The researchers used tungsten-containing waste to prepare ammonium paratungstate (APT) by leaching, extraction and ammonium sodium double salt method. Therefore, tungsten is effectively recovered. The quality of the prepared APT is higher. And it can further prepare tungsten oxide from APT. This method reduces the process cost by effectively recycling the salt-containing waste liquid generated in the process, which is worthy of vigorous promotion.

Tungsten hexachloride is an important tungsten source for producing tungsten carbide composite catalytic material with platinum-like catalytic properties. For example, some researchers used tungsten hexachloride as the source of tungsten, the stripped montmorillonite sheet as the carrier, and combined the chemical impregnation method with the in-situ reduction carbonization technology to prepare tungsten carbide composite catalytic material - a nanocomposite of tungsten carbide and montmorillonite.

Tungsten hexachloride can be applied for preparing porous WO3 film. Wherein, porous WO3 film is a common gas-sensitive material with excellent gas-sensing performance and gasochromic performance. In addition, it is a typical electrochromic material, and is considered to be one of the most promising electrochromic materials. Tungsten hexachloride (WCl6) is a raw material for preparation of new material that can be used in the chemical industry for catalytic applications, as well as in the glass industry, mainly for the production of surface coatings. So, what is the connection between the porous WO3 film and tungsten hexachloride?

Generally, hydrogen is used to reduce tungsten hexachloride to produce ultrafine tungsten powder. And this method is also known as tungsten hexachloride hydrogen reduction method to prepare ultrafine tungsten powder. It includes preparation of WCl6 and reduction of WCl6 into tungsten powder.

Ammonium paratungstate (APT) is a white crystalline salt with the chemical formula (NH₄)₁₀(H₂W₁₂O₄₂)·4H₂O. It is considered as the most important raw material for the tungsten industry. The majority of tungsten-based catalysts are derived from the reduction of APT.

Tungsten carbide (WC) has excellent properties of high hardness, high strength, high rigidity, good wear resistance, and thermal conductivity. It has wide application files of tools in the metalworking, drilling, and mining industries under severe conditions of high-pressure, high-temperature, and corrosive environment. These mechanical properties is affected by the composition and microstructural parameters including the grain size. It is known that reduction of WC gives a significant improvement in the mechanical properties of the consolidated compacts. So, an efficient and useful production method of nanoscale WC powder is necessary.

The metastable phases of tungsten oxides or oxide bronzes, such as the hexagonal and the pyrochlore-types AxWO₃, have caught much attention because of their one- or three-dimensional opened-tunneling structures. They have been used in the fields of electrochromic devices, humidity and gas sensors and secondary battery.

Non-magnetic tungsten carbide (WC) is a kind of hard alloy material with no magnetism or weak magnetism.  It has excellent properties of high hardness, high T.R.S. and high corrosion resistance.  Its applications include the production of standard parts, cold heading, cold punch, and cold mold. It can also be used in non-magnetic wear parts.

Tungsten carbide-cobalt (WC–Co) is an alloy of hard, ceramic tungsten carbide and the ductile cobalt, often known as cemented carbide. Some of the noteworthy properties of this alloy are strength, hardness, high electrical and thermal conductivity and high malleability and ductility.

Titanium dioxide (TiO₂) might have wider applications in our daily life than you think. It has been applied in daily products, such as paints, toothpaste, food additive, dyes, sun creams, varnishes, textiles, paper and plastics. Another important application of TiO₂ is as a semiconductor. It has the function to purify air, water and soil polluted with various hazardous chemicals.