Polluted wastewater and anti biotic wastewater are typical toxic and harmful industrial wastewater that are difficult to degrade, such as wastewater from pesticide industry and wastewater from some chemical industry. Because of the high concentration of fungicides in wastewater, which can kill and inhibit the growth of microorganisms, it is difficult to treat this kind of wastewater directly by biotechnology.

Through a simple hydrothermal method, the researchers prepared a wide range of tungsten oxide nanowire gas sensing materials on a large scale, and then provided a tungsten oxide nanowire sensor with high sensitivity, good repeatability and high stability for H₂, CO and NH₃. The operation process is as follows:

Tungsten is an irreplaceable key material in many fields due to its excellent high temperature resistance, high strength and hardness, especially in the fields of national defense industry and aerospace. Compared with the pure tungsten, the aluminum oxide coated tungsten and tungsten alloy can greatly increase the strength of tungsten, refine the grains, reduce the particle size, increase the toughness and tensile strength of the material.

Scheelite is a troublesome raw material in tungsten smelting. After the popularization of alkaline pressure leaching technology in the last century, the smelting capacity and scale of scheelite have been greatly improved, and the technology and process have been further mature. Due to the use of excessive alkali process, although a large part of alkali is consumed in the leaching process, the amount of residual alkali in the crude sodium tungstate solution is still very high after the reaction.