The production process of Ammonium Metatungstate requires an evaporation crystallization step. In the production process of ammonium metatungstate, evaporation crystallization is a key step. Specifically, a method for producing ammonium metatungstate powder includes taking ammonium metatungstate solution as raw material, going through evaporation crystallization, far-infrared low-temperature heating to remove free water and high-temperature heating and drying treatment, so as to obtain ammonium metatungstate powder with a WO content of 91.0 to 92.5 wt% and a particle size of 15 to 20 μm. This method, due to the use of evaporation crystallization to remove phosphorus, silicon and other impurities through the mother liquor, and then two far-infrared heating to remove free water and drying treatment, respectively, has the characteristics of convenient and accurate temperature adjustment, water molecules are driven out from within the material to the outside, dewatering, drying uniformity, no lumps, and the resulting product has high purity, good quality, fine and uniform powder. Therefore, the step of evaporation and crystallization is indispensable in the production process of ammonium metatungstate, which plays an important role in improving the purity and quality of the product.
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