METHOD FOR EXTRACTING OF GOLD FROM REBELLIOUS AURIFEROUS-ARSENICAL ORES Russian patent published in 2007 - IPC C22B11/08 C22B3/18 

FIELD: hydrometallurgy, in particular, extraction of gold from rebellious sulfide auriferous-arsenical ores.

SUBSTANCE: method involves providing crushing, grinding, flotation concentration of basic raw material; performing biological oxidation of concentrate; neutralizing products of biological oxidation; providing sorption cyaniding of neutralized products of biological oxidation and flotation tailings; regenerating sorbent; electrolyzing solutions of eluted gold from sorbent; providing calcination and melting of cathode sediments for producing of alloy gold ingots; providing flotation of ore, which is ground to 85-90% size of 0.074 mm size class, using discharge of thickeners and recycled water from tailings dump, which water being conditioned to residual concentration of cyanide of 0.1-0.2 mg/l. Concentrate is subjected to biological oxidation at temperature of 37-42 C in two stages at concentration of oxygen in pulp of at least 1-2 mg/l. Biological oxidation products are neutralized to pH value of 4-6 without separation of solid from liquid in pulp using flotation tailings at first stage and milk of lime is neutralized at second stage with increase of pH value of pulp to 10.5-11. Neutralized biological oxidation products are subjected to sorption leveling at first stage with NaCN concentration of 400-500 mg/l, and at second stage sorption cyaniding of first stage tailings and all of flotation tailings at NaCN concentration of 200-300 mg/l is performed.

EFFECT: increased extent of extracting gold from rebellious sulfide auriferous-arsenical ores.

5 cl, 1 dwg, 1 tbl