In China's tungsten reserves, scheelite is 70.4% and wolframite accounts for 29%. But for a long time, scheelite is seldom used because of its complex composition, low grade and difficult mining. With the development of technology, more and more scheelite mining methods are applied.

Heteropoly acids are heteroatom (such as P, Si, Co, etc.) oxyacids and polyatomic (such as Mo, W, V, etc.) oxyacids which are formed by condensation and dehydration according to a certain structure. They have strong acidity and redox properties, and are widely used in the field of catalysts. Phosphotungstic acid is a kind of common heteropoly acid, which has strong acidity, excellent conductivity and strong oxidation performance. It has been widely used in the field of photocatalytic degradation of organic wastewater.

At present, China's wire cutting industry can be said to be "a group of independent warlords". There are many well-known electric discharge machine tool manufacturers, as well as some concentrated industrial clusters of wire cutting machine tools. However, why China's line cutting industry has always taken "medium-speed wire "as the mainstream? Now, check it out with us!

In recent years, with the continuous development of China's manufacturing industry, manufacturers' requirements for machining accuracy have been continuously improved, among which, the need for precisive linear cutting machine is the most urgent. In wire-cutting industry, 

The tungsten oxide heat-insulation glass film is a kind of material that add nano-tungsten oxide component during the producing process base on the traditional film, which owns good heat insulation performance. And the application of metal oxide coating makes the film have outstanding barrier function performance on the ultraviolet and infrared rays from the sun, which is more effective than the traditional automotive glass film, and has get more attention from the market gradually.

Tungsten has three kinds of stoichiometric oxide which are WO2, W2O5 and WO3. WO3 has many isomers which possesses good electrical and optical property. It has been widely applied in the fields of manufacturing optical devices, electrochromic smart window, field emission display, gas sensor, humidity and temperature sensor, catalyst, solar photovoltaic chemical cell and water separation hydrogen production.

People's aesthetic requirements for modern architectural design are getting higher than before, and the nice combination of aesthetics and functions of the architecture owns to the emergence of glass curtain wall, and get the favor of architects. The glass curtain wall is simple, luxury, and modern, in addition, this architectural material can reflects the surrounding scenery very well which could show a good decorative effect. The glass curtain wall combining the exterior wall with the windows, which could reduce the weight of the building itself. And this kind of structures has the advantages of light weight, easy installation and the others during the process of construction.

As people know, many magnificent natural phenomena on the earth benefit from the distribution of solar energy on the surface of the earth, seasonal changes, climate differences, ocean currents, etc., almost all the earth's environment is inseparable from the influence of solar thermal radiation. At the same time, the energy of solar radiation is the source of power for the development of human society. From the ancient time, human beings keep their labor steps with the dawn and dark, in the modern civilization, people use solar power to generate electricity. The sun gives us almost everything we need. The whole world will become lifeless if the earth were without the sun.