论文部分内容阅读
将工业钨酸通过氨溶制得(NH_4)_2WO_4溶液,再将(NH_4)_2WO_4溶液蒸发得到的仲钨酸铵结晶,一次蒸发的仲钨酸铵又经热离解以改变其不溶于氨水的特性,再将热离解料氨溶,蒸发结晶。这样循环1～2次便可得到高纯度的三氧化钨。
Ammonium paratungstate crystals obtained by evaporating (NH 4) _2WO_4 solution from industrial tungstic acid through ammonolysis were crystallized. The once-evaporated ammonium paratungstate was thermally dissociated to change its property of being insoluble in ammonia water, and then the thermal dissociation material Ammonia solution, evaporation crystallization. This cycle can be 1 or 2 times to get high purity tungsten trioxide.