METHOD OF EXTRACTING VANADIUM AND CHROMIUM FROM VANADIUM-CHROMIUM SLAG Russian patent published in 2019 - IPC C22B34/22 C22B34/34 C22B1/00 C22B3/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy of vanadium and chromium, particularly to utilization of vanadium and chromium contained in vanadium-chrome slags. Method comprises the following steps: a. obtaining mixture of slags with calcined soda and aluminum salt, from which granules are obtained, b. annealing granules containing vanadium-chromium slag, resulting in granules of sintered material; c. obtaining granules of sintered material for water leaching and subsequent separation of leached suspension into solid substance and liquid, resulting in obtaining a solution containing vanadium and chromium, and residues; d. adding calcium oxide to precipitate vanadium for time of 50 to 120 minutes, and obtaining unrefined calcium vanadate and a chromium-containing solution; e. obtaining purified calcium vanadate and flushing water containing vanadium and chromium; wherein washing water containing vanadium and chromium is used for leaching burnt sintered material; f. obtaining sodium dichromate from a chromium-containing solution through carbonization and using a byproduct, sodium bicarbonate, as a sodium-containing additive during vanadium-chrome slag burning.

EFFECT: effective utilization of vanadium and chromium from slags.

6 cl, 3 ex