At present, ammonium paratungstate can completely dissolve for 1~4 hours at a temperature of 120~160°C with high concentration of ammonia, some enterprises promote the decomposition of ammonium paratungstate and even through high temperature roasting to get tungsten oxide, then ammonium tungstate solution is dissolved in ammonia water, and some enterprises use sodium hydroxide and other strong alkali to dissolve ammonium paratungstate. The ammonium tungstate solution is regenerated from sodium tungstate solution, the process is complex and costly. Therefore, it is necessary to develop a new low-cost and simple dissolution process for ammonium paratungstate / tungsten trioxide.

Tungsten trioxide is an important type of N type semiconductor oxide. It is widely used in chemical sensors, photocatalysis, energy conversion system and other fields. When WO₃ is used as negative material, its structure and volume will change greatly during charge / discharge process. It destroys the stability of electrode materials and eventually leads to the cyclic performance of the electrode. As a result, the actual capacity is often lower than the theoretical capacity.

Tungsten carbide ceramics are a kind of cermet with high hardness and good wear resistance. However, under traditional technological conditions, the cutting tool made of tungsten carbide ceramics has a short service life at high temperature and is difficult to be applied to high temperature conditions.

After a variety of ore dressing methods have been obtained to a certain grade of tungsten concentrate, it will also produce tungsten fine slime or tungsten refractory materials about 6 to 10% of the total tungsten (WO₃). This material is characterized by low grade of WO₃, high content of major impurity elements such as Mo, Sn, P, As, Si and so on. It is polluted by a variety of mineral processing agents and it can not return to mineral processing and reprocessing. It is necessary to extract tungsten from these refractory tungsten ores by an effective smelting method, which is the only way to improve the utilization ratio of tungsten resources comprehensively.

Tungsten catalyst has been widely used in various oxidation systems due to its excellent catalytic performance. In order to better control production cost and realize large-scale economic production with tungsten catalyst for oxidation reaction, at the same time, in order to save precious tungsten resources, avoid tungsten pollution in the environment and save environmental production, tungsten catalyst must be recycled and reused.

Tungsten and molybdenum alloys have excellent corrosion resistance to liquid zinc and are used to make agitators, pipes and container liners and other components in zinc smelting industry. It can be used as a high temperature component in rocket and missile, the filament of the electron tube, parts and other high temperature materials for the corresponding high temperature conditions.

The electric contact is the key element of the switchgear. It bears the function of conducting current, its performance directly affects the reliability and service life of the switching apparatus. Therefore, the switch electrical contact should have good electrical conductivity, high resistance to welding and corrosion resistance and so on.

Hot spray welding (coating) technology has made rapid progress. There have been high energy plasma spraying, vacuum plasma spraying, supersonic flame spraying, explosive spraying and other new technologies, which can improve the performance of the coating more than the existing oxygen one acetylene flame spraying. Moreover, the hard alloy hot spray welding (coating) powder is convenient to make, no matter which kind of technology is used, the raw material of the spray can not be carbonized.

Tungsten and molybdenum are important non-ferrous metals. They are mainly used in alloy metallurgy, but also widely used in other fields such as chemical industry. As the price of tungsten and molybdenum products has increased in recent years, Recovering APT, tungsten and molybdenum from the slag in the production of ammonium paratungstate (APT) can create better economic benefits for enterprises.

In many countries' energy consumption, building energy consumption accounts for about 30-40% of national energy consumption, while energy lost through glass doors and windows accounts for more than 50% of building energy consumption. About 46% of the solar spectrum is near-infrared light. So, if the transmission of near-infrared light is reduced, electricity used for ventilation and cooling system would be cut down. Therefore, research and development of transparent thermal insulation coatings for energy efficient glass has important practical significance. It can be predicted that transparent thermal insulation coatings have considerable prospects due to their economical and energy-saving significance.