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leaching copper gold and silver from CuAuA g ores is analysed and compared with acid leaching A key operation in the cyanide leaching circuit proposed is a SART process Sulphidization
Sep 10 2014 · Many precious metal ores contain copper minerals in various amounts These copper minerals dissolve in cyanide solutions to a greater or lesser degree depending on the particular copper mineral or minerals present their fineness and the dissolving effect of the cyanide solutions In the process of dissolution the copper combines with or as it is termed consumes cyanide and if the
Aug 01 2005 · Deficient cyanide is defined as adding free cyanide initially to the ore but not enough cyanide to fully leach the copper from the ore as CuCN 2 − Free cyanide is where the stoichiometric ratio of added cyanide to copper in the ore is greater than 31 and hence even after complete dissolution of copper from the ore the solution will still contain free cyanide
The effect of glycine addition on gold leaching kinetics in copper–cyanide solutions under different leaching conditions was studied The results show that in the presence of glycine gold dissolution rate increases significantly in solutions containing copper–cyanide species
Selective leaching Glycine The presence of copper minerals with gold is known to lead to many challenges during the cyanidation of gold ores such as high consumption of cyanide with low gold extraction and undesirable impacts on gold recovery during the downstream processes An alternative selective leaching process for copper minerals from copper–
direct cyanide leaching Some epithermal deposits may be freemilling such as the oxidized portion but more commonly contain significant amounts of sulfides in which gold occurs as tiny inclusions or submicroscopic gold and are therefore refractory Silverrich ores and copper sulfide ores Silverrich ores and copper sulfide ores are
Other articles where Vat leaching is discussed gold processing Cyanidation ore cyanidation is accomplished by vat leaching which involves holding a slurry of ore and solvent for several hours in large tanks equipped with agitators For extracting gold from lowgrade ores heap leaching is practiced The huge heaps described above are sprayed with a dilute solution of sodium cyanide
International Cyanide Management Institute 1400 I Street NW Suite 550 Washington DC 20005 USA PH 2024954020
The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows 4 Au 8 NaCN O2 2 H20 4 NaAuCN2 4 NaOH