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以攀钢集团所产高钙高磷钒渣为原料,针对高钙高磷钒渣不能直接采用现有产业化提钒工艺进行生产的现状,采用“钙化焙烧-碳酸钠浸出”工艺进行了高钙高磷钒渣提钒试验研究。考察了焙烧温度、焙烧时间、浸出温度、浸出时间、浸出剂浓度、液固比对钒转浸率的影响,并进行了稳定试验。通过试验获得的最佳工艺参数:焙烧温度为860℃,焙烧时间为80~120 min,碳酸钠溶液浓度为10%,浸出温度为95℃,浸出时间为100~120 min,液固比为4∶1 ml·g~(-1)。结果表明:通过钙化焙烧-碳酸钠浸出能够使高钙高磷钒渣中钒的转浸率达到约90.69%,浸出液中的P,Cr等杂质含量符合在碱性条件下沉偏钒酸铵的要求。相比钠化焙烧-水浸提钒工艺,“氧化焙烧-碳酸钠浸出”工艺能够保证高钙高磷钒渣有较高的钒浸出率,消除了焙烧过程中Ca O对钒转化率的影响,减少了由于除P造成的钒损失,对高钙高磷钒渣的产业化提钒具有重要意义。
Taking the high-calcium and high-phosphorus vanadium slag produced by Panzhihua Iron and Steel Group as raw materials, the status of production of high-calcium and high-phosphorus vanadium slag can not be directly adopted by existing industrialized vanadium extraction process, and the process of calcification roasting and sodium carbonate leaching is adopted Study on Vanadium Extraction from High Phosphorus and High Phosphorus Slag. The effects of calcination temperature, calcination time, leaching temperature, leaching time, leachate concentration and liquid-solid ratio on the vanadium conversion were investigated and the stability test was carried out. The optimum technological parameters obtained through the experiment are the calcination temperature is 860 ℃, the calcination time is 80 ~ 120 min, the concentration of sodium carbonate solution is 10%, the leaching temperature is 95 ℃, the leaching time is 100 ~ 120 min and the liquid-solid ratio is 4 : 1 ml · g ~ (-1). The results showed that the calcined roasting and leaching of sodium carbonate could make the vanadium transfer rate reach 90.69% in the high-calcium and high-phosphorus vanadium slag and the content of P, Cr and other impurities in the leaching solution conformed to that of the ammonium metavanadate Claim. Compared with sodium roasting and water leaching, the technology of “roasting-sodium carbonate leaching” can ensure high vanadium leaching rate of high-calcium and high-phosphorus vanadium slag and eliminate the influence of CaO on vanadium conversion during roasting , Which reduces the vanadium loss caused by the addition of P, and is of great significance to the industrialization of high-calcium and high-phosphorus vanadium slag.