The alkaline decomposition method of high calcium tungsten ore is first grinding with high calcium tungsten minerals (tungsten concentrates, wolwolwoltungsten medium ore, wolframite, high calcium tungsten fine mud, calcium containing 3%), and then the grinding high calcium tungsten minerals and high concentration alkali are added together in the ordinary stirred autoclave, at the temperature of 130-200°C and pressure 0.15-1.0MPa. Under the conditions of heat preservation and pressure cooking, after the pressure cooking is unloaded, the filtration and washing are carried out at a certain temperature and NaOH concentration, and the sodium tungstate solution is purified. The sodium tungstate solution contains WO₃ 80-300g/L and the free NaOH is 90-280g/L.

Nanocrystalline WC-Co cemented carbide has been widely used in cutting tools, impact tools and wear resistant parts, because of its high hardness and high strength. Nano tungsten powder with uniform particle size and good dispersibility is the key technology for the preparation of high performance nanocrystalline WC-Co cemented carbide.

Tungsten carbide is black hexagonal crystal which has metallic luster, the hardness is closer to diamond. Since 1973, Levy R B firstly brought up the idea of catalytic effect of tungsten carbide like Pt, researchers started using it in multiphase catalytic and electro catalytic field to take place of precious metal catalyst.

China is a main tungsten producing country with more than 20 thousand exportation of coarse tungsten products every year. Over 50% of tungsten consumption in the world is supplied by China. Domestic tungsten metal products output is around 1000~1200 tons. However, high quality tungsten material producing technique and intelligent property are extremely lack in China.

In recent years, due to its excellent electrical conductivity, heat dissipation and expansion coefficient, it is used in large scale integrated circuits and high power microwave devices to make substrate, hot pillow chimera, package connector and heat dissipation element. Because of the high thermal conductivity and heat resistance of the tungsten copper alloy, the power of the microelectronic devices is greatly improved, and the device can be miniaturized. The expansion coefficient can match well with the silicon, gallium arsenide and other semiconductor materials in microelectronic devices, so it is an ideal packaging material.

China is a big country in energy production and consumption. Coal is the main source of energy supply. Coal-fired power generation mainly through direct combustion, coal combustion produced a large number of smoke, nitrogen oxides (NOx), sulfur oxide (SOx), mercury and other heavy metal oxides and a large number of carbon dioxide gas.

Ammonium paratungstate is mainly used in the production of tungsten trioxide and tungsten powder, it can be further processed into tungsten strips, tungsten wires, tungsten carbide, alloy blades, alloy bits, alloy dies and other tungsten products, such as wear resistant, pressure resistant, and high temperature resistant mechanical components.

Among all kinds of renewable energy and clean energy, hydrogen energy is one of the ideal clean energy. It has the advantages of high combustion efficiency, rich resources, no pollution and relatively cheap cost. Hydrogen has a variety of preparation methods. Hydrogen production by electrolysis is the most commonly used method at present. In order to make hydrogen production by electrolysis water, For commercial applications, hydrogen evolution catalyst materials with high catalytic activity must be developed.

The processing technology of the traditional tungsten ore is ore crushing and grinding. The wolframite concentrate is obtained through the shaking table and strong magnetic field. The scheelite concentrate is obtained by flotation and Petrov method. When the traditional method is used to deal with tungsten ore with more than 30% carbonate content, the ideal index can not be obtained many times, and the ratio of useful metals remaining in the tungsten tailings is still large.

Tungsten electrodes are the key materials used in inert gas shielded welding and plasma welding, cutting, spraying and other equipment. At present, thorium and tungsten electrodes (including ThO₂) and cerium tungsten electrodes (including CeO₂) are used more. In addition, a small amount of lanthanum tungsten electrodes and yttrium tungsten electrodes are used.