METHOD OF COMPLEX PROCESSING TECHNOGENIOUS VANADIUM RAW MATERIAL Russian patent published in 2002 - IPC

FIELD: methods of complex processing of technogenious vanadium raw material. SUBSTANCE: proposed method consists in chlorination of metal chlorides in melt forming vapor-and-gas mixture and waste melt of salt chlorates, condensation of vanadium, titanium and silicon chlorides, rectifying and chemical separation of these chlorides, utilization of titanium and silicon tetrachlorides, hydrolysis of vanadium oxytrichloride at separation of sediments of ammonium metavanadate and/or vanadium pentaoxide, separation of sediments from mother liquor, flushing, drying and/or calcination for obtaining commercial vanadium compounds. Chlorination of vanadium raw material is performed together with titanium raw material at initial V₂O₅:TiO₂ mass ratio = (5-20); waste melt of chlorates is subjected to hydraulic washing by draining into mother liquor and intermediate water after processing and hydrolysis of vanadium oxytrichloride. Pulp thus obtained is cooled and is again directed for hydraulic washing of waste melt till saturated solutions are formed as considered by sum of metal chlorides, after which pulp is treated by alkaline reagent in presence of reductants to pH = 3.5 to 5.0 and then flocculant is introduced into pulp. After flocculation and settling, pulp is filtered and sediment is washed and dried and/or calcined, thus obtaining commercial concentrate of chromium and trace rare metals; filtrate and intermediate water are treated by alkaline reagent to pH = 8 to 10 accompanied by mixing with air, after which pulp is additionally treated with alkaline solution of oxidant. The pulp is settled and filtered, sediment is separated from mother liquor, washed, dried and calcined, thus obtaining commercial ferromanganese concentrate; used as titanium raw material is rutile and/or rutile concentrate, and/or ilmenite, and/or ilmenorutile , and/or titanium-containing slags; used as alkaline solution of oxidant is waste milk of lime of process of cleaning waste gases from chlorine. EFFECT: possibility of obtaining additional yield of commercial product; avoidance of discharge of high-toxic secondary waste. 3 cl, 1 ex