Tungsten disulfide is the smoothest new solid lubricant in the current thousands of materials. It has been widely used in the automotive industry, and the benefits to the car are numerous.

Tungsten disulfide is a typical transition metal chalcogenide. It belongs to hexagonal crystal system. It has a strong S-W-S covalent bond in the layer and a weak van der Waals force between the layers. The thickness of the single layer is about 0.65 nm. Monolayer tungsten disulfide nanosheets can be obtained by stripping or lithium ion intercalation.

There must be a knife in the engraving, and the engraving knife is an extremely important tool for engraving the seal. For the primary printing friends, the tungsten steel knives can be said to be more suitable for quick start "knife pen". It can be your partner on the road, accompanying you and growing up with you. For the old Indian friends, it is like an old friend. Of course, I believe that the Indian friends also know that the engraving also needs to work hard in terms of lettering, law, rules, and knives.

At present, the self-developed ion exchange process is widely used in the production of ammonium paratungstate (APT) in China. Its advantages are stable product quality and easy operation. However, the major disadvantage of this process is that it uses a large amount of water and consumes more than 100 tons of water per ton of APT production. Therefore, the treatment of smelting wastewater is a very headache.