With the awareness of the scarcity of resources has been widely recognized, to carry out comprehensive recycling of resources has become a consensus, therefore, the vast majority of tungsten smelting and processing enterprises have paid attention to the comprehensive recycling of resources and the gradual implementation of circular economy mode. For tungsten smelting processing enterprises, the control of effluent pollution treatment, and increase the total recycle of tungsten smelting enterprises is the focus of work.

CaWO₄ is generally affirmative scheelite crystal, a plate or crystal, there are dense, brittle, hardness is 5 ~ 5.5, density of 5.8 ~ 6.2g / cm³, no magnetism. Most of the scheelite deposit in China is a skarn type, with a fine granularity, often associated with or symbiotic with a variety of nonferrous metals such as molybdenum and bismuth, at the same time, there are calcium-bearing gangue similar to the flotation of tungsten ore, so flotation is an effective method to recover fine and even fine-grained scheelite.

With the technological progress of the electric light source and the renewal of the lighting products, the gas discharge lamp has been used more and more widely. Gas discharge lamp electrodes are mostly made of tungsten rods and tungsten wire, these materials include thorium tungsten, doped tungsten, lanthanum tungsten, barium tungsten, rare earth tungsten, pure tungsten, etc., among them, the purity of doped tungsten and pure tungsten is higher, and the content of tungsten can reach 99.95% (3N5) and 99.9999% (4N). 

Ultrafine cemented carbide is a tool material developed in recent years, mainly based on ultra-fine WC powder and adding appropriate binder (such as Co) and grain growth inhibitor to produce high hardness, high wear resistance and high toughness cemented carbide materials. Its performance is higher than that of conventional cemented carbide. It has shown more and more extensive application prospects in difficult-to-process metal material tools, miniature drill bits in the electronics industry, precision molds, and dental drills.

In China, NaOH⁺ phosphate is generally used to decompose scheelite or wolframite in tungsten smelting. Although the subsequent ion exchange process can remove most of the phosphorus, if the decomposition of sodium tungstate solution contains too much residual phosphorus, the concentration of phosphorus in ammonium tungstate solution obtained by ion exchange desorption is often higher than that of technical requirements, resulting in excessive phosphorus in ammonium paratungstate (APT).

Beneficiation wastewater reuse refers to the tailings water concentration plant to reach production after repeated use of the standard, it is an important index of the requirements of environmental protection in mineral processing plant. At present, most of the ore mines have a large amount of waste water and require a large amount of cost treatment. At the same time, there is also a shortage of water resources. Therefore, more and more concentrator plants are being used for wastewater reuse, but the effect obtained is not obvious.

Tungsten trihydrate seed hydrothermal method, also known as high temperature solution method, including temperature difference method, cooling method. To improve the growth rate of tungsten oxide crystals, seed water and heat-assisted method generally uses dual temperature zone high pressure reactor. Mainly rely on the solution in the container to maintain the temperature convection to form a supersaturated state.

In 1969, for the first time, some scholars found the electrochromism of amorphous tungsten trioxide. Due to its high electrochromic color contrast, good cycle stability and good thermal stability, tungsten trioxide has become the most studied and commercially available inorganic electrochromic material in recent years.

Tungsten trioxide electrodeposition method refers to the tungsten oxide from its aqueous solution of compounds, non-aqueous solution or molten salt electrochemical deposition process. Metal electrolytic smelting, electrolytic refining, electroplating, electroforming process foundation.

Tungsten trioxide thin film nano-spray method to solve the hydrothermal method for the preparation of large-area film and electrodeposition deposition film stability problems. High-quality molybdenum-doped tungsten trioxide nanoparticles were prepared by a simple, green solution doping technique. These nanoparticles can be uniformly dispersed in water to form a stable nano-ink.