FIELD: metallurgy.
SUBSTANCE: invention relates to the metallurgy of precious metals for the extraction of gold from refractory finely divided sulphide concentrates. The method includes ultrafine grinding, two-stage oxidative treatment of the ground product at atmospheric pressure, while oxygen treatment is carried out at the first stage, and oxygen-lime treatment, as well as cyanidation of the oxidized product are carried out at the second stage. Two-stage oxidative treatment is carried out with intermediate filtration and with the addition of a soluble compound of divalent lead from 2.0 to 7 kg/t, the first stage of oxygen treatment is carried out for 24 hours to pH 1.6, and the second stage of oxidation - oxygen-lime treatment - for 24 h to create a pH of 11, after which the solid residue is transferred to cyanidation.
EFFECT: method allows to increase the extraction of gold while reducing the consumption of sodium cyanide.
1 cl, 2 tbl, 1 ex
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