Ammonium paratungstate is the main raw material of tungsten industry. In a sense, it is a kind of purified tungsten concentrate, that is to say, the tungsten concentrate containing 60% bustard is purified to the intermediate products containing more than 88.5% tungsten oxide. In the final application products of tungsten, more than 70% are made of apt as the main raw material, while the rest are made of ferrotungsten, metatungsten, tungstic acid and waste tungsten.

Ammonium paratungstate is a kind of chemical substance, mainly white crystal, with two kinds of flake or needle, which is used to produce tungsten trioxide or blue tungsten oxide to make tungsten powder. It is also used to manufacture ammonium metatungstate and other tungsten compounds, and used as additives in petrochemical industry.

Tungsten trioxide is an important intermediate product in the process of tungsten extraction and gold treatment. It is the main raw material for the production of tungsten powder and tungsten related products. It is usually obtained by calcining ammonium paratungstate. The traditional production process of tungsten trioxide is to place the powdered ammonium paratungstate in a fixed furnace or a rotary furnace for calcination. 

Calcium tungstate is a very important chemical raw material, which is mainly used to produce ammonium paratungstate, tungsten trioxide, ferrotungsten, alloy steel, hard alloy, tungsten material, tungsten wire and tungsten alloy. It can be concluded that calcium tungstate is a kind of substance with wide application, and the preparation of tungstate from calcium tungstate is also a very interesting process.