Method for preparing molybdenum trioxide from molybdenite

The invention discloses a method for preparing molybdenum trioxide from molybdenite. The method comprises the following steps: soaking the molybdenite with acid to remove impurities, and filtering to obtain refined molybdenite; the refined molybdenite is subjected to high-temperature oxidizing roasting, then a sodium molybdate solution or hydrogen peroxide is adopted to selectively dissolve out molybdenum from the molybdenum calcine, the obtained molybdenum solution makes contact with cation exchange resin or a cation extraction agent, and after impurity removal, a pure molybdenum solution is obtained. And putting the pure molybdenum solution into a high-pressure kettle, adding molybdenum trioxide powder and a regulating agent, and performing thermal decomposition to obtain molybdenum trioxide. And filtering, washing and drying the molybdenum trioxide to obtain molybdenum trioxide powder. 本发明公开了一种从辉钼矿制备三氧化钼的方法，使用酸对辉钼矿浸泡除杂，过滤得到精辉钼矿；将精辉钼矿高温氧化焙烧，结束后采用钼酸钠溶液或过氧化氢对钼焙砂进行选择性溶出钼，得到的钼溶液与阳离子交换树脂或者阳离子萃取剂接触，除杂后得到纯钼溶液。将纯钼溶