Tungsten carbide-based cermets are widely used in aerospace, metallurgy, petrochemical, mechanical and other industries because of their high hardness, good toughness and good comprehensive properties. The common tungsten carbide-based cermets for thermal spraying include WC-12Co, WC-17Co, WC-10Co4Cr, WC-CrC-Ni, WC-Ni, etc. WC is a hard wear-resistant phase and Co, CoCr or Ni is a metal bonding phase.

Tungsten carbide is an important part of cemented carbide and cermet. It has high hardness, high wear resistance and excellent fracture toughness. It is known as "industrial teeth". It has been widely used in drilling tools, cutting tools, precision moulds, mining tools, printing needles, military armour piercing projectiles and other fields.

Tungsten has many advantages, such as high melting point, high density, high strength, high hardness, high wear resistance, low thermal expansion coefficient, good corrosion resistance, oxidation resistance and excellent thermal conductivity. It has been widely used in cutting-edge scientific fields, national defense industry and civil industry.

Molasses alcohol wastewater is a kind of high-concentration and high-chroma organic wastewater discharged from the alcoholic workshop of sugar factory after fermentation of molasses to produce alcohol. It is a complex and refractory organic wastewater. It contains rich protein and other organic substances. It also contains more inorganic salts such as N, P, K, Ca, Mg and higher concentration of SO₄^2- and so on. Most of the wastewater is acidic, and its chroma is very high, which will cause serious pollution. Water quality, environment, or cause soil acidification and consolidation, crop disease.

Tetrahydrofuran is a kind of low toxic solvent with high polarity and low boiling point. It is widely used in surface coatings, anticorrosive coatings and film coatings. Its main uses are polytetramethylene ether glycol (PTMEG), polyurethane elastomer and polyurethane artificial leather. It is also used as a solvent in esterification and polymerization to synthesize some hormone drugs in medicine.

Tungsten carbide-copper powder metallurgical composite is a pseudo-alloy composed of tungsten carbide with high melting point, high hardness, high conductivity and high thermal conductivity. Because of its excellent arc erosion resistance, welding resistance, high strength and high hardness, it is widely used as electrical contact materials, resistance welding, EDM and plasma electrode materials, electrothermal alloys and high density alloys. And the heat sink substrates of electronic devices such as computer central processing system, lead frame of large-scale integrated circuits and solid-state microwave tubes.

China is rich in tungsten resources, ranking first in the world, of which scheelite accounts for more than 70%. There are many processing technologies for scheelite, among which sodium-alkali decomposition is the most important one at present. This method can effectively decompose scheelite, but its common problem is that the amount of alkali used is large, usually 2.5-3 times the theoretical amount of alkali used or even higher; in addition, high temperature, high pressure and other means are needed to promote the decomposition of scheelite.

Tungsten metallurgical raw materials are classified into wolframite, scheelite and wolframite mixed ores according to their types, and tungsten concentrate, tungsten intermediate ore and tungsten slime according to their tungsten grade. There are many methods for decomposition of tungsten minerals. At present, atmospheric pressure alkaline boiling process is widely used in our country. It is characterized by the decomposition of tungsten minerals with a certain concentration prepared by fine grinding and NaOH under pressure control of 0.15-0.25 Mpa in the reactor. Because of its long service life, low cost and easy operation, this decomposition method has been used all the time.

Tungsten oxide film is a widely studied functional material. It has excellent short-wave transmittance, and its band gap can be easily adjusted by doping. Through ion implantation, ultraviolet photon irradiation and gas molecular adsorption, its optical and electrical properties will change significantly. Therefore, it has wide application prospects in optical glass, flat panel display, photoelectric conversion, electrochromic, photochromic and other fields.

Cathode is the electronic source and the core part of vacuum electronic devices. Electron emission cathode material is the core component of vacuum electronic devices. At present, the main thermal emission cathode material used in microwave vacuum devices is based on alkaline earth metal Ba.