Photocatalytic technology can oxidize organic pollutants into inorganic substances, and the reaction system can convert the absorbed light energy into chemical energy under photocatalysis. This discovery has become a current academic hot spot, especially in the field of organic pollutant treatment and hydrogen analysis.

The application of hard surface material in surface engineering is to coat it on metal or workpiece surface by thermal spraying and other thermal technology, so as to improve the wear resistance, impact resistance, high temperature resistance, corrosion resistance and other properties of the surface, significantly prolong the service life of the workpiece, and save a lot of metal materials and production costs.

Tungsten carbide is one of the most important materials in transition metal carbides. It has excellent properties such as high melting point, hardness, thermal stability and mechanical stability. It is widely used in making cemented carbide materials and has important applications in cermet, mechanical processing, metallurgical minerals, aerospace and other fields.

Fuel cell is an electrochemical device that directly converts chemical energy into electrical energy. One of its key materials is electrode catalyst. For a long time, precious metals such as platinum and ruthenium have been widely used because of their excellent catalytic performance. Alloy catalyst can reduce the Pt loading and improve the catalytic efficiency, but the stability of catalyst needs to be improved.

Tungsten has the advantages of high melting point, high strength, high hardness and high wear resistance. In addition, it has low thermal expansion coefficient, good corrosion resistance and oxidation resistance, and good conductivity and thermal conductivity. Therefore, tungsten has been widely used in cutting-edge scientific fields, national defense industry and civil industry.

Spherical tungsten powder is mainly used in thermal spraying, filter materials, cathode and porous materials because of its good sphericity and fluidity and high compacting density. At present, the demand for high quality spherical tungsten powder is increasing day by day. In the field of thermal spraying, spherical tungsten powder is more uniform and compact because of its good fluidity and high compacting density.

Spherical tungsten carbide powder has high hardness, high wear resistance, acid and alkali resistance, high chemical stability. It has wide potential application value in fuel cell anode, cathode catalyst material, gas sensor, petroleum catalyst and photocatalyst material.

At present, waste tungsten is recycled by re-grinding inserts. But beyond a certain point, it is impossible to grind them again and the purity can not be improved. Therefore, further process is usually needed to complete the recovery of tungsten waste.

Wolframite has a large proportion and is brittle. Slime is easily produced in the process of mining and dressing. In the early stage, shaking bed and centrifugal gravity separation are mainly used to recover wolframite. Shaking bed surface zoning is obvious and easy to operate, but the unit area processing capacity is small, the recovery rate is low when treating fine mud, and metal is easily lost from fine mud. Although centrifugal concentrator has large processing capacity and high recovery efficiency for fine mineral particles, its water consumption is large, and it is difficult to achieve ideal indicators in actual industrial production.

Carbon fiber is known as a new inorganic material. It has a series of excellent properties, such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, radiation resistance, conductivity, heat transfer, shock absorption, noise reduction and so on. As a typical high performance fiber, carbon fiber is widely used as a reinforcing fiber of advanced resin matrix composites. At present, its application field is mainly in Aeronautics and aeronautics, mainly because it can greatly reduce the weight of structural prefabrication and further improve the technical performance.