硫酸镁磷渣中钒的浸出研究

Research on Leaching Vanadium from Magnesium Sulphate Phosphorus Slag

利用高压釜浸出手段,采用氢氧化钠-碳酸钠-双氧水为浸出剂对钒湿法生产过程中产生的除磷渣进行了浸出,考察了氢氧化钠、碳酸钠以及双氧水的用量,浸出温度、浸出时间、固液比、搅拌速度等因素对钒和磷的浸出率影响。结果表明,采用氢氧化钠-碳酸钠-双氧水以1∶2∶4的比例进行浸出可以提高除磷渣中钒的浸出,同时抑制了磷的浸出。优化的浸出条件为浸出温度230℃,浸出时间2h,固液比1∶3,搅拌速度200r/min,在此优化条件下V_(2)O_(5)及P的浸出率分别为95.47%,46.10%。大部分磷存在于渣中,浸出液中的磷含量较低可以直接利用硫酸镁除磷后进行沉钒生产偏钒酸铵。

By means of autoclave leaching,sodium hydroxide sodium carbonate hydrogen peroxide was used as the leaching agent to leach the phosphorus removal slag produced in the vanadium hydrometallurgical production process.The effects of the amount of sodium hydroxide,sodium carbonate and hydrogen peroxide,leaching temperature,leaching time,solid-liquid ratio and stirring speed on the leaching rate of vanadium and phosphorus were investigated.The results show that the leaching of vanadium in phosphorus removal slag can be improved and the leaching of phosphorus can be inhibited by using sodium hydroxide sodium carbonate hydrogen peroxide at the ratio of 1:2:4.The optimized leaching conditions are leaching temperature 230℃,leaching time 2 hours,solid liquid ratio 1:3,stirring speed 300 r/min.Under the optimized conditions,the leaching rates of V2O5 and P are 95.47%and 46.10%respectively.Most phosphorus exists in the slag,and the low phosphorus content in the leaching solution can be directly used to precipitate vanadium to produce ammonium metavanadate after phosphorus removal by magnesium sulfate.