Process for the recovery of gold from a precious metal...

Details Process for the recovery of gold from a precious metal... Process for the recovery of gold from a precious metal...

C - Chemistry, Metallurgy

22

B

53/168, 53/225

C22B 11/06 (2006.01) C22B 7/00 (2006.01) C22B 7/04 (2006.01)

Patent

CA 1236980

-13- Abstract of the Disclosure A process for the recovery of gold from a precious metal bearing sludge concentrate is disclosed. The process comprises the steps of leaching the sludge with hydrochloric acid and hydrogen peroxide to solubilize at least gold, palladium and platinum, removing silver from the leach slurry as insoluble silver chloride and selectively precipitating gold from the leach solution remaining after removal of silver by reduction with SO2 in the presence of sodium ions.

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