The most common method for the production of ammonium para tungstate in tungsten smelting is ion exchange. Ammonium chloride is used as a desorption agent in almost all kinds of tungsten smelting. In order to prevent the production of ammonium para tungstate crystal during the process of desorption, a proper amount of ammonia water must be added to the desorption agent. Therefore, liquid ammonia is a necessary auxiliary material.

The super coarse tungsten powder is the main raw material for the production of coarse grain cemented carbide, and its downstream products are widely used in mining tools, stamping dies, oil drilling and hard surface materials and so on.

At present, the main equipments for producing tungsten powder are propulsion reduction furnace and rotary reduction furnace. The feeding way of a propelled reduction furnace is to place tungsten oxide in a boat, feed and discharge through the the push rod. The feeding mode of the rotary reduction furnace is to put tungsten oxide into the inlet of the reduction furnace and use its own gravity to flow itself into the furnace tube, which has a high requirement for the fluidity of tungsten oxide.

At present, the cemented carbide under submicron is prepared by mechanical mixing, chromium powder or chromium carbide is added to the ultrafine tungsten powder, and cemented carbide is prepared by carbonization and pressing sintering after mechanical mixing. The uneven distribution of the added grain growth inhibitors will lead to the abnormal growth of "WC grain", which seriously affects the performance of the cemented carbide and restricts the development of the superfine cemented carbide.

In order to improve the stability of magnetron launch, carbonization of magnetron made of thorium tungsten wire is required.

The large single heavy tungsten plate tungsten target material is mainly used for the coating of the photovoltaic element substrate. The tungsten plate used in this field has a large size, the weight of the single plate is 80 to 150 kilograms, and it has the characteristics of high temperature resistance and good compactness.

In the process of the production of ammonium para tungstate by ion exchange, a large amount of waste water will be produced. The wastewater mainly contains tungsten, alkali, chloride ion, ammonia nitrogen, COD, a small amount of arsenic, fluoride ions and other elements. Because of the complexity of the components in the waste water, finding a system and method for comprehensive treatment of tungsten smelting wastewater will help enterprises to save energy and reduce emissions.

The preparation of high quality cemented carbide has strict requirements for the grain size of tungsten carbide powder, which not only requires the microstructure of WC powder well, the crystallization is complete, the granularity is coarse and uniform, but the degree of aggregation can not be too high. This is also the reason why there are few high quality coarse grained cemented carbides made from recycled tungsten in China.

For many years, researchers have been innovating and improving the preparation methods of ammonium tungstate solution. Some scholars have invented a method of producing high purity tungstate from the decomposition of tungsten ore.

Tungsten has high altitude, high corrosion resistance and excellent surface adhesion, which makes tungsten titanium (W-Ti) an ideal solution to prevent the dense layer of the diffusion of foreign atoms. In the metallizing process of semiconductor chip, the tungsten titanium alloy containing 10wt% titanium is often used as a diffusion barrier and bonding layer to separate semiconductors and metallized layers, such as aluminum and silicon or copper and silicon.