Separation of Vanadium and Chromium from Vanadium-chromium Solution by Calcium Salt Precipitation

Vanadium and chromium were selectively separated from the vanadium-chromium solution by calcium salt precipitation.The effects of CaO dosage,precipitation temperature and time on vanadium precipitation and the removal of chromium from calcium vanadate were studied.The results show that a precipitation rate of 99.89% and 1.26% respectively for vanadium and chromium can be obtained at 90～95 ℃ for 60～90 min with the ratio of actual amount of CaO to theoretical amount of CaO at 1.17～1.25.After beating and washing at room temperature,the content of chromium in calcium vanadate is about 0.06%,leaving the main phase of Ca₁₀V₆O₂₅.