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.

Doped tungstate is the use of chemical or physical means to embed particles on the main lattice of catalyst, introduce new electronic center and new charge into the lattice, form lattice defects and change the type of lattice, adjust or change the energy band structure of catalyst to affect the movement of photogenerated electrons and holes, and ultimately lead to the change of photocatalytic activity of catalyst.

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.

The narrow band gap (about 2.7eV) of WO₃ makes it have better absorption in visible light area, which is obviously superior to the traditional TiO₂ photocatalyst, but it also has the disadvantages of high carrier recombination rate and low visible light photocatalytic activity. The separation efficiency of photogenerated electron hole pair of WO₃ can be improved by the control of graphene recombination, crystal structure and morphology, and then the photocatalytic activity can be improved.