Tungsten is a refractory nonferrous metal, and is also an important strategic resource. Because of its excellent melting point, hardness, ductility, wear resistance and corrosion resistance, tungsten has been widely applied. At present, the production of APT in China is mainly ion exchange. The quality of APT products is generally the national standard zero grade products, the rest of the national standard first grade or unqualified products.

Impure tungsten products is to use ammonium paratungstate as raw material produced by powder metallurgy process including ammonium paratungstate, tungsten oxide, tungsten powder and tungsten carbide powder in the process should try to avoid a "dirty material", its impurities are not artificially added, but mechanical mixed.

Tungsten concentrates are usually treated with acid or alkali. At present, the domestic tungsten smelting enterprises mainly use NaOH decomposition process, in which raw materials such as phosphorus, arsenic, silicon, tin, fluorine and other impurities will be decomposed and get into the sodium tungstate feed liquid.

Tungsten is widely regarded as the most promising fusion device due to its high melting point, excellent thermal conductivity, low sputtering yield and high self-sputtering threshold, low vapor pressure and low tritium retention facing the plasma material. However, the density of tungsten is very brittle and difficult to process. The preparation of tungsten on the heat sink material by coating technology can overcome these disadvantages.

The reaction principle of tungsten oxide hydrogen reduction process is adsorption-autocatalytic mechanism. Adsorption - autocatalytic mechanism is a hydrogen pass into the tungsten oxide products, hydrogen and tungsten oxide full contact, the reaction, after the tungsten oxide adsorption from the surface to its internal autocatalytic reaction. As the hydrogen adsorption proceeds, the interior of the tungsten oxide is reduced by hydrogen to change its structure and generate new species.

Tungsten oxide hydrogen reduction is one of the methods of reducing tungsten oxide with hydrogen at high temperatures to produce tungsten powder. Compared with other methods such as carbon reduction and zinc reduction, the tungsten oxide hydrogen reduction method has higher purity and easier product property control. Hydrogen reduction method is a widely used and effective method in the field of metal powder production such as tungsten.

Halogen lamps are mainly used in the automotive industry, electronics industry and aerospace lighting industry. Due to the impact and vibration characteristics of the application environment, halogen lamps requires its core material — the recrystallization of tungsten wire forming a good dovetail lap structure, with its length-width ratio larger than 12 , that is high intensity under the state of high temperature ignition point, good sag resistance performance at high temperature and good anti-deformation performance.

The power generated by a nuclear power station reactor is generally controlled by raising or lowering the control rod assembly in the reactor core. Fuel assemblies for modern reactor cores typically use two types of rod control assemblies to control reactivity, namely the RCCA and GRCA.

The kinetics of hydrogen reduction of tungsten oxide include the major thermodynamic changes during the reaction. Thermodynamic analysis of the oxidation of tungsten-hydrogen reduction shows that the reaction between tungsten oxide and hydrogen is rather complicated.

Ammonium paratungstate as the preparation of tungsten trioxide raw materials, with strong microwave absorption capacity. Ammonium paratungstate can rapidly warm up in the microwave field. The use of microwave heating calcined ammonium paratungstate preparation of tungsten trioxide, which can change the traditional production methods, shorten the production time and reduce production energy consumption. However, the tungsten trioxide prepared by calcination at different microwave powers also has different morphological and particle size physical and chemical properties.