Ammonium Paratungstate (APT) Calcination

Ammonium Paratungstate Picture

APT calcined in air change course: T ≥ 240 ℃, as ammonium metatungstate (AMT)
300 ~ 350 ℃, ammonium tungsten bronze ATB
400 ℃, the hexagonal WO3
500 ℃, triclinic crystalline tungsten trioxide

APT purity, crystalline of 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 obtained WO3
Rapid heated, larger specific surface area
Slowly heated, perfect crystalline, smaller specific surface area

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