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