Ferrosilicon is an iron alloy composed of iron and silicon.

Ferrosilicon is an iron-silicon alloy made from coke, steel scraps, and quartz as raw materials and smelted in an electric furnace.

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High silicon content 40-70%

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Manufacture And Use

(1) Used as a deoxidizer and alloy agent in the steelmaking industry. To obtain steel with a qualified chemical composition and ensure the quality of steel, deoxidation must be carried out during the steelmaking stage. The chemical affinity between silicon and oxygen is very large, so ferrosilicon is a strong deoxidizer in steelmaking and is used 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. Ferrosilicon is also used as an alloying agent when containing SiO. 40-2.8%) and silicon steel for transformers (containing 2.81-4.8% silicon). At the same time, improving the shape of inclusions and reducing the content of gas elements in molten steel is an effective new technology to improve steel quality, reduce costs, and save iron. Especially suitable for the deoxidation requirements of continuous casting molten steel. Practice has proved that ferrosilicon not only meets the deoxidation requirements of steelmaking, but also has desulfurization performance, and has the advantages of large specific gravity and strong penetration.

In addition, in the steelmaking industry, ferrosilicon powder can release a large amount of heat during high-temperature sintering 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 an 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 has much better impact resistance than steel. In particular, ductile iron has mechanical properties that are equal to or close to those of steel. 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 ductile iron, ferrosilicon is an important inoculant (helping to precipitate graphite) and spheroidizing agent.

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

(4) Ferrosilicon is often used in the high-temperature smelting process of magnesium metal in the Pidgeon process of magnesium smelting. To replace magnesium in CaO·MgO, approximately 1.2 tons of ferrosilicon are consumed for every ton of magnesium metal produced. Magnesium metal plays an important role.

(5) Other uses. Ground or atomized ferrosilicon 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 is used in the chemical industry to make products such as silicones.

Among these uses, the steelmaking industry, foundry industry, and ferroalloy industry are large users of ferrosilicon. Together they consume about 90% of the ferrosilicon. Among various grades of ferrosilicon, 75% ferrosilicon is currently widely used. In the steelmaking industry, approximately 3-5kg of 75% ferrosilicon is consumed per 1 ton of steel.