METHOD OF REWORKING INTERMEDIATE PRODUCTS OF COPPER-AND-NICKEL INDUSTRY Russian patent published in 2000 - IPC

FIELD: non-ferrous metallurgy; reworking intermediate products containing precious metals; metallized and sulfide materials formed in the course of production of non-ferrous metals from copper and-nickel ores. SUBSTANCE: proposed method includes oxidizing sulfuric acid leaching under pressure at heating and aeration of solution, solubilizing nickel, cobalt and copper and bringing metals of platinum group to insoluble residue, reworking insoluble residue by liquid phase sulfatization followed by obtaining concentrate of precious metals; oxidizing sulfuric acid leaching is effected at pressure of 0.8 to 1.6 Mpa in solution containing ion Cu⁺²2-40 g/l 2 to 40 g/l; iron, nickel, cobalt and copper are solubilized and resulting pH of solution is maintained at level not higher than 1.0. Aeration is effected by means of oxygen-containing gas in the amount of 1,4-4,0 nm³ of oxygen per cu.m of solution. EFFECT: increased extraction of non-ferrous and platinum metals; low cost of process. 2 cl, 3 ex