The Method for Scheelite Oxide

This invention uses the method of combusting urea to manufacture scheelite oxide. This method, which is to mix nitrate, ammonium salt with combustion urea according to the quality of a certain number of moles is combusting. It can be made into a series of high purity scheelite oxide solid and solution powder that keep a certain period of time to natural cooling. Ammonium salt should be ammonium molybdate or ammonium paratungstate. Nitrate should be the nitrate of Mg, Ca, Sr, Ba, Cr, Mn, Co, Ni, Zn, Cd or Al and nitrate, ammonium molybdate and urea combustion have reaction. The nitrate of Mg, Ca, Sr, Ba, Mn, Co, Ni, Zn or Cd ,ammonium paratungstate and urea combustion have reaction. The number of moles of urea is as 4 ~ 5 times as the total number of moles of ammonium salt and molybdenum ion or tungsten ion. The temperature of combusting is 400 ~ 500 ℃; the time of holding is during 20 ~ 30 min. This method is not only very simple during operating process, short preparation time, low energy consumption, but also particularly suitable for industrial mass production.


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