
Tungsten oxide, a kind of yellow orthorhombic crystal, is insoluble in water and acid (except HF), but, slowly dissolves in concentrated alkali solution. Tungsten oxide, a kind of tungstic anhydride, is obtained as an intermediate in the recovery of tungsten from its minerals. It is mainly applied in manufacturing tungsten, tungstates, tungsten alloys. There are four types of tungsten oxide: 1. Yellow tungsten oxide, short for YTO, formula is WO3; 2. Blue tungsten oxide, short for BTO, formula is WO2.9…