METHOD FOR PROCESSING PRODUCTS CONTAINING NON-NOBLE METAL CHALCOGENIDES, PLATINUM GROUP METALS AND GOLD Russian patent published in 2005 - IPC

FIELD: noble metal metallurgy, namely separation of platinum group metals and gold from materials on base of non-noble metal chalcogenides.

SUBSTANCE: method comprises steps of treating material with nitric acid solution till oxidation-reduction potential 500-700 mV; extracting non-soluble residue; melting it at adding sodium-containing fluxes, carbon -containing reducing agent and copper- and(or) iron-containing industrial process product obtained at hydrolysis or cementation treatment of solutions of refining production; settling and cooling melt till its solidification. Solidified product is separated according to interface boundaries. Then separated bottom phase of heavy alloy is disintegrated to powder. Method allows to extract to target alloy up to 94% of platinum and palladium, more than 97% of rhodium, iridium and ruthenium. Disintegrated alloy may be processed as concentrate of refining production.

EFFECT: increased content of noble metal in bottom phase, lowered cost of next refining process.

2 cl, 1 ex