A METHOD FOR PRODUCING COPPER SULPHATE MONOHYDRATE

Abstract: Small pieces of metallic copper waste are leached in 10 % sulphuric acid while simultaneously hydrogen peroxide is added as a catalyst. Leaching is performed until the pH of the solution is constant (5.0 - 5.5). The lixivium is settled, filtered through a mud-press, concentrated by heating, evaporating and occasional pumping of the new solution until a required concentration of copper of 150g/l is reached. The input solution is transferred to the dusting assembly which sprays the solution at high revolution through jets onto the walls of drying chamber. The generated product is hammered by hammers from the walls and sucked with a blower through a cyclone into a reservoir. The input temperature of the drying chamber is maintained at 230 DEG C and output temperature at 110 DEG C.

Description: A Method for Producing Copper Sulphate Monohydrate BftCKBRBUND OF THE INVENT DN Field of the Invention The present invention relates to a method of producing Z c e sulp a e monohydrate from co per was e by w εtslεs^ technology. npsrriDt.ion of the Related ftrt Copper sulphate is a highly important technical raw material and is exploitable in various industrial and 0 agricultural fields, such as ore treatment - as a flotation regulator, surface treatment of metals, sprays in agriculture, the textile industry - cloth printing, the treatment of water. Currently, only copper sulphate pentahydrate has been used. Its present production is very expensive and time-consuming, because of crystall zation. The resultant product contains five molecules of water and 25.45% of copper. SUMMARY OF THE INVENTION The unsatisfactory state described above is significantly improved by the method of producing of capper sulphate monohydrate according to the present invention, which is based on the fact that diluted sulphuric acid reacts with copper while hydrogen peroxide is used as a catalyst. The copper reacts with the acid as fol lows: Cu + H2 SO4 = CuO + S0 2 + H 2 0 S0 2 + H 2 0 = H2 SD3 H2 SO3 + H2 D2 = H2 SO4 + H 2 0 - heat CuO + H2 SD4 = CUSO4 + H 2 0 When copper reacts with acid, a temperature of &5-80°C and the presence of oxygen is necessary. When using hydrogen peroxide, these requirements are fulfilled as the reaction is strongly exothermic and the peroxide is decomposed as follows: H2O2 = H2O + 1/2 O2 + heat The suggested technology does not produce any waste products. The technological process, which is the subject of this protection, is a significant contribution based on thεr fact that it is a more economically convenient method cf producing copper sulphate and it achieves better parameters. The final product manufactured by the suggested process results in better characteristics and parameters than those achieved by the technologies of producing copper sulphate pentahydrate. DESCRIPTION OF THE PREFERRED EMBODIMENT Small pieces of metallic copper waste are leached under agitatation with 102 acid in a leaching tank with a conical bottom. A sulphuric acid solution (3580 1 of water and 279 kg of concentrated sulphuric acid) is prepared in the tank. Then, copper waste is slowly added to the acid solution while. simuJ taπeπu<=;!y τ y rogen peroxide (33X) is added as a catalyst in small amounts. The reaction is strongly exothermic and therefore heating the tank is not necessary. Leaching is performed until the solution has a constant pH (5.0 to 5.5). When the pH of the solution has been stabilised, this shows that all the free acid has reacted. In total 380 kg of copper and 343 1 of 33% hydrogen peroxide were used. The resultant lixivium is left to settle and an analysis sample is taken - the required concentration is Cu=100g/1. The lixivium is decanted into an intermediate tank after settling. The solution has a typical blue colour. After decanting the lixivium, the acid is prepared in the leaching tank and the whole process is repeated. After leaching no dregs remain in the tank, only unreacted metal waste remains. The solution from the intermediate tank is filtered through a mud-press into a pre-concentrating tank. Concentrating is provided by heating, evaporating and pumping of the new solution. The required concentration of copper is 150g/l. It is necessary to maintain a temperature of 60-70°C. The solution is dosed by a material-dosing pump from the pre-concentrating tank into a drying chamber where the input solution is conducted into a dusting assembly. The said assembly sprays the solution at high revolution through jets onto the walls of the drying chamber. The generated product is hammered by hammers from the walls and sucked with a blower through a cyclone into a reservoir. The waste steam is removed through a chimney. The inout + -pfn err» , f-ι» e of the drying chamber is maintained at 230°C and the output temperature at 110°C. Industrial Exploitation The present invention is exploitable in fluid and gas drying, wood preservation, the dye industry, viticulture, medical purposes, the treatment of water, and the manufacturing of other copper products.

Claims: WHAT IS CLAIMED IS: A method of producing of copper sulphate monohydrate by the leaching of metal waste in sulphuric acid characterised bv the fact th*t X hydrogen peroxide ic added as a catalyst to the diluted sulphuric acid and the solution obtained with a Cu concentration of lO g/1 is dried at a temperature of Z30°C after filtration and thickening to concentration Cu 150g/l.

Inventors: BENEDIKOVA ELEONORA, MEDZO ANDREJ, BENEDIKOVA, ELEONORA, MEDZO, ANDREJ
Applicants: BENEDIKOVA ELEONORA, MEDZO ANDREJ, BENEDIKOVA, ELEONORA, MEDZO, ANDREJ
Application year: 1996
Main classification: C01G3
IPC codes: C01G3