1. Ferroalloy consisting of silicon and iron in the range of 8.0% to 95.0% silicon content, ferrosilicon containing about 50% silicon, mainly used for adding silicon when melting iron in cupola; Ferrosilicon containing about 75% silicon is commonly used as the inoculant and inking agent of cast iron, deoxidizer of steelmaking and silicon additive material; The chemical affinity between silicon and oxygen is very large, and it is easy to combine into silicon dioxide, so ferrosilicon is often used as a deoxidizer in steelmaking (precipitation deoxidation and diffusion deoxidation). At the same time, ferrosilicon can also be used as alloying element additive, widely used in low alloy structural steel, spring steel, bearing steel, heat resistant steel and electrical silicon steel, ferrosilicon is commonly used as reducing agent in ferroalloy production and chemical industry. 2, except for boiling steel and semi-calm steel, the content of silicon in steel should not be less than 0.10%. Silicon does not form carbide in steel, but exists as a solid solution in ferrite and austenite. Silicon can improve the strength of solid solution in steel and the deformation hardening rate of cold working, but reduce the toughness and plasticity of steel. The effect on hardenability of steel is medium Chemicalbook, but it can improve the tempering stability and oxidation resistance of steel, so ferrosilicon is used as alloying agent in steelmaking industry. 3. Ferrosilicon containing about 90% silicon is mainly used for the production of low-iron alloys, but also for the production of silicone and high-activity mineral silicate activator; Crystalline silicon is used in the production of non-ferrous alloys and high purity alloys, and is also an important raw material in the electronics industry. Silicon also has the characteristics of large specific resistance, poor thermal conductivity and strong magnetic conduction. Steel contains a certain amount of silicon, which can improve the magnetic conductivity of steel, reduce hysteresis loss, reduce eddy current loss. Electrical steel contains 2%-3% Si, but requires low titanium and boron content. The addition of silicon in cast iron can prevent the formation of carbides and promote the precipitation and spheroidization of graphite. Ferrosilicon containing barium, zirconium, strontium, bismuth, manganese and rare earth is used as inoculant in cast iron production. 4. High silicon ferrosilicon is a reducing agent for the production of low carbon ferroalloy in ferroalloy industry. Ferrosilicon powder containing about 15% silicon (particle size <0.2mm), used as a weight increasing agent in heavy media beneficiation.
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