Nano tungsten powder is widely applied in aerospace alloy, electronic capsulation alloy, electrode material, micro electronic thin film, sintering aids, protective coating, gas sensing electrode. It is also applied for producing high property tungsten products and nano tungsten wire. 

Tungsten powder can only be produced by powder metallurgy because of its high melting point, that is, tungsten powder can be obtained by reducing tungsten oxide or ammonium paratungstate (APT), and then tungsten and tungsten alloy products can be made. Due to the nature of tungsten itself, the particle size range of tungsten powder obtained by reducing tungsten oxide or ammonium paratungstate is generally 2-5 micron, so it is difficult to obtain ultra coarse tungsten powder.

The preparation of ammonium paratungstate from sodium tungstate solution in tungsten metallurgical process mainly involves two steps: the preparation of pure ammonium tungstate solution and the crystallization of ammonium paratungstate. At present, when ammonium paratungstate is prepared by the above method, it is necessary to convert alkali into NaCl or Na₂SO₄ salt in the production system, which is difficult to recycle economically, resulting in serious environmental problems caused by emissions.

Tungsten carbide (WC) is a kind of functional material with high hardness, good conductivity and high acid resistance. Since the discovery of platinum-like catalytic properties in the 1970s, WC has been widely used in catalytic hydrogenation, dehydrogenation, isomerization, hydrocarbon conversion and synthesis reactions in the chemical field. In the electrochemical field, WC also has a certain application prospect for hydrogen ionization and hydrogen evolution reactions.

The traditional ion exchange process uses strong basic anion exchange resin 201 *7 to adsorb tungsten from alkaline sodium tungstate solution. Ammonium tungstate was obtained by evaporation crystallization of the obtained ammonium tungstate solution. The advantages of this process are short process, simple equipment, easy operation, low labor intensity, easy automation, reduced environmental pollution, workers'operating environment is good, and phosphorus, arsenic, silicon and other impurities have a certain purification effect.

Selective Catalytic Reduction (SCR) is a process for the reduction of NO_x from the atmosphere to N₂ and H₂O under the action of catalysts. At present, in most thermal power plants in China, W-V-Ti composite material is the main catalyst treatment material, in which titanium acts as a carrier, vanadium acts as an activator and tungsten acts as a catalyst.

In China's tungsten reserves, scheelite is 70.4% and wolframite accounts for 29%. But for a long time, scheelite is seldom used because of its complex composition, low grade and difficult mining. With the development of technology, more and more scheelite mining methods are applied.

Heteropoly acids are heteroatom (such as P, Si, Co, etc.) oxyacids and polyatomic (such as Mo, W, V, etc.) oxyacids which are formed by condensation and dehydration according to a certain structure. They have strong acidity and redox properties, and are widely used in the field of catalysts. Phosphotungstic acid is a kind of common heteropoly acid, which has strong acidity, excellent conductivity and strong oxidation performance. It has been widely used in the field of photocatalytic degradation of organic wastewater.

At present, China's wire cutting industry can be said to be "a group of independent warlords". There are many well-known electric discharge machine tool manufacturers, as well as some concentrated industrial clusters of wire cutting machine tools. However, why China's line cutting industry has always taken "medium-speed wire "as the mainstream? Now, check it out with us!

In recent years, with the continuous development of China's manufacturing industry, manufacturers' requirements for machining accuracy have been continuously improved, among which, the need for precisive linear cutting machine is the most urgent. In wire-cutting industry,