Tungsten and molybdenum are similar elements, and their physical and chemical properties are very similar. Tungsten minerals are all associated with molybdenum, but the content is different. With the depletion of high-grade tungsten resources, low-grade tungsten resources and secondary tungsten resources have become more and more important tungsten metallurgical raw materials. The molybdenum ion concentration in calcium tungstate solution produced from these raw materials is also increasing. In order to produce pure tungsten compounds, it is necessary to remove molybdenum completely and efficiently from calcium tungstate solution.

Wear has become one of the main reasons for the failure of modern industrial machinery parts. With the development of industry, more and more high wear-resistant materials are required, and wear-resistant coatings have become the standard of most important wear-prone materials.

Tungsten oxide is a typical transition metal oxide, and nano-tungsten oxide is a new type of functional material. Due to its excellent discoloration performance, it is used in smart windows, large-area flat panel displays, gas sensors, dye-sensitized solar cells, and automatic There are a lot of potential applications in many new fields, such as rearview mirrors and energy storage devices.

Tunsten trioxide is a metal oxide semiconductor. It is a surface conductance (resistance) controlled gas sensitive material. The atomic properties of WO₃ crystal surface are active and it is easy to adsorb gas molecules. When gas molecules adsorb on the crystal surface, the carrier concentration inside the WO₃ crystal will change correspondingly, which shows the change of sensor resistance. Because the active atoms of tungsten oxide are located on the surface of the crystal, the contact area between the crystal surface and gas is greatly enlarged, which can effectively improve the gas sensing performance. It can be used in indoor environment detector, air purifier assembly, dangerous gas alarm device and so on.