China Nonferrous Metallurgy

In view of the problems such as large storage of vanadium extracted tailings, low utilization of valuable components and great harm to the environment, the process of calcification alkaline leaching under normal pressure was adopted to remove the alkali and extract the valuable metal vanadium. The reaction mechanism was studied and the effects of leaching temperature, alkali concentration, calcium oxide addition and liquid-solid ratio on the leaching rate of sodium and vanadium were investigated through single factor experiments. The results showed that the leaching rate of vanadium and sodium reached 82.25% and 85.36% respectively after 60min leaching under the optimum conditions of 160℃ leaching temperature, 100g·L-1 alkali concentration, 15% CaO addition and 8∶1 liquid-solid ratio. At the same time, the vanadium precipitation method with ammonium metavanadate was also used to obtain V₂O₅ products with purity greater than 97%. The analysis of final slag shows that the content of Na₂O is less than 0.5%, and combined with the alkali metal balance data of chengsteel blast furnace, it can be used in blast furnace ironmaking and ore blending.