METHOD OF PRODUCING VANADIUM OXIDE Russian patent published in 2012 - IPC C01G31/02 C22B34/22 C22B3/08 

FIELD: chemistry.

SUBSTANCE: invention relates to vanadium oxide extraction. The method of producing vanadium oxide involves preparation of starting vanadium-containing material for burning, burning with lime treatment, leaching with sulphuric acid, separating the solid substance and liquid, precipitation of ammonium polyvanadate with an ammonium salt and removing ammonia by calcination or reduction to obtain vanadium oxide. The solid starting material used at said steps has total amount of alkali metal of not more than 0.3 wt % and total amount of Cl^- and NO₃ ^- ions of not more than 0.1 wt %, and the liquid starting material has total amount of alkali metal of not more than 0.1 g/l and total amount of of Cl^- and NO₃ ^- ions of not more than 0.1 g/l.

EFFECT: invention increases the degree of extraction of vanadium and enables to recycle waste water formed during the vanadium extraction process.

10 cl, 1 dwg, 12 tbl, 3 ex