(1) Used as deoxidizer and alloying agent in the steelmaking industry. In order to obtain steel with qualified chemical composition and ensure the quality of steel, deoxidation must be carried out in the final stage of steelmaking. The chemical affinity between silicon and oxygen is very large, so ferrosilicon is an indispensable deoxidizer in the steelmaking industry. In steelmaking production, except for some boiling steels, almost all steel types use ferrosilicon as a strong deoxidizer for precipitation deoxidation and diffusion deoxidation. Adding a certain amount of silicon to steel can significantly improve the strength, hardness and elasticity of the steel. Therefore, it is widely used in smelting structural steel (containing siO. 40% ~ 1.75%) and tool steel (containing siO. 30%). ~ 1.8%), spring steel (containing Si O. 40% ~ 2.8%) and other steel types, a certain amount of ferrosilicon must be added as an alloying agent. Silicon also has the characteristics of large specific resistance, poor thermal conductivity and strong magnetic conductivity. Steel contains a certain amount of silicon, which can improve the magnetic permeability of the steel, reduce hysteresis loss, and reduce eddy current loss. Therefore, ferrosilicon is also used as an alloying agent when smelting silicon steel, such as low silicon steel for motors (containing Si O. 80% to 2.80%) and silicon steel for transformers (containing Si 2.81% to 4.8%). use.
In addition, in the steelmaking industry, ferrosilicon powder can release a large amount of heat when burned at high temperatures and is often used as a heating agent for steel ingot caps to improve the quality and recovery rate of steel ingots.
(2) Used as inoculant and spheroidizing agent in the cast iron industry. Cast iron is an important metal material in modern industry. It is cheaper than steel, easy to melt and smelt, has excellent casting properties and much better earthquake resistance than steel. Especially ductile iron, its mechanical properties reach or are close to those of steel. performance. Adding a certain amount of ferrosilicon to cast iron can prevent the formation of carbides in the iron and 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 reducing agent in ferroalloy production. Not only is the chemical affinity between silicon and oxygen very high, but the carbon content of high-silicon ferrosilicon is very low. Therefore, high-silicon ferrosilicon (or silicon alloy) is a commonly used reducing agent in the ferroalloy industry when producing low-carbon ferroalloys.
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