Ferrosilicon is an alloy of iron and silicon, which is widely used in the industrial field. It is mainly composed of iron (Fe) and silicon (Si), and also contains a small amount of impurity elements such as manganese (Mn), chromium (Cr), carbon (C), phosphorus (P), sulfur (S), etc. Depending on the grade, the silicon content in ferrosilicon is generally between 15% and 90%, and the common ones are ferrosilicon65%, ferrosilicon70%, ferrosilicon75%, etc. For example, FeSi75-A means that the silicon content is not less than 72% and not more than 80%, and the rest is mainly iron and other impurity elements.

Ferrosilicon

chemical composition

Grade	Chemical Composition(mass fraction)%
	Si	Al	Ca	Mn	Cr	P	S	C
	≥	≤
FeSi90Al1.5	87.0~95.0	1.5	1.5	0.4	0.2	0.04	0.02	0.2
FeSi9oAl3.0	87.0~95.0	3	1.5	0.4	0.2	0.04	0.02	0.2
FeSi75Al0.5-A	74.0~80.0	0.5	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al0.5-B	72.0~80.0	0.5	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al1.0-A	74.0~80.0	1	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al1.0-B	72.0~80.0	1	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al1.5-A	74.0-80.0	1.5	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al1.5-B	72.0~80.0	1.5	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al2.0-A	74.0~80.0	2	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al2.0-B	72.0~80.0	2		0.5	0.5	0.04	0.02	0.2
FeSi75-A	74.0~80.0			0.4	0.3	0.035	0.02	0.1
FeSi75-B	72.0~80.0			0.5	0.5	0.04	0.02	0.2
FeSi65	65.0~72.0			0.6	0.5	0.04	0.02

Production process

Raw material preparation

The main raw materials are silica, coke and iron-containing raw materials. Silica requires high silicon dioxide content and low impurity content; coke, as a reducing agent, needs to have a high fixed carbon content and suitable particle size; iron-containing raw materials generally use steel scraps, iron ore, etc., to adjust the iron content in the product.

Smelting process

The pretreated raw materials are added to the submerged arc furnace in a certain proportion and smelted by the high temperature generated by the electrode. Under high temperature conditions, the silicon dioxide in the silica is reduced by coke to produce silicon and carbon monoxide. During the reaction, iron and silicon form ferrosilicon alloy. The smelting process requires strict control of parameters such as temperature, raw material ratio, furnace atmosphere, etc. to ensure the quality and output of the product.

Refining and casting

The ferrosilicon melt after smelting is refined to further remove impurities and adjust the composition. The refined ferrosilicon is then poured into a specific mold for casting, and after cooling and solidification, it forms ferrosilicon lumps or ferrosilicon particles.

Products Main uses

Steel industry

Deoxidizer:

Ferrosilicon is one of the most commonly used deoxidizers in the steelmaking process. Silicon has a strong affinity with oxygen and can combine with oxygen in molten steel to form oxides such as silicon dioxide, thereby removing oxygen from steel and improving the quality and performance of steel, such as strength, toughness, and corrosion resistance.

Alloying agent:

Ferrosilicon can be added to steel as an alloying element to improve the strength, hardness, wear resistance, and heat resistance of steel. For example, in the production of special steels such as spring steel, bearing steel, and heat-resistant steel, ferrosilicon is an important alloying additive.

Inoculant:

In cast iron production, ferrosilicon is used as an inoculant to improve the structure and properties of cast iron, improve the strength, toughness, and wear resistance of cast iron, and reduce defects and scrap rates of castings.

Other industries

Non-ferrous metal industry:

In the production of non-ferrous metals such as aluminum and magnesium, ferrosilicon can be used as an additive to improve the properties of alloys, such as improving the strength, hardness, and heat resistance of aluminum alloys.

Chemical industry:

Ferrosilicon can be used to produce chemical products such as silicide and silicon alloy, which are widely used in electronics, semiconductors, ceramics and other fields. For example, ferrosilicon reacts with chlorine to produce silicon tetrachloride, which is an important raw material for preparing polysilicon, which is a key material for the solar photovoltaic industry and the semiconductor industry.

Other applications:

Ferrosilicon can also be used to manufacture welding materials such as welding rods and fluxes, and as a reducing agent for the production of other metals and alloys.

High Quantity FerroSilicon

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