GOLD AND SILVER RECOVERY FROM SLUDGE BY HCL/H202 LEACH, SEPARATE AGCL AND PPTE AU WITH S02

摘要

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.