The main oxides of fly ash in China's thermal power plants are SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2 and so on. With the development of electric power industry, the discharge of fly ash from coal-fired power plants is increasing year by year, and it has become one of the industrial wastes with large displacement in China. If a large amount of fly ash is not treated, it will produce dust and pollute the atmosphere. If discharged into the water system, it will cause the silting of the river, and the toxic chemicals in it will also cause harm to human and biological. But fly ash can be used as resources, such as as an admixture of concrete.

iron dust, which is an aggregate of iron particles with a size of less than 1mm, is the main raw material for powder metallurgy. According to the particle size, it is traditionally divided into five grades of coarse powder, medium powder, fine powder, micro-fine powder and ultra-fine powder. Iron powder composed of particles with particle size in the range of 150~500μm is coarse powder, particle size in the range of 44 ~ 150μm is medium powder, 10 ~ 44μm is fine powder, 0.5~10μm is extremely fine powder, and less than 0.5μm is ultra-fine powder.

Fly ash is a multi-purpose material, which is not only widely used in the field of building materials, but also plays an important role in environmental protection and industrial fields.

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