Separation of Vanadium and Chromium from Vanadium-chromium Solution by Calcium Salt Precipitation
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摘要: 以碱性钒铬溶液为原料,采用钙盐沉钒工艺选择性分离钒与铬,重点研究了CaO用量、沉钒温度、沉钒时间等因素对沉钒效果的影响规律和钒酸钙中铬的脱除方法。结果表明,钒铬溶液在CaO实际用量/理论用量=1.17~1.25、沉钒温度90~95℃和沉钒时间60~90 min等条件下沉钒,钒沉淀率为99.89%,铬沉淀率为1.26%;钒酸钙经常温打浆洗涤后,铬含量约为0.06%,主要物相为Ca10V6O25。Abstract: 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.
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