Special Material Ferro Silicon 70

Ferro silicon 70 alloy and industrial silicon belong to the silicon alloy in the ferroalloy industry, which is widely used in steelmaking, casting, non-ferrous metals and other industrial production. The production of 70 ferrosilicon alloy and industrial silicon is based on silica as raw material, which is mixed with carbonaceous reducing agent and added to the submerged arc furnace after washing, and the ferrosilicon alloy and silicon metal are obtained by carbonaceous reduction under high temperature conditions.

1.In the production of 70 ferro silicon alloys and industrial silicon, in order to ensure the air permeability of the charge, the charge is required to be within a certain particle size range. During the silica ore cleaning process, the silica ore with a particle size of <20 will be screened to avoid entering the submerged arc furnace and affecting the air permeability of the charge. g in a waste of silicon ore resources, and at the same time increasing the production cost of 70% ferrosilicon alloy and industrial silicon.

2.The flue gas generated in the production process of 70 ferro silicon alloy and industrial silicon is rich in a large amount of silica powder, which is collected by dust removal equipment to obtain silica powder with a silica content of 80 or 5%. For every 5t of ferrosilicon produced by ferroalloy plants in China, it silica fume will be produced; For every 3t of industrial silicon produced, it microsilica fume will be produced. According to statistics, China's ferrosilicon output in 2012 was 4.78 million tons, and the output of industrial silicon was 1.13 million tons. Correspondingly, in 2012 alone, China will produce 1.33 million tons of silica fume. 

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