METHOD OF PREPARING VANADIUM-CONTAINING SLAG TO OXIDATIVE ANNEALING Russian patent published in 2019 - IPC C22B34/22 C22B5/10 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to methods of extracting vanadium from slag and other vanadium-containing materials, and can be used in production of vanadium products. Preparation of vanadium-containing slag to oxidative annealing includes slag crushing, combined grinding with reagent calcium-containing additive, classification by size, extraction of metal at stages of grinding by means of sieving and magnetic separation with subsequent filtration. Reagent calcium-containing additive additionally contains a finely divided slug of dinas lining of melting furnaces of vanadium pentoxide. Said additive is specified in two steps. First, converter vanadium slag is mixed with limestone by combined wet grinding in ball mills at ratio of added calcium oxide to vanadium pentoxide in composition of charge mixture 0.20–0.45, and at the second step, the vanadium-containing slug of dinas lining is mixed with limestone in a dry-milling bead mill at a ratio of calcium oxide to vanadium pentoxide in mixture of 0.46–0.65 and added to the first stage charge after filtration thereof in amount of 0.5–10 %.

EFFECT: method enables to stabilize oxidative annealing of vanadium slag, increases vanadium extraction by 0,7–1,3 % and recycling of vanadium pentoxide smelting furnace dinas lining slug.

1 cl, 2 tbl