With the development of science and technology, the preparation and processing methods of materials have made great progress. Arc plasma technology is a process that has been rapidly popularized in recent years. It is widely used in industrial fields such as plasma welding, cutting, spraying, melting and other materials preparation and processing, as well as emission electric light sources, microwave power tubes, vacuum tubes, and ion bodies. Fields such as propellers.

At present, wolframite is the main resource consumed in tungsten smelting in China, and the basic reserves of wolframite resources will be exhausted in a few years. In addition, most of the newly discovered tungsten resources are complex scheelite resources, which has shown the absolute predominance of scheelite. Therefore, the development of scheelite resources to replace wolframite is a strategic choice for the sustainable development of tungsten industry in China.

Ultrafine grained tungsten-cobalt cemented carbide has high hardness and high strength, which is widely used in many fields such as woodworking tools, dental tools, metal processing and wear-resistant materials. The properties of ultrafine cemented carbides are closely related to grain size.

Superalloy is a kind of alloy based on iron, nickel and cobalt, serving in high temperature environment, withstanding severe mechanical stress and having good surface stability. It is not only the key material for high temperature components of Aeronautical and aerospace engines, but also the indispensable important material for naval ships, energy, petrochemical and other industrial fields.

Tungsten bronze compounds are a kind of important inorganic compounds. Tungsten ions in these compounds exist in the mixed valence states of W₆⁺, W₅⁺ and W₄⁺, so that the overall charge of the compounds is balanced. Rich crystal structure, tunneling structure and this special valence state make it have excellent properties, such as electronic and ionic conductivity, superconductivity, optical properties, etc. Its applications in secondary batteries, electrochromic, near infrared absorption and chemical sensors have attracted extensive research interest.

High specific gravity tungsten alloys are a kind of tungsten-based alloys, which are composed of Ni, Fe, Co, Cu, Mo, Cr and other elements. Their density is as high as 16.5-19.0g/cm³. They are also known as high density tungsten alloys.

Benzaldehyde is a common intermediate for dyestuff production, and also an important raw material for preparing fine chemicals such as medicine, perfume and coatings. Traditionally, the main production methods of benzaldehyde are oxidation of toluene or chlorination hydrolysis of toluene. However, they have many problems, such as complex process, halogen residue and low selectivity.

The tungsten-titanium (WTi) alloy as the copper wiring diffusion barrier sputtering target has strict requirements on the grain size of the internal structure. For the target of the same composition, the finer and uniform crystal grains, the faster the sputtering rate, the sputter deposition, the better uniformity of film thickness. Studies have shown that the smaller the grain size, the better the properties of the film produced. Therefore, controlling the grain size of the tungsten-titanium alloy target is one of the key factors for obtaining an excellent film.

Nitrogen oxides (NO_x) are the main pollutants causing acid rain and photochemical smog. Their emissions mainly come from fixed sources such as coal-fired boilers, industrial furnaces and mobile sources such as motor vehicle exhaust. With the strengthening of China's environmental protection policy, emission reduction standards are constantly improving and economic operation.

In commerce, phosphotungstic acid is mainly used as catalyst in the homogeneous reaction of tetrahydrofuran to prepare polytetramethylenediol. Normally, the higher the acidity of the phosphotungstic acid catalyst used, the higher its activity, especially the phosphotungstic acid with Keggins structure is most recognized.