METHOD OF PROCESSING CONCENTRATES CONTAINING NONFERROUS AND PRECIOUS METALS Russian patent published in 2003 - IPC

FIELD: precious metal technology. SUBSTANCE: invention, in particular, relates to pyrometallurgical processing of silver and gold-containing concentrates. Method of processing indicated concentrates consists in that concentrate is mixed with sodium carbonate and calcium carbonate, mixture is melted, and resulting products: slag and metal alloy combining precious metals are cooled and separated. According to invention, prior to be melted, mixture is supplemented by calcium sulfate and carbon reducing agent and melting is carried out to produce primary matte. The latter is then mixed with iron metal, sodium sulfate, and carbon reducing agent. Mixture is melted to give secondary matte and metal alloy "bullion", which are cooled and separated. EFFECT: reduced residual content of metals in rejected slag and increased selection of precious and nonferrous metals. 3 cl, 4 tbl, 2 ex