METHOD OF PROCESSING GOLD-ARSENIC CONCENTRATES Russian patent published in 1997 - IPC

FIELD: precious metals production. SUBSTANCE: in a method of processing gold-arsenic concentrates involving bacterial leaching, cyanidation of bacterial leaching cakes, and detoxification of cyanidation tails, aforementioned bacterial leaching is conducted at iron to arsenic molar ratio in bacterial solution equal to (6- 9):1, and, after detoxification of cyanidation tails, solid phase of slurry is submitted to heat treatment at 200-300 C. Method may be applied in the process of detoxification of arsenic-containing products of biohydrometallurgical processing of concentrates. EFFECT: reduced washing in of arsenic from arsenic-containing products of gold-arsenic concentrate processing into contacting liquid phase under long-term storage. 1 tbl