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

FIELD: metallurgy of nonferrous and platinum metals; reworking of copper-and-nickel raw materials containing platinum metals. SUBSTANCE: proposed method includes two leaching stages at atmospheric and increased pressure in presence of oxygen. At first stage, mainly iron is solubilized by leaching with sulfuric acid solutions at atmospheric pressure in presence of oxygen; after-leaching residue is subjected to oxidizing dissolution in autoclave solubilizing copper, nickel and cobalt; solid residue is filtered and is directed for obtaining concentrates of precious metals and solution is fed to first dissolution stage. EFFECT: reduced power requirements; low cost of reworking of products considerable amount of iron and sulfur. 2 ex