PROCEDURE FOR BACTERIAL OXIDATION OF SULPHIDE GOLD CONTAINING CONCENTRATES FOR EXTRACTION OF GOLD Russian patent published in 2011 - IPC C22B11/08 C22B3/18 

FIELD: metallurgy.

SUBSTANCE: procedure consists in four-stage bio-oxidation of sulphides with supply of air into bio-pulp of concentrate at flow of bio-pulp through reactors. Bacterial oxidation is performed in bio-pulp containing 7.5-10 % of solid at specific rate of bio-pulp flow (5-7.8)·10^-2 m³/m³ per hour and supply of air at amount required for oxidation of S^2- to S⁴⁺, while iron (II) and arsenic (III) to higher degrees of valence. Also, flow rate of air by stages of bacterial oxidation amounts to %: 80-85 - at the first, 8-10 at the second, 4-6 at the third and 3-4 at the fourth stages.

EFFECT: raised engineering-and-economical performance of process and reduced air consumption.

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