Tungsten powder is the main raw material for the processing of powder metallurgy tungsten products and tungsten alloys. With the rapid development of the microelectronics industry, energy, aviation, machinery industry and other fields, the demand of ultrafine tungsten powder is increasing day by day.

Compared with ordinary powder, WC nano powder has advantages of small particle size, large surface area and high reactive activity. It has remarkable advantages in chemical synthesis, fuel cell and other fields. Therefore, it is of great significance to study a method for preparing high-quality single phase tungsten carbide nano powders.

Tungsten tin ore is a brittle mineral, which is extremely easy to be milled and polished during mineral processing, causing inconvenience to mineral processing.

Tungsten ore is mainly scheelite. The world's scheelite accounts for more than 2/3 of total, and China accounts for 72.1%. Some scholars have improved the method of using ammonium sulphate to decompose scheelite to prepare ammonium partrungstate.

Heteropoly acid is one of the most active catalysts in acid catalytic reaction and redox reaction. Phosphotungstic acid H₃PW₁₂O₄₀•nH₂O is the most widely used in heteropoly acid. The purity of phosphotungstic acid directly affects the conversion rate of the catalytic system. Therefore, the preparation of high purity phosphotungstic acid is especially important.

In general, SCR catalyst must be replaced after three years, because the waste catalyst contains a large number of metal elements, improper treatment will cause pollution to the environment. The waste catalyst contains high value added metals such as titanium, tungsten and vanadium.

Tungsten coated materials can effectively improve the comprehensive performance of tungsten substrate materials, such as oxidation resistance, wear resistance, sweat stain resistance and colourful coloring. Generally, the coated tungsten materials are obtained by CVD or PVD method. The preparation process is more complex and the production cost is higher, and the density of the coating is poor, the thermal matching between the coating and the substrate is poor, and the structure of the coating is difficult to control. The main contents of the new technology are as follows:

Carbon supported platinum catalysts are regarded as ideal fuel cell catalysts. However, the interaction between the carbon carrier and platinum is weak, the carbon carrier is easy to corrode. The nano platinum particles can easily migrate on the surface of the carrier, grow up and even lose, which leads to the degradation of the catalyst activity, and eventually leads to the shorter service life of the fuel cell.

Tungsten doping is a promising and effective way to reduce the phase transition temperature of vanadium didioxide. Doping can improve the electrical properties of vanadium dididioxide thin films, reduce the square resistance of the films, and improve the resistance temperature coefficient of the films. Common methods of doping include evaporation, ion implantation, sol-gel and magnetron sputtering.

The preparation technology of nano cemented carbide is very active. The preparation of nano cemented carbide must first prepare nano tungsten carbide powder with excellent properties. At present, there are methods mainly including direct carbonization, gas phase reaction, high frequency plasma, microwave induction plasma, spray conversion, chemical precipitation and high energy mechanical ball milling.