Recovery of precious metals from metal sulphides

Details Recovery of precious metals from metal sulphides Recovery of precious metals from metal sulphides

C - Chemistry, Metallurgy

22

B

53/230, 53/284

C22B 15/00 (2006.01)

Patent

CA 1073681

ABSTRACT OF THE DISCLOSURE Gold, as well as copper, is recovered from copper bearing sulphidic material containing gold. The copper bear- ing sulphidic material is subjected to a main leach to provide a copper containing main leach liquor and a main residue. A secondary leach with ammonium thiosulphate solution is carried out on the copper bearing sulphidic material before the main leach, or on the residue from the main leach, to provide a gold containing secondary leach liquor and a secondary residue. Copper and gold are recovered from the respective leach liquors. Silver may also be recovered in addition to the gold.

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