Ammonium Paratungstate (APT) Calcination
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
Related Products:
0.6um yellow tungsten oxide is a kind of tungsten oxide, with a positive yellow powder appearance, stable properties at normal temperature and apparent density of 0.6-1.0g/cm3.
Ammonium metatungstate(AMT) is an important intermediate compounds of tungsten hydrometallurgical process, appearance is white crystalline powder, solubility in water is the largest in the tungsten compounds which over 300g WO3/100ml H2O (in 25℃).
Sodium tungstate, a tungstate of sodium, is useful as a source of tungsten. It is prepared from tungsten ores used to manufacture tungsten by reducing it.
Purple Tungsten oxide is divided into WO2.72 (or W18O49). It is a kind of tungsten oxide. It is abbreviated as VTO. It is a purple finely grained crystalline powder, and its color usually appears purple or blue purple.