METHOD FOR INCREASING GOLD EXTRACTION FROM CARBON RAW MATERIALS AFTER AUTOCLAVE PROCESSING USING ROASTING AUTOCLAVE RESIDUE Russian patent published in 2023 - IPC C22B11/08 C22B3/08 C22B3/24 C22B1/04 

FIELD: metallurgy of non-ferrous metals.

SUBSTANCE: invention is related to processing of gold-bearing concentrates of double hardness. The method includes grinding the initial concentrate, its acid treatment, and subsequent washing of the pulp from chloride ions by decantation or filtration. The thickened pulp is fed into an autoclave for autoclave oxidative leaching. The leached pulp is cooled, conditioned, filtered, washed, and gold is recovered by sorption cyanidation of the autoclave residue. In this case, before sorption cyanidation, the autoclave residue is subjected to oxidative roasting at a temperature of 500-700°C, time 1-2 hours and oxidizer consumption 4000-12000 m³/t.

EFFECT: increased gold recovery from carbonaceous concentrates.

2 cl, 1 dwg, 3 tbl, 1 ex