用钛白废酸从提钒尾渣中提钒试验研究

Extraction of Vanadium from Vanadium Tailing Slag with Titanium Dioxide Waste Acid

为实现固体和液体废弃物的高值化利用,研究了用钛白废酸从提钒尾渣中提取钒。通过正交试验考察了浸出温度、浸出时间、固液质量体积比、钛白废酸浓度等工艺参数对钒浸出率的影响,优化了浸出条件。为进一步提高钒浸出率,探讨了助浸剂(萤石)和氧化剂(双氧水)的适宜添加量。结果表明:各工艺参数对钒浸出率的影响顺序为浸出温度>浸出时间>固液质量体积比>钛白废酸浓度;在温度80℃、浸出时间2 h、固液质量体积比1∶5、废酸浓度5%优化试验条件下,钒浸出率为53%左右;加入7%萤石和5%双氧水后,钒浸出率可提高至71.09%。

In order to realize the high value utilization of solid and liquid wastes,extraction of vanadium from vanadium tailings with titanium dioxide waste acid was studied.The effects of leaching temperature,leaching time,solid mass to liquid volume ratio,waste acid concentration and other technological parameters on vanadium leaching rate were investigated by orthogonal experiments,and the optimal leaching conditions were determined.In order to further improve the vanadium leaching rate,the appropriate amount of leaching aid(fluorite)and oxidant(hydrogen peroxide)was discussed.The results show that the order of influence of the process parameters on vanadium leaching rate is leaching temperature>leaching time>solid mass to liquid volume ratio>titanium dioxide waste acid concentration.Under the optimum conditions of temperature of 80℃,leaching time of 2 h,solid mass to liquid volume ratio of 1∶5 and waste acid concentration of 5%,the vanadium leaching rate is about 53%.After adding 7%fluorite and 5%hydrogen peroxide,the vanadium leaching rate can be increased to 71.09%.