Study on Reducing Soluble Vanadium Content in the Residue after Sulfuric Acid Leaching of Vanadium Slag Roasted with Calcium Oxide
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摘要: 针对钒渣钙化焙烧熟料在浸出过滤生产中残渣可溶钒含量偏高的问题, 对浸出液固比、浸出时间、料浆停留时间、洗涤次数、淋洗水量、过滤速度进行了研究。结果表明:浸出液固比低于3.6、浸出时间超过240 min、料浆停留时间超过90 min、洗涤1次或不洗涤、淋洗水量低于19 m3、过滤速度超过0.42 m3/min是残渣可溶钒损失的主要原因;浸出液固比高于3.8、浸出时间60~150 min、残渣洗涤3次、淋洗水量20~22 m3、过滤速度0.25 m3/min时, 浸出过滤效果较好, 残渣可溶钒较低。Abstract: Effects of liquid-solid ratio and time of leaching,residence time of slurry,washing times,elution water volume and filtration rate on the soluble vanadium （SV） content of the residue after acid-leaching of vanadium slag roasted with calcium oxide in the industrial production of vanadium oxides were investigated.It is indicated that the soluble vanadium content in the residual is higher with liquid-solid ratio of leaching lower than 3.6,leaching time more than 240 min,slurry residence time more than 90 min,washing times less than once,elution water volume below 19 m3 and filtration rate exceeding 0. 42 m3/min.A more superior leaching and filtration efficiency can be obtained and the soluble vanadium content in the residual is decreased,with liquid-solid ratio of leaching higher than 3.8,60~150 min of leaching time,3 times of washing,20~22 m3 of elution water volume and 0.25 m3/min of filtration rate.
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Key words:
- vanadium slag /
- calcified roasting /
- sulfuric acid leaching /
- soluble vanadium /
- residue
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