Ammonium Paratungstate Calcination

Ammonium paratungstate(APT) is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH4)10(H2W12O42)·4H2O.

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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