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我厂利用钨矿泥和难选钨中矿制取三氧化钨。由于原料含WO_3仅有12～20%,而砷、钼、二氧化硅的含量分别达到2～5%、0.1～0.2%、10～40%,造成钨酸钠溶液的净化比较困难。使用硫化钠除钼砷,获得了满意的技术经济指标。过去,由于钨酸钠溶液钼砷硅的含量都很高,需要反复多次加入氯化镁溶液,才能使产品的砷硅含量达到要求,但砷渣多,钨的损失大,而且不能除钼。在酸分解作业中采用提高酸度及添加钨粉的
I plant the use of tungsten ore and refractory tungsten ore system to make tungsten trioxide. As the raw material contains WO 3 only 12-20%, and the contents of arsenic, molybdenum and silica reach 2-5%, 0.1-0.2% and 10-40% respectively, it is difficult to purify the sodium tungstate solution. The use of sodium sulfide in addition to molybdenum arsenic, obtained a satisfactory technical and economic indicators. In the past, due to the high content of molybdenum, arsenic and silicon in the sodium tungstate solution, the magnesium chloride solution needs to be repeatedly added several times in order to meet the requirement of the arsenic and silicon content of the product. However, the arsenic residue is large and the loss of tungsten is large and the molybdenum can not be removed. In the acid decomposition operation to increase acidity and add tungsten powder