METHOD FOR REPROCESSING OF SULFIDE CONCENTRATE WITH HIGH CONTENT OF PYRROTINE Russian patent published in 2005 - IPC

FIELD: autoclave hydrometallurgy, in particular hydrometallurgical reprocessing sulfide concentrates.

SUBSTANCE: method for reprocessing of sulfide concentrates with high content of pyrrotine includes blending of raw concentrate with mineral stabilizing additive; autoclave oxidative leaching of produced mixture in aqueous pulp under oxygen pressure at temperature above the sulfur melting temperature in presence of surfactant to convert non-iron metals into solution, sulfur - to elementary form, iron - to oxides; deposition of non-iron metal sulfides from oxidized pulp solution followed by recovery of non-iron metal sulfides and elementary sulfur by flotation into multiple sulfur-sulfide concentrate and iron oxides into rock refuse. Alkali or alkali-earth compounds with aluminum silicate are used as stabilizing additive, added at mass ratio of pyrrotine to total silica and alumina content of 1:(0.05-0.33) and mass ratio of copper to pyrrotine <1:55; or at mass ratio of pyrrotine to total silica and alumina content of 1:(0.5-0.8) and mass ratio of copper to pyrrotine 1:55 or more. Pyrrolitine decomposition ratio is at least 95 %, and leaching yield of sulfide mass is not less than during treatment of common pyrrotine concentrate.

EFFECT: improved method for reprocessing of sulfide concentrates.

9 cl, 1 tbl, 4 ex