钨冶炼除磷渣中浸出钼和钨研究

Study on Leaching Molybdenum and Tungsten Processes of Phosphorus Removal Slag from Tungsten Smelting

钨冶炼除磷渣是重要的钼和钨二次资源。采用热压浸出法从钨冶炼除磷渣中浸出Mo和WO_(3),考察碳酸钠用量、氢氧化钠用量、浸出时间、浸出温度、液固比、搅拌速度对Mo和WO_(3)浸出率的影响。研究结果显示,碳酸钠用量和氢氧化钠用量是影响Mo和WO_(3)浸出率的关键因素,采用碳酸钠-氢氧化钠协同浸出,Mo和WO_(3)的浸出率显著提高。确定较优试验条件为:碳酸钠的用量为理论用量的2.5倍,氢氧化钠用量为理论用量的0.15倍,浸出时间2 h,浸出温度188℃,浸出液固比3∶1,浸出搅拌速度80 r·min^(-1),此条件下,Mo和WO_(3)浸出率分别为99.19%、99.11%。按优化条件进行工业试验,Mo浸出率大于98.50%,WO_(3)浸出率大于98.40%,浸出渣中Mo含量小于0.16%,WO_(3)含量小于0.20%。

Phosphorus removal slag from tungsten smelting was an important recycling resource of Mo and WO_(3).A method of thermal pressure leaching with sodium carbonate and sodium hydroxide was proposed to leach Mo and WO_(3)from phosphorus removal slag from tungsten smelting.The results show that the synergistic leaching with sodium carbonate and sodium hydroxide,the leaching rate of Mo and WO_(3)was raised substantially.Effect of leaching agent dosage of sodium carbonate and sodium hydroxide,leaching time,leaching temperature,leaching liquid to solid rate,leaching stirring speed on the leaching rate of Mo and WO_(3)were investigated.The optimum processes conditions are as follow:250%theoretical dosage of sodium carbonate sodium carbonate,15%theoretical dosage of sodium hydroxide,leaching time 2 h,leaching temperature 188℃,leaching liquid to solid rate 3∶1,leaching stirring speed 80 r/min,the leaching rate of Mo and WO_(3)were reached 99.19%,99.11%,respectively.Under the same optimum processes conditions,an industrial leaching test of phosphorus removal slag was proposed,the leaching rate of Mo and WO_(3)were higher than 98.50%,98.40%,respectively,and the content of Mo and WO_(3)on leaching slag were less than 0.16%,0.20%,respectively.