A HYDROMETALLURGICAL PROCESS FOR RECOVERING PRECIOUS METALS FROM ANODE SLIME

摘要

Decopperized anode slime containing gold, silver, selenium, and tellurium is leached with nitric acid and the resulting solution is subjected to the following steps: silver chloride precipitation; simultaneous denitration and chlorination; separation of selenium and tellurium by liquid-liquid extraction; stripping of tellurium; and reduction of selenuim and tellurium by sulphur dioxide. The residue from the nitric acid leaching is subjected to aqua regia leaching; separation of gold by liquid-liquid extraction; and reduction of gold from the gold-loaded extractant directly.