Violet tungsten oxide is suitable for the preparation of tungsten powder with small granularity and good properties, so as to make high-quality cemented carbide. It has high chemical activity and high rate of hydrogen reduction.

How to efficiently prepare w-v-cu composite materials is different from other vanadium oxides because of its rapid and sudden phase transition. The temperature of phase transition is 68 ℃, which can change reversibly from monoclinic system to tetragonal system, making its physical properties such as resistivity, optical transmittance and permeability change greatly. This characteristic makes it have a great prospect in intelligent switch, electronic device and photoelectric equipment. The results show that tungsten can effectively reduce the phase transition temperature of vanadium dioxide, and copper can improve the conductivity of vanadium dioxide.

In order to extract tungsten from tungsten minerals, at present, China's tungsten metallurgy industry mostly adopts the alkaline smelting system. After high-pressure leaching of sodium tungstate solution, ion exchange is carried out and apt is extracted by evaporation crystallization. At present, there are two outstanding problems in this process that have not been effectively solved: first, the wastewater discharge is large. Second, the discharge of waste salt is large.

At present, due to the increasingly high energy shortage and environmental pollution caused by the rapid development of industry, the demand for clean energy and clean technology that can effectively use solar energy is becoming more and more urgent. The photocatalytic technology is environmentally friendly, energy-saving, mild in response conditions and The advantages of secondary pollution show good application prospects. Among many photocatalytic materials, Bi2WO6 is a kind of visible light photocatalyst with many researches and good photocatalytic activity.