Tungsten slab is the precursor form of tungsten plate. Tungsten plate is mainly used to make temperature standard light source, tungsten evaporation boat, electron tube shed, heat shield, high temperature furnace component, X-ray tube tungsten target and so on. Satisfactory results have been obtained in these fields. With the continuous development of science and technology, the application of tungsten plate has been expanding, especially in nuclear energy, medical devices and other fields.

Because of the change of life and work form, modern people spend more and more time in indoor environment. Almost 90% of the time is spent indoors. As a result of poor indoor air quality, a large number of "sick buildings" and the number of people suffering from "building disease syndrome" are increasing.

Cadmium tungstate (CdWO₄) single crystal is subordinate to wolframite structure (monoclinic system), and its melting point is 1289 ℃. It is a very important scintillator material with excellent performance, high luminescence efficiency and energy resolution. It can emit light blue to yellow spectra under the action of ultraviolet light. It has been widely used in light emitting diodes and super large screen displays.

Tungsten slag is produced in tungsten smelting process, that is, tungsten ore and waste tungsten carbide raw materials are decomposed by wet method in high temperature or aqueous solution to obtain primary tungsten products (sodium tungstate, ammonium paratungstate) and solid waste slag (i.e. tungsten slag).

Q-switched laser technology is a technology that compresses the general output continuous laser energy into a very narrow pulse to emit, so that the peak power of the light source can be increased by several orders of magnitude. Because Q-switched lasers can obtain high peak power and narrow pulse width, they are widely used in industrial processing and scientific research fields, such as the manufacture of ultrafine semiconductors, terahertz wave equipment and so on.

Tungsten metal has excellent physical and chemical properties, such as high melting point (3410 ℃), high density (19.35g/cm³), high conductivity/thermal conductivity, excellent high temperature strength and hardness, low work escape, very low thermal expansion coefficient and vapor pressure, and good corrosion resistance, which makes tungsten an important functional material and high temperature structural material.

Non-noble metal sulfides are layered materials with graphene-like structure, which have good applications in catalysis, microelectronics, semiconductor and other fields. Tungsten sulfide and molybdenum sulfide catalysts have been used as hydrogenation catalysts in petroleum processing. They are widely used in hydrodesulfurization, hydrodenitrification, hydrodearomatization, hydrodeoxygenation and hydrodemetallization.

As the main transition metal selenide, tungsten diselenide (WSe₂) is a kind of engineering material and functional material with many special properties. WSe₂ crystal has a hexagonal sandwich structure similar to MoS₂. Each WSe₂ molecule layer is composed of two Se atom layers with a W atom layer. The W atom layer and Se atom layer are covalently bonded, while the adjacent WSe2 layers are separated by Se layer with a long distance and a weak van der waals force.

In order to ensure the uniformity of the dispersion of the composite particles and to improve the properties of the materials to the greatest extent, it is often required that the doped phase particles be coated on the surface of the matrix particles to form a coating to achieve the best mixing degree.

Suspension bed hydrogenation is an advanced technology for preparing liquid fuel oil from heavy unconventional oil. Suspension bed hydrogenation process requires catalyst with high activity, high dispersibility, high stability and good economy. Tungsten sulfide and molybdenum sulfide catalysts have been used as hydrogenation catalysts in petroleum processing. They are widely used in hydrodesulfurization, hydrodenitrification and other reactions. They are very promising catalysts for heavy oil hydrogenation in suspension bed process to produce clean fuel.