At present, in the industrial production of tungsten products, tungsten trioxide is mainly prepared by calcining ammonium paratungstate and then tungsten trioxide is used as a raw material for the production of related tungsten products. However, during the calcination of ammonium paratungstate, different calcination temperatures will have different effects on the physico-chemical properties of tungsten trioxide, which is the product of calcination of ammonium paratungstate.

With the increasing consumption of tungsten resources, high-quality high-grade tungsten ore is also gradually reduced, black and white mixed tungsten ore and low-grade impurities such as high-grade refractory tungsten is gradually flowing to the market, tungsten smelting enterprises have brought many difficulties and pressures.

Tungsten is an important strategic reserve metal, which is one of the few superior mineral resources in our country. Over the years, China's tungsten smelting technology has become more and more mature. The ion exchange method of tungsten smelting is a smelting technology that is firstly developed by China's science and technology workers. The promotion of ion exchange process in tungsten smelting has made the overall level of China's tungsten smelting increase substantially and product quality rise to a higher level.

Tungsten is a non-renewable strategic resource. With the rapid economic development, the demand for cemented carbide, especially tungsten metal materials in machinery manufacturing, geological mining, construction, electronics, military and chemical industries is increasing. Secondary recovery also becomes important.

(4)The tertiary filter press obtained crude sodium tungstate solution 31 plus an appropriate amount of water 311 diluted to obtain a suitable ion-exchange process dilute crude sodium tungstate solution, when from the top down into the ion exchange column in dilute crude sodium tungstate solution, resin and sodium tungstate solution column in tungsten adsorption.

Tungsten, a refractory non-ferrous metal, is also an important strategic resource that has been widely used due to its excellent properties such as high melting point, high hardness, ductility, wear resistance and corrosion resistance. Ammonium paratungstate is an important tungsten primary product , its quality directly affects the quality of tungsten deep processing products. High purity ammonium paratungstate refers to ammonium paratungstate in which the total amount of impurities can be controlled within 70 ppm, that is, ammonium paratungstate with a low impurity content.

With the development and utilization of high quality tungsten and molybdenum resources, existing tungsten and molybdenum resources increasingly complex composition, tungsten and molybdenum symbiotic ore is become more and more. Especially in recent years with the increasing value of tungsten and molybdenum. The recovery of molybdenum or tungsten in tungsten resources is becoming more and more important.

High density tungsten alloy is a kind of tungsten based (mass fraction of tungsten or tungsten content is usually 80% ~ 97%), and adding Ni, Fe, Co, Cu, Mo, Cr and other elements and the composition of the alloy, its density is as high as 16.5 ~ 19.0g/cm³, which had been known as high density tungsten alloy high proportion tungsten alloy, heavy alloy.

Pyrochlore-type tungsten oxide take twisted WO₆-octahedrons as the structural unit, through the angular point of W-O rigid skeleton to form a layered structure with a circular hole. Due to its special physical and chemical properties, it is widely used in the fields of catalysis, sensing, electronics and other materials science.

Cemented-carbide grinding material not only contains a considerable amount of tungsten, but also a small amount of cobalt and nickel and other valuable metals, which can realize comprehensive utilization of secondary resources of tungsten if it is recycled. Currently, as for recovery process of the metal of such waste-tungsten materials there are some common methods, such as oxidation-alkali leaching, saltpetre melting, sodium-sulphate-melting, and so on. The saltpetre smelting and sodium-sulphate-smelting methods has the disadvantages of high-energy consumption and impurities, so oxidation - alkali leaching method is generally used.