METHOD OF PROCESSING BLENDED TUNGSTEN-TIN CONCENTRATES Russian patent published in 2006 - IPC C22B34/36 C22B25/00 C22B1/02 C22B3/10 

FIELD: non-ferrous metallurgy; elimination of waste in the course of processing tungsten-tin concentrates, production of calcium tungstate and tin compounds.

SUBSTANCE: proposed method includes reducing roasting of initial concentrate and hydrochloric acid leaching of cinder thus obtained. After hydrochloric leaching, tin hydroxide is settled from solution for obtaining tin dioxide. After acid leaching, solid residue is sintered with soda, sinter thus obtained is subjected to aqueous leaching and calcium tungstate is settled from solution. Solution obtained after settling of tin hydroxide is neutralized by lime milk driving off ammonia which is directed for settling of tin hydroxide; calcium chloride solution thus obtained is directed for settling of calcium tungstate from sodium tungstate solution. Proposed method makes it possible to close technological cycle of processing of blended tungsten-tin concentrates by water, ammonia and calcium chloride, thus reducing formation of wastes in production of tin and tungsten compounds.

EFFECT: reduced formation of wastes due to closed technological cycle.

1 dwg, 1 tbl, 1 ex