In industry, the main mineral containing tungsten for wolframite and scheelite. Although the wolframite reserves less, the total reserves of less than 30%, but the wolframite resources easy to mining, smelting difficulty is small, it has inherent advantages compared with scheelite. The processing of wolframite are mainly soda high pressure leaching method, NaOH decomposition method and hydrochloric acid decomposition method.

When testing the cyclic voltammetry of a tungsten trioxide film, the prepared sample is typically subjected to cyclic voltammetry using a self-made three-electrode system in solution. The cyclic voltammetry curve of tungsten trioxide thin film is shown in the figure.

Tungsten trioxide film formation and growth is a relatively complex issue. First of all, the surface of the tungsten trioxide film, foreign atoms to reach the surface of the tungsten trioxide substrate, the need for further adsorption, atom drifting, atomic binding, the formation of a critical nucleus. Eventually we can grow into the tungsten oxide film we need.

Special tungsten trioxide film is amorphous. Amorphous tungsten trioxide film surface is relatively flat, particle distribution is also very uniform. Tungsten trioxide thin film due to the higher degree of undercooling and lower atomic diffusion capacity, resulting in the atomic nucleation free energy will have a certain decline. As a result, the number of cores formed in this case will increase by a certain amount and it is relatively easy to form a relatively thin and uniform amorphous thin film structure.

Pyrochlore tungsten oxide as an important tungsten compound form, may be used for gaschromic, electrochromic, photochromic materials, catalysis, batteries and other fields. Pyrochlore tungsten oxide preparation method using soft chemical synthesis method and hydrothermal synthesis method.

High density tungsten alloy is a kind of alloy material consisting of tungsten (Ni), copper (Cu), iron (Fe), cobalt (Co), molybdenum (Mo) and chromium (Cr) and so on. It is also called high density tungsten alloy or heavy alloy, which is composed of tungsten matrix material (containing tungsten content of 85% ~ 99%).

Tungsten and molybdenum often coexist together, therefore, often contain high amounts of molybdenum in the tungsten ore, tungsten containing more than 0.5% interferes with the determination of molybdenum in tungsten ore will influence, if Mo is not removed, can not accurately determine the content of tungsten trioxide.

Tungsten alloy doped with silicon, aluminum and potassium is a tungsten resistant alloy with high temperature resistance. In the production process through to tungsten powder doped with trace silicon (Si), Al (AL), potassium (K) oxides, and volatile oxide dopants in the billet during the sintering process of Si and Al, K elements in the form of bubbles remaining in the grain interior. 

Tungsten is an important national strategic resource as well as a non-renewable resource. The transition to a resource-saving and environment-friendly mode of development is also vigorously advocated and supported by the state in recent years. Therefore, the recovery of ammonium paratungstate from tungsten waste is nowadays many enterprises produce tungsten the main method of resources.

A quantum dot light-emitting device is a substance composed of a hole transport layer, a light-emitting layer, and an electron transport layer. Compared with the traditional light-emitting devices, quantum dot light-emitting devices with self-luminous, high brightness, wide viewing angle, fast response, low energy consumption and many other advantages. Quantum LED is expected to become the next generation of flat panel displays, has a very broad application prospects.