Ferrosilicon is an iron alloy composed of iron and silicon. Ferrosilicon is an iron silicon alloy made by smelting coke, steel shavings, quartz (or silica) as raw materials in an electric furnace. Due to the easy synthesis of silicon dioxide from silicon and oxygen, ferrosilicon is often used as a deoxidizer in steelmaking. At the same time, the generation of SiO2 releases a large amount of heat, which is beneficial for increasing the temperature of molten steel while deoxidizing. At the same time, ferrosilicon can also be used as an alloying element additive and is widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel, and electrical silicon steel. Ferrosilicon is commonly used as a reducing agent in ferroalloy production and chemical industry. Ferrosilicon is widely used in the steel industry, casting industry, and other industrial production.

    Ferrosilicon is an essential deoxidizer in the steelmaking industry. In Jugang, ferrosilicon is used for precipitation deoxidation and diffusion deoxidation. Brick iron is also used as an alloying agent in steelmaking. Adding a certain amount of silicon to steel can significantly improve its strength, hardness, and elasticity, increase its magnetic permeability, and reduce the hysteresis loss of transformer steel. General steel contains 0.15% -0.35% silicon, structural steel contains 0.40% -1.75% silicon, tool steel contains 0.30% -1.80% silicon, spring steel contains 0.40% -2.80% silicon, stainless acid resistant steel contains 3.40% -4.00% silicon, heat-resistant steel contains 1.00% -3.00% silicon, and silicon steel contains 2% -3% or more silicon.

    High silicon ferrosilicon or silicon alloys are used as reducing agents in the production of low-carbon ferroalloys in the ferroalloy industry. Silicon iron added to cast iron can serve as an inoculant for ductile iron, and can prevent the formation of carbides, promote the precipitation and spheroidization of graphite, and improve the properties of cast iron.

    In addition, silicon iron powder can be used as a suspended phase in the mineral processing industry and as a coating for welding rods in the welding rod manufacturing industry; High silicon ferrosilicon can be used to prepare semiconductor pure silicon in the electrical industry, and can be used to manufacture silicone in the chemical industry.

    In the steelmaking industry, approximately 3-5 kg of 75% silicon iron is consumed for every ton of steel produced.