China is the largest tungsten producer, exporter and consumer in the world. Its reserve accounts for 58% of the total in the world, and production accounts for 82%. Supply 82% tungsten products to the whole world with 58% of reserve, the sustainable resource becomes a serious problem. 

Tungsten is a scarcity strategic resource, irreplaceable and non-renewable. World tungsten import and export volume and scale have been stable for a long time. 

Melting point of tungsten is 3410℃, boiling point is 5900℃, it evaporates slowly under high temperature, has low thermal expansion coefficient, high hardness, high density, good electric emission property. 

Tungsten metallurgy products mainly include ammonium paratungstate, tungsten trioxide, blue tungsten oxide, violet tungsten oxide, tungsten powder, ammonium metatungstate, tungsten carbide powder. Ammonium paratungstate is the main intermediate product and the raw material in tungsten metallurgy products.

Tungsten is rare element which only accounts for 1.3╳10^-6 in the geological belt. Over 20 kinds of tungsten mine are discovered, tungsten concentrate and tungsten scheelite are the most widely spread and has economic value, as well as mixed tungsten ore. 

Tungsten is a kind of wide distributed rare metal and accounts for 0.001% in the earth crust. More than 20 kinds of tungsten ore has been discovered, among which tungsten concentrate, tungsten scheelite and metal mixed ore has economic value for exploration.