Desilication from Alkali Leaching Solution Containing Vanadium and Preparation of High Purity Vanadium Pentoxide
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摘要: 以攀枝花某厂碱性含钒浸出液为原料，分析了浸出液中主要杂质元素构成及硅的去除方法，研究了除硅剂种类、除硅剂的用量、浸出液pH值、反应温度、反应时间、静置时间对除硅效果的影响。结果表明：使用Al2（SO4）3·18H2O作为除硅剂，在n（Al）：n（Si）为0.7，浸出液pH为10.5，反应温度为30℃，反应时间为2 h，静置时间为16 h时，浸出液中硅的去除率大于97%，钒的损失率小于2%，且除硅后钒溶液中Al含量小于0.005 g/L。该方法除硅效果好，不额外引入杂质，且沉淀易沉降过滤。除硅后浸出液经酸性沉钒—返溶—碱性沉钒制备得到五氧化二钒，其中硅和铝含量小于0.002%，纯度高于99.9%，超过标准（YB/T 5304—2011）中99.0%级质量要求。Abstract: Using the alkaline leaching solution containing vanadium produced by a factory in Panzhihua as the raw material,the main impurities and the removal of silicon in the alkaline leaching solution were analyzed,and the influences of desilication agent species,dosage of desilication agent,pH of leaching solution,reaction temperature,reaction time and standing time on the desilication were studied.The results show that with Al2(SO4)3·18 H2O as the desilication agent at n(Al):n(Si)=0.7,10.5 of pH for leaching solution,30℃ of reaction temperature for 2 h and 16 h of standing time,the removal rate of silicon in the leaching solution is more than 97% coupled with less than 2% of vanadium loss rate.Furthermore,the Al content in vanadium solution after silicon removal is less than 0.005 g/L.The method can remove silicon effectively without additional impurities introduced into the solution,and the precipitates are easy to be settled and filtered.Vanadium pentoxide can be prepared from the leaching solution after removing silicon by acid precipitation of vanadium-redissolution-alkaline precipitation of vanadium,in which the content of silicon and aluminum is less than 0.002% and the purity is higher than 99.9%,exceeding the quality requirements of 99.0% grade V2O5 in the standard(YB/T 5304-2011).
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