METHOD OF VANADIUM MIDDLINGS PROCESSING Russian patent published in 2001 - IPC

FIELD: nonferrous metallurgy, particularly, methods of processing of various vanadium middlings. SUBSTANCE: method includes chlorination of middlings in melt of alkali metal chlorides in presence of carbon reducing agent with obtaining of salt production wastes and vapor-gas mixture of metal chloride subjected to condensation and rectification-chemical separation with separation of vanadium oxytrichloride, its further processing to produce commercial vanadium pentoxide and vanadium-containing sewage waters. Prior to chlorination, middlings are preliminarily mixed with titanium slag in ratio of (0.1-0.3):1. Then produced mixture is mixed with ground carbon reducing agent and solid ground salt of alkali metal chlorides. Obtained titanium-vanadium mixture is supplied for chlorination. Chlorination process is carried out in chlorinators of titanium production. Salt wastes are poured into circulating solutions in ratio of 1:10. In mixing of vanadium-containing sewage waters from hydraulic washing of salt wastes and/or sublimates, formed solution and/or pulp concentrated by metal chlorines is treated with alkali reagent and obtained hydroxy precipitate is separated from solution and washed to obtain polymetallic concentrate. EFFECT: simplified utilization and neutralization of secondary production wastes with production of commercial products. 7 cl, 1 ex