Tungsten trioxide (WO₃) is a n type semiconductor material with a band gap of about 2.5 to 2.9eV and absorbable wavelengths of 410 to 500nm. The ordered nanostructured tungsten trioxide has the properties of nanomaterials and prominent quantum effects.

A method for the synthesis of methyl laurate by cyclic use of cerous phosphotungstate catalyst is proposed. This method does not produce acid waste water and solid waste. It is a green synthesis process. The steps of synthesis are as follows:

Heteropoly acid is one of the most active catalysts in acid catalytic reaction and redox reaction. The hydration and esterification of olefin, the etherification of epoxides, the condensation reaction of olefin and aldehyde, alkylation, alkene epoxidation, alkyl alkylation, etc. have good catalytic properties. In heteropoly acid, phosphotungstic acid H₃PW₁₂O₄₀ nH₂O is the most widely used, its purity affects the catalytic system directly. Therefore, it is especially important to prepare high purity phosphotungstic acid.

Copper and tungsten compounds are symbiosis in a mineral deposit. Such deposits are called copper tungsten deposits. The recycle method of copper and tungsten ores generally adopts the principle process of selecting tungsten after copper sulphur first, and reduces the loss of tungsten in copper concentrate and sulphur concentrate as far as copper and sulfur are recovered as much as possible.

Tungsten carbide tungsten carbide is a brittle material, its hardness and strength are a pair of contradictions, increasing the hardness of the alloy will lead to the decrease of strength, and on the contrary, the strength of the alloy leads to the decrease of hardness. In recent years, studies have shown that for a WC-Co cemented carbide with a given composition, when the average grain size of the tungsten carbide WC phase decreases below 1 m, the hardness and strength of the hard alloy can not only be increased at the same time, but the increase will increase with the further decrease of the grain size of the WC, so most of the WC-Co nanometers are used at present. Composite powder is used as raw material to prepare superfine cemented carbide.

Ammonium tungstate is mainly used for the preparation of WO₃ and W powder. At present, the main methods of producing ammonium tungstate are neutralization, evaporation, extraction and ion exchange. The main process of preparing ammonium tungstate is evaporation method.

The solid fatty acids derived from the active and plant oils are mainly composed of stearic acid and palmitic acid. The boiling points of the two acids are high and are not easy to be separated. The two acids are converted to methyl stearate and palmitic acid methyl ester to reduce their boiling points and be easy to separate and be used as products. Methyl stearate is used for surfactants, lubricants, plastic antioxidants, developing agents, and coolants. It is an important intermediate for fine chemical products and therefore has a wide range of development prospects and application values.

Alkaline sodium tungstate solution is widely used in industry to extract tungsten from tungsten containing materials by sodium hydroxide leaching or soda high-pressure leaching. Sodium tungstate solution contains sodium hydroxide or sodium carbonate, or sodium hydroxide and sodium carbonate, in addition to sodium tungstate. In addition, coarse sodium tungstate solution also contains a small amount of harmful impurities such as phosphorus, arsenic, silicon and tin.

One of the main uses of nano tungsten powder is to prepare ultra-fine tungsten carbide, but it has also become an indispensable material in many high-tech fields. For example, the micro electronics industry, fine chemical industry, surface technology, aerospace industry, nuclear industry and other fields also have great demand for nano tungsten powder.

China has a unique mineral resource containing antimony, tungsten and molybdenum. The antimony concentrate produced by the beneficiation usually contains a certain amount of tungsten and molybdenum. This kind of antimony sulfide concentrate containing tungsten and molybdenum can usually be directly treated with wet method.