APT mild reduction producing violet tungsten oxide is processed by using APT as raw material, inject ammonia (NH3) and calcinating in rotary furnace. Ammonia will decompose H2 under high temperature, then APT will calcinate under mild reduction atmosphere, decompose and reduce to generate violet tungsten oxide. Chemical equation is:
Ammonium paratungstate is chemical compound of tungsten, it is white crystalline with flake or needle shape, mainly used to produce tungsten trioxide, blue tungsten oxide or violet tungsten oxide, further more used to produce tungsten powder. Also used as raw material for ammonium metatungstate and other tungsten chemical compound.