EXTRACTION OF BISMUTH AND GERMANIUM FROM WASTES OF BISMUTH ORTHOGERMANATE CRYSTALS PRODUCTION Russian patent published in 2014 - IPC C22B30/06 C22B41/00 C22B7/00 C22B3/06 

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy of scattered elements, particularly, to extraction of bismuth and germanium from secondary stock sources, in particularly, to extraction of bismuth and germanium from oil-abrasive wastes of bismuth orthogermanium crystals production. Proposed method comprises hydrochloride-acid leaching of bismuth and extraction of bismuth from the solution by electrolysis. Said hydrochloride-acid leaching is performed with addition of surfactants to the solution to produce abrasive-germanium-bearing precipitate. Germanium is extracted from said precipitate by distillation of tetrachloride germanium in vapours of hydrochloric acid. Said surfactant represents the commercial mix of oxyethylated alkyl-phenols of commercial grade "АФ" 9-6 at the concentration of 0.01-0.1 wt %.

EFFECT: simplified low-cost process, higher yield.

2 cl, 1 ex