(1) Used as a deoxidizer and alloying agent in the steelmaking industry. In order to obtain steel with qualified chemical composition and ensure its quality, deoxidation must be carried out in the later stage of steelmaking. The chemical affinity between silicon and oxygen is high, so ferrosilicon is a strong deoxidizer for precipitation and diffusion deoxidation in steelmaking. Adding a certain amount of silicon to steel can significantly improve its strength, hardness, and elasticity. Therefore, ferrosilicon is also used as an alloying agent in the smelting of structural steel (containing 0.40-1.75% silicon), tool steel (containing SiO.30-1.8%), spring steel (containing SiO.40-2.8%), and silicon steel for transformers (containing 2.81-4.8% silicon). In addition, in the steelmaking industry, silicon iron powder is often used as a heating agent for steel ingot caps to improve the quality and recovery rate of steel ingots due to its ability to release a large amount of heat at high temperatures

(2) Used as an inoculant and spheroidizer in the cast iron industry. Cast iron is an important metal material in modern industry. It is cheaper than steel, easier to melt and smelt, and has excellent casting properties and much better shock resistance than steel. Especially ductile iron, its mechanical properties are comparable to or close to those of steel. Adding a certain amount of ferrosilicon to cast iron can prevent the formation of carbides in iron, promote the precipitation and spheroidization of graphite. Therefore, in the production of ductile iron, ferrosilicon is an important inoculant (helping to precipitate graphite) and spheroidizing agent

(3) Used as a reducing agent in the production of ferroalloys. Not only is there a high chemical affinity between silicon and oxygen, but the carbon content of high silicon ferrosilicon is also very low. Therefore, high silicon ferrosilicon (or silicon alloy) is a commonly used reducing agent in the production of low-carbon ferroalloys in the ferroalloy industry

(4) Other uses. Finely ground or atomized silicon iron powder can be used as a suspended phase in the mineral processing industry. It can be used as a coating for welding rods in the welding rod manufacturing industry. High silicon ferrosilicon can be used in the chemical industry to manufacture products such as silicone