In the process of scheelite flotation, a large amount of sodium silicate was added as gangue inhibitor or dispersant. The presence of sodium silicate makes it difficult to clarify tailings water, especially for a large number of fine suspended solids to settle under gravity.

In the traditional recovery and treatment of waste tungsten powder, the powder waste tungsten powder is first oxidized into tungsten oxide, and then tungsten oxide is dissolved by alkali to form tungstate. In this way, not only the process is complex, but also the efficiency is very low. The oxidation rate of waste tungsten powder is usually less than 50%. Unoxidized tungsten powder needs to be recycled by other methods again.

Tungsten alloy blank refers to tungsten alloy semi-finished products of various shapes. The tungsten alloy blank is further processed to prepare various tungsten alloy products. The main categories include: tungsten alloy billet, tungsten alloy bar, bar, cube, brick, block and tungsten alloy plate, etc. The common tungsten alloy blanks are mainly castings, forgings, profiles, welding parts and so on.

Tungsten is one of the metals with the highest melting point and the most common arc electrode material. Tungsten electrode material is mainly used in tungsten argon arc welding. It is generally used as cathode part in the process of argon arc welding. It is almost suitable for welding all metal materials.

With the rapid development of economy, the demand for tungsten metal materials is increasing. Almost all the metal elements constituting cemented carbide materials are rare elements. It is increasingly urgent to make comprehensive use of various tungsten resources. Over the years, the industry has done a lot of work on the comprehensive utilization and regeneration of tungsten resources. At present, the recovery and utilization of waste tungsten accounts for 20% of China's tungsten consumption. The regeneration and utilization of tungsten resources plays an important role in the national economy.

Due to the defects of concentrated sulfuric acid catalysis, scholars at home and abroad have successively used strong acid cation exchange resin, heteropoly acid, inorganic salts, solid superacid as catalysts to prepare tributyl citrate. Comparing various methods, chemists believe that Heteropoly salts with Keggin structure are the best catalytic scheme. For example, phosphotungstic acid with Keggin structure is an oxygen-containing polyacid bridged by heteroatom P and coordination atom W through oxygen atom coordination unit. It has both the function of acid catalysis and oxidation catalysis. It is a protonic acid with uniform strength and high catalytic activity.

Epoxy compounds are important intermediates in organic synthesis and chemical raw materials. The ternary ring of epoxy compounds has special tension, so it is easy to synthesize many substances needed by people through selective ring opening or functional group conversion. Epoxy compounds have been widely used in many fields such as fine chemical industry, petrochemical industry, organic synthesis, pharmaceuticals, spices and so on.

Since Andre Geim and Konstantin Novoselov won the Nobel Prize in Physics for their research on graphene in 2010, graphene-like transition metal sulfides MS₂ (M=Mo, W, Nb, Ta) have attracted wide attention due to their unique physical and chemical properties.

Tungsten oxide is an important semiconductor material. It is widely used in electrochromic devices, gas chromic devices, photovoltaic cells and other photovoltaic devices.

Due to the continuous consumption of fossil fuels and the increasingly prominent environmental problems, the search for clean and sustainable use of new energy has become an increasingly important topic. Among many new energy sources, hydrogen energy has become a research hotspot due to its high energy density, clean (water products) and sustainable utilization.