
          
           
               
                 Sample 
                 mL 
                 g 
                 * 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 CN 
                 Cu 
                 SCN 
                 51.6 g/L Cu 
                 49.5 g/L CN 
               
               
                   
               
               
                 Feed resin 
                 10 
                 4.06 
                 12.2 
                 0.81 
                 12.7 
                 2.1 
                 2.85 
                   
                 12.2 
                 12.7 
                   
               
               
                 Eluant 
                 25 
                   
                 8670 
                   
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Effluate &amp; wash 
                 60 
                   
                 3950 
                 NA 
                 2900 
                 3.3 
                 NA 
                 — 
                 11.7 
                 8.12 
               
               
                 Eluted resin 
                 10 
               
               
                 Calc. 
                 10 
                 3.80 
                 11.7 
                   
                 8.12 
                 3.1 
                 — 
                 — 
               
               
                 Assay 
                 10 
                 3.80 
                 10.8 
                 0.77 
                 9.77 
                 2.4 
                 NA 
                 — 
               
               
                   
               
               
                 *Feed resin being reassayed for CN(T)  
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                 2 mL 
                 82 
                 mg CN(T) 
                   
               
               
                   
                   
                 6 mL, wt: 
                 2.28 
                 g 
                 0.380 g/mL 
               
               
                   
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
             
               
               
               
               
             
               
               
             
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 04116-001 Test IX-17 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Elution of copper from IX-6AR (˜13% Cu, ˜14% CN) resin using NaCN at 50% of the 
               
               
                   
                 requirement for removing Cu and at a solution-to-resin ratio of 1-to-1, in a bottle. 
               
               
                 Procedure: 
                 The feed resin was placed in a small bottle. Water was drained/decanted. 
               
               
                   
                 The eluant was prepared then added to the bottle. 
               
               
                   
                 The bottle was capped and rolled overnight. 
               
               
                   
                 The resin slurry was filtered by gravity on a cup. 
               
               
                   
                 The resin was washed slowly with ˜40 mL water. 
               
               
                   
                 The filtrate and the wash were combined for analysis of CN T  and Cu. 
               
               
                   
                 The eluted resin was submitted for analysis of Cu and Zn by XRF. 
               
             
          
           
               
                 Resin: 
                 IX-6AR containing ˜13% Cu (˜53 g/L Cu), ˜14% CN (57 g/L CN) 
                 Volume: 
                 10 mL 
               
               
                 Eluant: 
                 21.68 g/L CN 
                 Volume: 
                 10 mL 
               
               
                   
                 (0.43 g NaCN 95%) 
               
             
          
           
               
                 Temperature: 
                 20-25° C. 
                 Sol-to-Resin Ratio: 
                 1-to-1 
               
             
          
           
               
                 Method: 
                 Bottle on roller overnight 
               
             
          
           
               
                   
                 Analysis (mg/L, %) 
                   
                   
               
             
          
           
               
                   
                 Volume 
                 Mass 
                   
                   
                   
                 CN:Cu 
                   
                   
                 Cal. Resin (%) 
                   
               
             
          
           
               
                 Sample 
                 mL 
                 g 
                 * 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 CN 
                 Cu 
                 SCN 
                 51.6 g/L Cu 
                 49.5 g/L CN 
               
               
                   
               
               
                 Feed resin 
                 10 
                 4.06 
                 12.2 
                 0.81 
                 12.7 
                 2.1 
                 2.85 
                   
                 12.2 
                 12.7 
                   
               
               
                 Eluant 
                 10 
                   
                 21676 
                   
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Effluate &amp; wash 
                 45 
                   
                 5050 
                 NA 
                 3870 
                 3.2 
                 NA 
                 — 
                 11.9 
                 8.14 
               
               
                 Eluted resin 
                 10 
               
               
                 Calc. 
                 10 
                 3.82 
                 11.9 
                   
                 8.14 
                 3.2 
                 — 
                 — 
               
               
                 Assay 
                 10 
                 3.82 
                 11.4 
                 0.74 
                 9.44 
                 2.6 
                 NA 
                 — 
               
               
                   
               
               
                 *Feed resin being reassayed for CN(T)  
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                 2 mL 
                 87 
                 mg CN(T) 
                   
               
               
                   
                   
                 6 mL, wt: 
                 2.29 
                 g 
                 0.382 g/mL 
               
               
                   
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
             
               
               
               
               
             
               
               
             
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 04116-001 Test IX-18 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Elution of copper from IX-6AR (˜13% Cu, ˜14% CN) resin using NaCN at 50% of the 
               
               
                   
                 requirement for removing Cu and at a solution-to-resin ratio of 1-to-1, in a bottle. 
               
               
                 Procedure: 
                 The feed resin was placed in a small bottle. Water was drained/decanted. 
               
               
                   
                 The eluant was prepared then added to the bottle. 
               
               
                   
                 The bottle was capped and rolled overnight. 
               
               
                   
                 The resin slurry was filtered by gravity on a cup. 
               
               
                   
                 The resin was washed slowly with ˜40 mL water. 
               
               
                   
                 The filtrate and the wash were combined for analysis of CN T  and Cu. 
               
               
                   
                 The eluted resin was submitted for analysis of Cu and Zn by XRF. 
               
             
          
           
               
                 Resin: 
                 IX-6AR containing ˜13% Cu (˜53 g/L Cu), ˜14% CN (57 g/L CN) 
                 Volume: 
                 10 mL 
               
               
                 Eluant: 
                 32.51 g/L CN 
                 Volume: 
                 10 mL 
               
               
                   
                 (0.65 g NaCN 95%) 
               
             
          
           
               
                 Temperature: 
                 20-25° C. 
                 Sol-to-Resin Ratio: 
                 1-to-1 
               
             
          
           
               
                 Method: 
                 Bottle on roller overnight 
               
             
          
           
               
                   
                 Analysis (mg/L, %) 
                   
                   
               
             
          
           
               
                   
                 Volume 
                 Mass 
                   
                   
                   
                 CN:Cu 
                   
                   
                 Cal. Resin (%) 
                   
               
             
          
           
               
                 Sample 
                 mL 
                 g 
                 * 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 CN 
                 Cu 
                 SCN 
                 51.6 g/L Cu 
                 49.5 g/L CN 
               
               
                   
               
               
                 Feed resin 
                 10 
                 4.06 
                 12.2 
                 0.81 
                 12.7 
                 2.1 
                 2.85 
                   
                 12.2 
                 12.7 
                   
               
               
                 Eluant 
                 10 
                   
                 32513 
                   
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Effluate &amp; wash 
                 45 
                   
                 7850 
                 NA 
                 5450 
                 3.5 
                 NA 
                 — 
                 11.5 
                 6.19 
               
               
                 Eluted resin 
                 10 
               
               
                 Calc. 
                 10 
                 3.77 
                 11.5 
                   
                 6.19 
                 4.0 
                 — 
                 — 
               
               
                 Assay 
                 10 
                 3.77 
                 10.5 
                 0.77 
                 8.07 
                 2.8 
                 NA 
                 — 
               
               
                   
               
               
                 *Feed resin being reassayed for CN(T)  
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                 2 mL 
                 79 
                 mg CN(T) 
                   
               
               
                   
                   
                 6 mL, wt: 
                 2.26 
                 g 
                 0.377 g/mL 
               
               
                   
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
             
               
               
               
               
             
               
               
               
               
             
               
               
             
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                   
               
               
                 Project 04116-001 Test IX-19 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Purpose: 
                 Elution of copper from IX-6AR (˜13% Cu, ˜14% CN) resin using NaCN at 50% of the 
               
               
                   
                 requirement for removing Cu and at a solution-to-resin ratio of 1-to-1, in a bottle. 
               
               
                 Procedure: 
                 The feed resin was placed in a small bottle. Water was drained/decanted. 
               
               
                   
                 The eluant was prepared then added to the bottle. 
               
               
                   
                 The bottle was capped and rolled overnight. 
               
               
                   
                 The resin slurry was filtered by gravity on a cup. 
               
               
                   
                 The resin was washed slowly with ˜40 mL water. 
               
               
                   
                 The filtrate and the wash were combined for analysis of CN T  and Cu. 
               
               
                   
                 The eluted resin was submitted for analysis of Cu and Zn by XRF. 
               
             
          
           
               
                 Resin: 
                 IX-6AR containing ˜13% Cu (˜53 g/L Cu), ˜14% CN (57 g/L CN) 
                 Volume: 
                 10 mL 
               
               
                 Eluant: 
                 10.84 g/L CN 
                 Volume: 
                 10 mL 
               
               
                   
                 (0.22 g NaCN 95%) 
               
             
          
           
               
                 Temperature: 
                 20-25° C. 
                 Sol-to-Resin Ratio: 
                 1-to-1 
               
             
          
           
               
                 Method: 
                 Bottle on roller overnight 
               
             
          
           
               
                   
                 Analysis (mg/L, %) 
                   
                   
               
             
          
           
               
                   
                 Volume 
                 Mass 
                   
                   
                   
                 CN:Cu 
                   
                   
                 Cal. Resin (%) 
                   
               
             
          
           
               
                 Sample 
                 mL 
                 g 
                 * 
                 Zn 
                 Cu 
                 M/M 
                 S(T) 
                 SCN 
                 CN 
                 Cu 
                 SCN 
                 51.6 g/L Cu 
                 49.5 g/L CN 
               
               
                   
               
               
                 Feed resin 
                 10 
                 4.06 
                 12.2 
                 0.81 
                 12.7 
                 2.1 
                 2.85 
                   
                 12.2 
                 12.7 
                   
               
               
                 Eluant 
                 10 
                   
                 10838 
                   
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 Effluate &amp; wash 
                 50 
                   
                 2430 
                 NA 
                 1920 
                 3.1 
                 NA 
                 — 
                 11.9 
                 10.3 
               
               
                 Eluted resin 
                 10 
               
               
                 Calc. 
                 10 
                 3.97 
                 11.9 
                   
                 10.3 
                 2.5 
                 — 
                 — 
               
               
                 Assay 
                 10 
                 3.97 
                 9.52 
                 0.73 
                 11.5 
                 1.8 
                 NA 
                 — 
               
               
                   
               
               
                 *Feed resin being reassayed for CN(T)  
               
               
                 NA: not analyzed  
               
             
          
           
               
                   
                 Eluted Resin 
                 1.8 mL 
                 68 
                 mg CN(T) 
                   
               
               
                   
                   
                   6 mL, wt: 
                 2.38 
                 g 
                 0.397 g/mL 
               
               
                   
                   
               
             
          
         
       
     
     In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained. 
     As various changes could be made in the above processes without departing from the scope of the invention, it is intended that all matter contained in the above description shall be interpreted as illustrative and not in a limiting sense.