Ammonium Metatungstate Producing Tungsten Trioxide
Ammonium metatungstate (AMT) preparing tungsten trioxide is one of its numerous uses. Ammonium metatungstate is a white or slightly yellow crystalline powder; when heated to a certain temperature, it will transfer into yellow tungsten trioxide (WO3). The specific performance is that AMT will lose all crystal water and ammonia when heated to above 600℃, after cooling and crystallization, drying the finished product thoroughly, the yellow tungsten trioxide will come into being.
The chemical equation of ammonium metatungstate calcined in the air to prepare tungsten trioxide is as following: (NH4)6H2W12O40.nH2O=12WO3+6NH3↑+(4+n)H2O↑The method of ammonium paratungstate preparing tungsten trioxide is simple and easy to operate, and the finishing product of WO 3 has the advantages of grains uniform, high purity and good quality, which is suitable for the manufacture of tungsten products for counterweight and radiation shielding material, and meets the needs of industrial mass production.
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