At present, the method of extracting tungsten mostly adopts water immersion method. Before water immersion process, tungsten scrap needs to be sintered. The sintering process directly sinters the mixed powders. During the sintering process, the dust is discharged along with the flue gas, and the valuable metal tungsten is mixed in the dust, which results in the loss of valuable metal tungsten. The unreasonable ratio of raw materials to auxiliary materials leads to the low conversion rate of tungsten when tungsten waste is used to extract tungsten.

With the improvement of science and technology level and the progress of human development level, environmental pollution is becoming more and more serious, toxic and difficult to degrade. Pollutants are more and more widespread in the air, which is harmful to biological safety and ecosystem, and restricts the progress of society.

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.

In the process of producing ammonium paratungstate by ion exchange, SnO₃^2-and SnS₃^2- are two forms of tin in the leaching solution before ion exchange. Among them, SnS₃^2- has much greater affinity with resin than WO₄^2- and is preferentially adsorbed by resin in ion exchange. When tungsten is desorbed, it will be desorbed with tungsten, and tin is difficult to be removed. Therefore, the leaching of SnS₃^2- in the original solution before ion exchange, even in a small amount, often becomes an important reason for APT tin exceeding the standard.

Diamond grinding wheels are widely used in the efficient processing of low iron content metals and hard and brittle materials, such as cemented carbides, high alumina ceramics, optical glass, agate gems, semiconductor materials and stone materials.

Titanium dioxide is a broadband semiconductor material, which is often used to photocatalytic degradation of organic pollutants in gases or liquids. However, it is well known that titanium dioxide is not efficient enough to degrade pollutants in the environment. This is mainly because its wide band gap semiconductor can only respond to the ultraviolet band of sunlight, while ultraviolet light accounts for only 3%-5% of sunlight, which greatly limits the utilization of titanium dioxide to sunlight.

Nano-tungsten trioxide powder is an important industrial raw material, which can be used to prepare nano-tungsten powder and nano-tungsten carbide powder. In addition, nano-WO₃ has strong absorption ability to electromagnetic wave, can be used as excellent absorption material in the utilization of solar energy, and can be used as important invisible material in the military. Nano-WO₃ powder has a huge specific surface, significant surface effect, and is a good catalyst. As a transition metal compound, nano-WO₃ has semiconductor properties and is a potential sensitive material. It is sensitive to many gases such as NO_x, H₂S, NH₃ and so on.

Tungstate, as a new photocatalyst, has good optical properties and few electron recombination centers. Among them, bismuth tungstate Bi₀WO₆ photocatalyst is the most popular. Bismuth tungstate photocatalyst has good ultraviolet and visible photocatalytic properties. It can utilize both ultraviolet and visible light in sunlight. It has a good application prospect in environmental purification.

In the semiconductor industry, the target assembly is composed of a target which meets the sputtering performance and a backplane which can be combined with the target and has a certain strength. The backplane can play a supporting role in assembling the target assembly to the sputtering base, and has the effect of conducting heat. For example, tungsten metal can be selected as target material, copper or copper alloy material with sufficient strength and high thermal conductivity can be selected as backplane to form target component.

The life activities of organisms are mainly carried out by cells, which are isolated from the surrounding environment through cell membranes and maintain a relatively stable internal environment. Cell membranes are mainly composed of lipids arranged into bilayer layers (BLM) and embedded with various functional proteins, which play the roles of material exchange, energy exchange and signal transmission between cells and the external environment.