High-purity ammonium paratungstate is abbreviated as APT. It is the raw material for preparing high-purity tungsten oxide and high-purity tungsten powder. It can be prepared by thermal dissociation and ammonia dissolution. Under high temperature conditions, ammonium paratungstate decomposes to obtain a hydrous tungsten oxide compound that is easily soluble in ammonia water, which is dissolved in ammonia water to obtain an ammonium tungstate solution. After filtering out the insoluble matter, the solution is evaporated and crystallized to obtain high-purity ammonium paratungstate.

The chemical formula of blue tungsten oxide is WO2.9, and its appearance is dark blue powder.

Blue tungsten oxide can be used to produce tungsten powder, and then to produce tungsten products such as cemented carbide, pure tungsten and tungsten alloy products.

Regenerated tungsten carbide powder refers to the raw material used to re-produce alloys after further processing of materials that have been ball-milled or produced into alloys but are unqualified. The performance of recycled tungsten carbide powder is much worse than that of original tungsten carbide powder, and it can generally only be used to prepare low-grade alloy products.

Tungsten dioxide, also known as brown tungsten oxide, has a chemical formula of W O 2 and is insoluble in water, alkaline solution, hydrochloric acid and dilute sulfuric acid. It is a brown monoclinic powder crystal. Tungsten dioxide is unstable and is quickly oxidized to tungsten trioxide in the air. Tungsten powder can be produced by hydrogen reduction.