日本东京市一家冶金公司研究出一种三氧化钼除钨新工艺。该工艺流程是:首先将含有钨杂质的三氧化钼溶解于氨水中(pH6.5～7.5),获得200～500 g/L 三氧化钼的溶液;然后调整 pH2.5～4.5,将溶液加温至50℃;等溶液慢慢沉淀后,即出现纯钼酸铵,钨几乎被 Tokyo, Japan, a metallurgical company developed a molybdenum trioxide except tungsten new technology. The process is as follows: First, molybdenum trioxide containing tungsten impurity is dissolved in ammonia water (pH6.5-7.5) to obtain a solution of 200-500 g / L molybdenum trioxide; then, the pH value is adjusted to 2.5-4.5, the solution is added Temperature to 50 ℃; and other solutions slowly precipitated, that is pure ammonium molybdate, tungsten is almost