In the process of preparing titanium tetrachloride by chlorination technology, vanadium oxychloride and titanium tetrachloride will be extracted and condensed at the same time. Because of the close boiling point, aluminum powder or organic substance is used to remove vanadium oxychloride from titanium tetrachloride in order to prepare titanium products such as sponge titanium, titanium dioxide and so on. The tailing produced by organic refining was a kind of high-quality raw material for vanadium extraction due to the high content of V2O5 (20wt%), and the impurity element is relatively few. In view of the extraction of vanadium from the tailing obtained by organic refining of titanium tetrachloride and the preparation of vanadium pentoxide product, the roasting temperature, the amount of leaching agent, the ratio of liquid to solid and the leaching temperature were studied. Furthermore, the effect of leaching time on the conversion rate and dissolution rate of vanadium in the tailing were studied respectively. The results showed that when calcination temperature was higher than 600℃, carbon and chlorine could be removed efficiently (<0.1%). Vanadium mainly existed in the form of vanadium pentoxide in the slag after roasting. The roasted slag was leached with sodium carbonate aqueous solution, the ratio of liquid to solid was 6 mL/g, the leaching rate of vanadium was 85.5% at 80℃ for 60 min. The leaching solution contained only a small amount of Si, Al, Ti, P impurities, which was suitable to precipitate vanadium product directly. Ammonium metavanadate was prepared by addition of ammonium salt with NH4+:V=2.5:1 (molar ratio), and stirring at room temperature for 120 min, after filtering, washing, drying and calcining to obtain vanadium pentoxide. The chemical composition of vanadium pentoxide can fully meet the requirement of grade 99 powder vanadium. The vanadium yield of the whole process was 75%.
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