The production of APT in China is mainly ion exchange and extraction. The quality of APT products produced by the two processes is generally the national standard zero grade products. The rest are the first grade or unqualified products of the national standard, and the disqualified products can only be sold at a low price, which not only directly affects the production efficiency of the enterprises, but also affects the quality of the subsequent tungsten deep processing products.

With the continuous development of the hard alloy industry, the requirements of tungsten carbide powder for its raw materials are becoming higher and higher. In China, the demand for hard alloy tools for rock breaking in the mountains is great, and the super coarse cemented carbide has strict requirements for the grain size of WC powder.

In the development of photocatalysts, tungsten oxide as a stable, band structure suitable material can be modified to obtain a visible light response of high activity photocatalyst. Due to the lower valence band position of tungsten oxide, the forbidden band width is variable, it has excellent photoelectric properties, UV - visible light catalysis and other characteristics, so it can replace the old catalyst.

As a new type of tungsten oxide structure, tungsten oxide nano flower has its own unique advantages in performance. The synthesis method of tungsten oxide nano flower is mainly based on the seed planting method, the synthesis of the required conditions are as follows:

Tungsten metal is generally more stable, with a melting point above 3400 ° C and a boiling point above 5700 ° C. In an oxygen environment, when the temperature is above 600 ℃ will be rapidly oxidized to tungsten trioxide. Tungsten oxide materials can be prepared by vacuum thermal oxidation.

Tungsten oxide Nano-flowers in the chemical refers to the tungsten compounds, formed in the micro-level under the flower-like structure, so called nano flower. Tungsten oxide nano flower seed planting method is that the tungsten grain seeds fixedly arranged on the substrate are heated and insulated under certain temperature, pressure and gas atmosphere to realize the local growth of tungsten oxide three-dimensional micro-nano structure.

The high-resolution TEM images of the tungsten oxide nanoball structures grown at tungsten oxide particles were analyzed at a holding temperature of 800 ° C and a holding time of 15 minutes. The microstructure of tungsten oxide nano flower presents a flower-like structure. The structure of the diameter of 3μm-5μm, tungsten oxide nano flower microstructure has a regular geometry.

Tungsten carbide is a compound consisting of tungsten and carbon. It is a black six party crystal with metallic luster and hardness similar to diamond. It is a good conductor of electricity and heat. The tungsten carbide film is coated with a reinforcing phase on the tool, thereby improving the wear resistance, heat resistance and service life of the tool. Tungsten carbide target is the best choice for tool plating.

Ammonium metatungstate is an important tungsten intermediate compound, which has the advantages of high activity, good solubility, convenient source and low price. It is mainly used in the manufacture of petrochemical industry catalyst tungsten carbide and other tungsten compounds, which are important for the production of tungsten carbide catalyst precursor.

PEG is abbreviation of polyethylene glycol. Can be used to improve the electrochromic properties of tungsten trioxide films. PEG-modified tungsten trioxide electrochromic films prepared by sol-gel method have obvious improvements in the optical properties and cyclic voltammetry of the bleached state.