Leaching of Vanadium and Chromium from High Chromium Vanadium Slag
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摘要: 高铬钒渣中钒和铬主要以尖晶石结构存在，难以直接溶出。试验以CaF2和MnO2作为助浸剂，对高铬钒渣的酸性湿法浸出过程进行强化。研究了CaF2用量、MnO2用量和反应时间等反应参数对钒铬浸出率的影响。试验结果表明：在酸性条件下，低价钒和铬难以直接溶出，浸出率只有38.47%和14.72%。CaF2的加入可以破坏高铬钒渣表面的硅氧化合物结构，使得低价的钒和铬释放出来，与体系中的MnO2反应被氧化溶出。适当延长反应时间，使各反应物充分接触，可以提高钒和铬的浸出率。在CaF2和MnO2的辅助浸出过程中，钒和铬的浸出率可以提高到62.08%和29.56%。Abstract: Vanadium and chromium are hard to be leached out directly from the high chromium vanadium slag since they co-exist in spinel in the slag.CaF2 and MnO2 were applied to intensify the leaching process of vanadium and chromium from high chromium vanadium slag.The dosage of CaF2,the dosage of MnO2 and reaction time on the leaching efficiency of vanadium and chromium were investigated.The results indicate that the vanadium and chromium in low valence are hard to be leached out in acid condition,with the leaching efficiency of vanadium and chromium at 38.47% and 14.72%,respectively.The addition of CaF2 could destroy the Si-O structure and the vanadium and chromium in low valence can be released out,and then oxidized by MnO2.The leaching efficiency of vanadium and chromium increase with increase of the reaction time.The leaching efficiency of vanadium and chromium can be respectively increased to 62.08% and 29.56% with CaF2 and MnO2 intensifying the leaching process.
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