Reference number : GC-2017-Q2-00426, amendment number : , agreement type : G, recipient legal name : Liu, Qi (University of Alberta), recipient country : CA, recipient province : nan, recipient city : Alberta, recipient postal code : nan, program name english : Collaborative Research and Development Grants - Project, program name french : Subventions de recherche et développement coopérative - projet, program purpose english : Most refractory gold ores need to be treated to destroy the encapsulating sulfide minerals to release the gold for_x000D_
cyanidation recovery. Pressure leaching or bioleaching (oxidation) are typically used to destroy the sulfide_x000D_
minerals, followed by cyanide leaching. The presence of carbonate minerals in the refractory gold ore, the_x000D_
generation of partial oxidation product such as elemental sulfur during pressure leaching and bioleaching, are_x000D_
detrimental to the gold recovery process due to wasteful acid and cyanide consumption. We propose to remove_x000D_
these carbonate minerals and elemental sulfur by reverse flotation. For that purpose, appropriate flotation_x000D_
depressants for gold are required, which are not currently available._x000D_
In refractory gold ores the gold is typically associated with arsenopyrite. Often it is required that the_x000D_
arsenopyrite be concentrated to enrich the gold grade for subsequent processing. This usually entails the_x000D_
selective separation of arsenopyrite from pyrite. Current practice is to use strong oxidation reagents to depress_x000D_
arsenopyrite while floating away pyrite. Again suitable gold depressants are required if the ore contains native_x000D_
gold nuggets._x000D_
In the proposed research we will utilize the phenomena of self-assembling of thiol reagents on gold surface to_x000D_
guide the development of gold flotation depressants. Microflotation and batch flotation as well as atomic force_x000D_
microscopic (AFM) force and induction measurements will be performed on gold powders, refractory gold_x000D_
ores, and silicon wafers sputtered with gold. The flotation and force/induction time will be correlated so that_x000D_
the AFM will be the primary tool to assess the effect of reagents on gold. The research will not only develop_x000D_
suitable gold depressants but also suitable evaluation techniques to assess the flotation behaviors of hard-to-get_x000D_
or expensive high purity minerals and precious metal powders., program purpose french : Most refractory gold ores need to be treated to destroy the encapsulating sulfide minerals to release the gold for_x000D_
cyanidation recovery. Pressure leaching or bioleaching (oxidation) are typically used to destroy the sulfide_x000D_
minerals, followed by cyanide leaching. The presence of carbonate minerals in the refractory gold ore, the_x000D_
generation of partial oxidation product such as elemental sulfur during pressure leaching and bioleaching, are_x000D_
detrimental to the gold recovery process due to wasteful acid and cyanide consumption. We propose to remove_x000D_
these carbonate minerals and elemental sulfur by reverse flotation. For that purpose, appropriate flotation_x000D_
depressants for gold are required, which are not currently available._x000D_
In refractory gold ores the gold is typically associated with arsenopyrite. Often it is required that the_x000D_
arsenopyrite be concentrated to enrich the gold grade for subsequent processing. This usually entails the_x000D_
selective separation of arsenopyrite from pyrite. Current practice is to use strong oxidation reagents to depress_x000D_
arsenopyrite while floating away pyrite. Again suitable gold depressants are required if the ore contains native_x000D_
gold nuggets._x000D_
In the proposed research we will utilize the phenomena of self-assembling of thiol reagents on gold surface to_x000D_
guide the development of gold flotation depressants. Microflotation and batch flotation as well as atomic force_x000D_
microscopic (AFM) force and induction measurements will be performed on gold powders, refractory gold_x000D_
ores, and silicon wafers sputtered with gold. The flotation and force/induction time will be correlated so that_x000D_
the AFM will be the primary tool to assess the effect of reagents on gold. The research will not only develop_x000D_
suitable gold depressants but also suitable evaluation techniques to assess the flotation behaviors of hard-to-get_x000D_
or expensive high purity minerals and precious metal powders., agreement title english : Development of gold flotation depressants for refractory gold ores, agreement title french : Development of gold flotation depressants for refractory gold ores, agreement number : CRDPJ, agreement value : 150000.0, agreement start date : 2017-08-23, agreement end date : nan, description english : nan, description french : nan, expected results english : nan, expected results french : nan, additional information english : Grant or Award spanning more than one fiscal year (2017-2018 to 2020-2021)., additional information french : Subvention ou bourse octroyée s'appliquant à plus d'un exercice financier (2017-2018 à 2020-2021)., owner organization : nserc-crsng, owner organization title : Natural Sciences and Engineering Research Council of Canada | Conseil de recherches en sciences naturelles et en génie du Canada