METHOD FOR IMPROVING SELECTIVITY AND EXTRACTION OF SULFIDE NICKEL ORES FLOTATION THAT CONTAIN PYRROTINE BY USING SYNERGY OF MULTIPLE DEPRESSORS Russian patent published in 2017 - IPC B03D1/01 B03D1/02 

FIELD: metallurgy.

SUBSTANCE: method for improving selectivity and extraction of valuable non-ferrous sulphide minerals associated with iron sulphides during froth flotation of non-ferrous metal sulfides comprises treament of sulphide ore with either fresh-ground slurry or pre-treated and fine-ground intermediate product that contains at least one or more sulphide minerals of industrial meaning as non-ferrous metals with iron sulfides, in aqueous alkaline suspension in the presence of a collector, foam agent, PH modifier, a carrier gas distributed on the suspension, and multiple depressants, performing froth flotation to suppress iron sulfides while ensuring flotation of sulfides of non-ferrous metals. The depressants comprise at least one organic polymer selected from hardwood lignosulfonates, at least one sulfur-containing compound selected from water-soluble inorganic sulfur-containing compounds, and at least one nitrogen-containing organic compound selected from polyethylene polyamines.

EFFECT: improvement of iron sulphide suppression without reducting valuable sulphide metals extraction, reduction of environmental pollution.

21 cl, 9 dwg, 9 tbl, 9 ex