Method for leaching gold

Details Method for leaching gold Method for leaching gold

C - Chemistry, Metallurgy

22

B

C22B 11/00 (2006.01) C22B 3/04 (2006.01) C22B 3/44 (2006.01) C22B 11/06 (2006.01)

Patent

CA 2599174

In a method for leaching gold from copper sulfides, the sulfide ores are first subjected to leaching of copper, thereby producing a leaching residue having 7.9% or less of the copper content. This leaching residue is mixed with a leach liquor, which contains the chloride ion and ferric ion and has 1.9 or less of pH. Gold and copper can be effectively leached from the copper sulfide ores. Ordinarily used oxidizing reagents such as hydrogen peroxide or nitric acid are not used. The gold, copper and iron can, therefore, be leached in a single process and by using an identical leaching liquor. The rate of gold leaching reaction can be enhanced by the co-presence of either copper or bromide ion or both together with the chloride and iron ion.

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