METHOD OF REPROCESSING OF PRIMARY GOLD-SULFIDE ORES Russian patent published in 2005 - IPC

FIELD: mining and metallurgy industry.

SUBSTANCE: the invention is pertaining to the field of mining and metallurgy industry and may be used for extraction of gold from gold-sulfide ores of a different mineral composition. The method provides for a coarse breaking of ore, its fine crushing with grading, flotation concentration, bacterial leaching of sulfide flotation concentrate, neutralization of products of bacterial leaching of a sulfide flotation concentrate, a sorption leaching of the neutralized products of bacterial leaching of a sulfide flotation concentrate, joint sorption leaching of tailings of the sorption leaching of the neutralized products of the bacterial leaching of a sulfide flotation concentrate and flotation tailings, a desorption of gold from a saturated sorbent, electrolytic reduction of gold from eluates, smelting of the cathode deposits onto a bullion of Dore alloy. The bacterial leaching of sulfide flotation concentrate is conducted a stage by stage at the temperature of 37-45°C using different communities of bacteria at each stage, with temperature rise on the last stages. Neutralization of the products of the bacterial leaching of the sulfide flotation concentrate is conducted at aeration of the pulp by a compressed air, and after the aeration they conduct an oxidation of the pulp by oxygen and its cyanidation hardening. The sorption leaching of the neutralized products of the bacterial leaching of the sulfide flotation concentrate conduct at the fractional dosing of cyanide. The technical result of the invention is an increased extraction of gold at a decreased consumption of cyanide.

EFFECT: the invention ensures an increased extraction of gold at a decreased consumption of cyanide.

5 cl, 3 dwg, 5 tbl, 1 ex