Tungsten trioxide is recognized as an excellent electrochromic material. It has excellent properties in electrochromic, catalytic and gas sensitivity. Tungsten bronze, a composite oxide of tungsten bronze, generally refers to metal oxides with deep metallic luster, and is usually metal conductors or metal semiconductors.

In the conventional preparation of phosphotungstic acid, a large amount of ether is used to extract the reaction liquid of phosphotungstic heteropoly acid, and a yellowish transparent oily ether-phosphotungstic heteropoly acid is obtained. The solid product of yellowish phosphotungstic heteropoly acid is obtained by blowing ether with air. Moreover, the ether used in the whole extraction process is difficult to recycle, resulting in waste of resources and environmental pollution.

With the increasing consumption of petroleum resources, the new synthetic route of preparing high value-added liquid chemicals and other organic chemicals with natural gas as an alternative energy source has attracted great attention from all over the world. The preparation of syngas by partial oxidation of natural gas is an important intermediate link in the realization of natural gas conversion, and the research and development of efficient catalysts is the key.

Tungsten and molybdenum are two non-renewable strategic mineral resources. Because of their unique properties, they are widely used in steel, military, aerospace, electronics, electrical appliances and chemical industries. With the development of social economy, the demand for tungsten and molybdenum is increasing, and the reserves of tungsten and molybdenum resources are decreasing sharply. However, there are a large number of poor, fine and miscellaneous refractory tungsten and molybdenum resources in our country. For refractory tungsten and molybdenum ores, especially for tungsten and molybdenum ores with high oxidation rate, no effective recovery method has been found.