Ammonium Paratungstate Calcination

Ammonium paratungstate calcined in air change course: T ≥ 240 ℃, and transferred as ammonium metatungstate (AMT).

When the temperature is between 300 ~ 350 ℃, it turns into ammonium tungsten bronze ATB. When the temperature is under 400 ℃, it turns into the hexagonal WO3. When the temperature reaches to 500 ℃, it becomes triclinic crystalline tungsten trioxide.

Ammonium paratungstate purity and crystalline are hereditary. Calcination temperature, speed has a significant impact on the physical and chemical properties of the product.

The higher the calcining temperature, the more coarse particle size of the obtained WO3. Rapid heated will cause the larger specific surface area. Slowly heated which results in the perfect crystalline and smaller specific surface area.


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