ferrosilicon 70% alloy

 Ferrosilicon 70% and industrial silicon are silicon alloys in the ferroalloy industry and are 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. After washing, it is mixed with carbonaceous reducing agent and added to submerged arc furnace, and ferrosilicon alloy and metal silicon are obtained by carbothermic reduction under high temperature conditions.

In the production of 70% ferrosilicon alloy and industrial silicon, in order to ensure the gas permeability of the charge, the charge is required to be within a certain particle size range. During the cleaning process of silicon ore, silicon ore with a particle size of less than 20 will be screened to avoid entering the submerged arc furnace and affecting the gas permeability of the charge. Due to the lack of effective utilization methods, this part of silicon ore with a particle size of less than 20 is usually discarded and stored, resulting in waste of silicon ore resources and at the same time increasing the production cost of 70% ferrosilicon alloy and industrial silicon.

The flue gas produced in the production process of 70% ferrosilicon alloy and industrial silicon is rich in a large amount of silica fine powder. my country's ferroalloy factory will produce It micro-silicon powder for every 5t of ferrosilicon produced; it will produce It micro-silica powder for every 3t of industrial silicon produced. According to statistics, my country's ferrosilicon output in 2012 was 4.78 million t, and the industrial silicon output was 1.13 million t. Correspondingly, in 2012 alone, my country will produce 1.33 million t of microsilica. At present, micro-silica fume is mainly used as an additive in concrete, refractory materials and other fields, with small usage and low economic value. As a result, the sales of micro-silica fume is not smooth, and a large number of them are stored in the factory area, which not only occupies the area of ​​the production area, but also brings pollution to the surrounding environment.

At present, there is no better utilization method for the small particle size silicon ore (particle size <20mm) and microsilica powder produced in the production process of 70% ferrosilicon alloy and industrial silicon. A large number of small particle size silicon ore and micro-silica powder are stored in the factory area, which not only causes waste of silicon ore resources and reduces the economic benefits of the factory, but also occupies a large area of ​​the production area and brings pollution to the surrounding environment of the factory area. Threats to the healthy development of enterprises. How to effectively utilize small particle size silica ore and micro silica powder has become an urgent problem to be solved in the ferroalloy industry.