METHOD OF VANADIUM EXTRACTION OUT OF THE HIGHLY CONCENTRATED LIME SLAG Russian patent published in 2007 - IPC C22B34/22 C22B3/08 

FIELD: non-ferrous metallurgy; methods of extraction of vanadium out of the highly concentrated lime slag.

SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, in particular, to vanadium metallurgy, namely to the method of extraction of vanadium out of the highly concentrated lime slag providing for the wet milling of the highly concentrated lime slag with production of the pulp, treatment of the slag pulp with the sulfuric acid and its oxidizing burning, the sulfuric-acidic leaching of the burning product with the subsequent settling of vanadium from solution by hydrolysis. The technical result of the invention is the increased output of the extracted vanadium as the commercial product, and also improvement of the production process indices at reprocessing of the highly concentrated lime slag. For gaining the technical result the milled slag pulp is treated with the concentrated sulfuric acid taken in the amount of 30-35 % to the mass of the slag. The oxidizing burning is conducted at the temperature of 700-950°С. The product of the burning is subjected to leaching in the weak-acid solution of the sulfuric acid and conduct vanadium settling from the produced solution.

EFFECT: the invention ensures the increased output of the extracted vanadium as the commercial product, the improved production process indices at reprocessing of the highly concentrated lime slag.

1 tbl, 8 ex