METHOD OF PROCESSING COMPOUND TUNGSTEN-TIN CONCENTRATES Russian patent published in 2004 - IPC

FIELD: non-ferrous metallurgy; processing compound tungsten-tin concentrates; production of calcium tungstate and tin compounds. SUBSTANCE: proposed method includes reducing roasting of concentrate followed by subjecting the roasted concentrate to acid leaching. Solution thus obtained is directed for extraction of tin by known technology; tungsten in form of calcium tungstate is extracted from solid residue after acid leaching by sintering with soda followed by aqua leaching and precipitation. Proposed method makes it possible to obtain pure calcium tungsten, as well as tin hydroxide and dioxide. Extraction of tungsten is equal to 97-98%. EFFECT: improved quality of raw materials for production of ferro-tungsten and tin compounds. 1 dwg, 1 tbl, 1 x