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 and oxygen into silica, ferrosilicon is often used as a deoxidizer in steelmaking. At the same time, due to the large amount of heat released during the generation of SiO2, deoxidation is also beneficial for increasing the temperature of molten steel. Meanwhile, ferrosilicon can also serve 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 torch steel, silicon iron is used for precipitation deoxidation and diffusion deoxidation. Brick cast 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. Generally, 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 siliceous alloys are used as reducing agents in the production of low-carbon ferroalloys in the ferroalloy industry. Adding silicon iron to cast iron can serve as an inoculant for ductile iron, prevent the formation of carbides, promote graphite precipitation and spheroidization, 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 in the electrical industry to prepare semiconductor pure silicon, and in the chemical industry to manufacture silicones and other materials.

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

Melting point: 1300 ℃ for 75FeSi

Ferrosilicon contains small amounts of phosphorus metal compounds, such as calcium phosphide. When transported by vehicle or stored in warehouses, if it is damp, it can release phosphine, causing poisoning to people inside or around the warehouse. When phosphine poisoning is severe, it can cause death.