Waste Tungsten Bar and Tungsten Powder

Tungsten powder is in the form of powder of tungsten metal, which is the raw material of manufacturing process of wolfram, tungsten alloy and tungsten products. Pure tungsten powder can be processed into wire, rod, tube, plate and any other shapes. If wolfram powder mixes with other metal powders, it can be made into a variety of tungsten alloys, such as tungsten-molybdenum alloy, tungsten-rhenium alloy, tungsten-copper alloy and high density tungsten alloy. Another important application of tungsten powder is to make tungsten carbide powder, and then the produce cemented carbide tools, such as lathe tool, hobbing, drilling bit and die. Pure tungsten bar includes tungsten rod, tungsten steel bar, tungsten rod, tungsten sintered bars and more, which is mainly used to found ingredient of material, cutter and heads, tungsten wire for lights instruments, electric contact points and conductor of heat, crankshaft and cylinder barrel of advanced automobile, ingredient of kinds of heat-resistant steel. 

People are used to abstract the metal from the ore, however, recycling and reproduce discarded metal can not only save energy, reduce costs, but also help to improve the ecological environment. Therefore, this method has attracted serious concern in the world. Especially in Japan, the country takes the project as the development of "second mining", which contains tungsten steel scrap, tungsten metal and its alloy scrap, cemented carbide scrap, grinding debris, dust and other secondary raw materials. Many countries have begun to set up a special department in charge of recycling the waste tungsten. From example, the Soviet Union has established a research institute in charge of the recovery of non-ferrous metal scrap. Through a series of industrial tests, a tungsten-containing waste treatment process developed by the institute is considered as the most promising step. In recent years, many countries are researching and developing how to deal with the waste tungsten bar. The ways to handle waste wolfram bar and reproduce wolfram include electrolytic process, zinc process, high temperature oxidation, chemical dissolution and chlorination pulping process.

It is proved that waste end block of wolfram powder can be used as a raw material instead of industrial wolfram powder, and it can produce the same quality of ultrafine particles. This can greatly reduce the industry costs. What’s more, the most important is the reasonable reuse of resources that can improve evils caused by the rapid development of industry.

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