Selective Catalytic Reduction (SCR) is a process for the reduction of NO_x from the atmosphere to N₂ and H₂O under the action of catalysts. At present, in most thermal power plants in China, W-V-Ti composite material is the main catalyst treatment material, in which titanium acts as a carrier, vanadium acts as an activator and tungsten acts as a catalyst.

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.

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.

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!