Tungsten is an important thermal spraying material. Thermal spraying technology uses heat source to heat the spray material to melt or semi dissolve state, and spray at certain speed to deposit the coating on the pretreated substrate surface. The thermal spraying technology makes a special working surface on the surface of the ordinary material. 

Hard alloy with high hardness hard tungsten carbide micron metal powder as the main ingredient, with cobalt (Co), nickel (Ni), molybdenum (Mo) as the binder, powder metallurgy products in vacuum furnace or hydrogen reduction furnace in sintering, different tungsten content plays a key role in the performance of the alloy. The detection requirements must be accurate and reliable, the test for the tungsten content of hard alloy mainly has the gravimetric method, colorimetry and atomic absorption spectrometry.

Tungstic acid is acidic substances a yellow powder, tungsten trioxide containing about 90%, also contains trace tin, molybdenum, silicon, calcium, iron, manganese, potassium, sodium, chlorine, phosphorus, sulfur, arsenic, antimony, magnesium and other elements, is the raw material for the production of ammonium paratungstate.

With the development of the subsequent product process of tungsten, tungsten wire, tungsten powder, tungsten bars and other high-end hard alloy material of ammonium paratungstate rising, ammonium paratungstate zero grade existing national standard has been unable to meet the requirements of high-end hard alloy, not only the impurity and physical of ammonium paratungstate can put forward certain requirements, and part of the production of high-end products enterprises to individual impurity elements proposed particularly stringent requirements.

In the industry, the melting of rare earth, vacuum evaporation and sapphire growth in the field of crucibles, mostly made of tungsten and molybdenum materials. This is due to the fact that tungsten has the characteristics of high melting point and high density. Currently, tungsten, molybdenum and molybdenum alloy crucibles are mostly obtained by powder metallurgy and press working.

Ion exchange method is currently China's tungsten smelting main purification process. At present, strong alkali anion resin 201 x 7 and weak alkaline anion resin are mainly used in the ion exchange process of removing impurity and transforming the tungsten solution.

Scheelite is hard mining and smelting tungsten smelting raw material in the last century, when alkali pressure leaching and scouring process of popularity, production capacity and size of scheelite smelting technology has been greatly enhance, and also further mature. Due to the excessive alkali process, although the leaching process consumes a large part of the base, but after the reaction, residual alkali from crude sodium tungstate solution is very high.