Special Material Silicon Metal 97

The application of silicon metal 97 powder in the photovoltaic industry to produce silicon wafers, in the process of cutting monocrystalline or polycrystalline silicon wafers, will inevitably produce ultra-fine dust, the fineness of the dust is: 5.5-12μm, because the dust of 97 metal silicon powder raw materials is collected from the sedimentation tank, and has been agglomerate, after simple filtration and drying treatment, the moisture content is 25-48%, the silicon content (received base) is 50-73%, and the waste generated in the silicon wafer production process is called silica fume. The specific gravity of the silica sludge after water loss is 0.4-0.6/cm3.

1.At present, the application mode of by-product silica sludge in the photovoltaic industry on the market is: melting and recrystallization into silicon ingot with intermediate frequency furnace, and this process has high standard requirements for silica sludge raw materials, and the elemental silicon content of silica sludge after silicon metal 97 powder drying is 95-98%, which leads to the limited selection of silica smear, and the processing and production of silicon ingot will produce a large amount of dust in the drying process or in the melting furnace smelting process, causing serious dust pollution to the environment, and at the same time, the process production belongs to a high energy consumption and high pollution industry. It conflicts with the current government's advocacy of industrial upgrading, energy conservation and environmental protection.

2.The production method of silicon metal 97 powder is to prepare ordinary silicon metal powder by pre-dehydration or drying, then crushing and drying. Among them, the raw silicon slurry is the ultrafine dust generated by cutting monocrystalline or multicrystalline silicon wafers during the production of silicon wafers, and is obtained by washing and precipitation. Among them, the particle fineness of 97 metal silicon powder accounts for more than 80% in the range of 38-74μm; Water <1%; The mass percentage of impurities such as SiO2 is 2-23%; The mass percentage of elemental silicon is 75-98%. The water content of the raw silica sludge is 25-48%. During the pre-dewatering or drying process, the water content of silica sludge is controlled at 20-35%.

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