With the rapid development of economy, the demand for tungsten and cobalt in machinery manufacturing, geology, mining, construction, electronics and chemical industries is increasing. As rare metal elements, tungsten and cobalt are also the main raw materials of cemented carbide. Therefore, it is very meaningful to recycle tungsten and cobalt from scrap cemented carbide.

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.

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.

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.