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.

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 disulfide lubricating material is a very excellent new material for wear reduction and energy saving. Its friction coefficient is only 0.03, and its performance is much better than the traditional graphite and molybdenum disulfide. It is known as the new "king of lubrication". It can not only be used in general lubrication conditions, but also in certain high temperature, low temperature, high load, high vacuum, radiation line and corrosive medium and other harsh working environment. It can be in powder state, or mixed with lubricating oil, grease, graphite, gold powder, plastic and other materials to make composite materials.