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Application of ferro silicon in practical production

Release Time: 2023-12-06
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Ferro silicon alloy is also known as ferro silicon, ferro silicon is silicon and iron formed Fe2Si, Fe5Si3, FeSi, FeSi2 and other silicides, they are the main components of ferrosilicon, mainly used as a deoxidizer or alloying element additives, silicon content in the range of 8.0% – 95.0% of iron and silicon alloy. Ferro silicon according to the silicon content of 45%, 65%, 75% and 90% varieties, ferro silicon according to its Si and impurities are divided into 21 grades.

 

Ferro silicon is a kind of ferro alloy widely used. It is a ferro silicon alloy composed of silicon and iron in a certain proportion, and is an indispensable material for steelmaking. Ferro silicon is a deoxidizing agent for steelmaking and an alloying agent for smelting silicon steel. When smelting spring steel and heat-resistant steel, a certain amount of ferro silicon should also be added as alloying agent. Production practice has proved that oxygen in steel will significantly deteriorate the properties of steel and reduce the mechanical properties of steel. Therefore, the process of steelmaking must be deoxidized.

 

The Advantage of ferro silicon

Ferro silicon is an iron-silicon alloy made of coke, steel chips, quartz (or silica) as raw materials and smelted by electric furnace. Since silicon and oxygen are easy to combine into silicon dioxide, iron silicon is often used as a deoxidizer in steelmaking, and due to the release of a large amount of heat when SiO2 is generated, it is also beneficial to improve the temperature of molten steel at the same time.

At the same time, ferro silicon can also be used as alloying element additive, widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, ferro silicon in ferro alloy production and chemical industry, commonly used as a reducing agent.

 

Ferro silicon classification

There are many different sizes of ferro silicon, including ferro silicon 75, ferro silicon 72 and so on. Ferro silicon is widely used in iron and steel smelting, which can improve the mechanical properties of steel, such as hardness and strength, and improve the processing performance of steel. At the same time, ferro silicon also has good application value in the production process of aluminum alloy.

High Silicon Ferro

High ferro silicon refers to ferro silicon alloys with higher silicon content, usually more than 70% silicon content. High silicon iron is often used in special alloys, electronic materials and other fields, with good corrosion resistance and conductive properties. At the same time, high ferro silicon is also commonly used in the process of steel smelting, which can improve the mechanical properties of steel such as hardness and strength, and reduce the content of harmful elements such as sulfur and phosphorus.

In addition to ferro silicon and high ferrosilicon, there are other ferroalloy products with different silicon content, such as micro-ferrosilicon, medium ferro silicon and so on. The use and application range of each ferro silicon product is different, and it needs to be selected according to the actual production needs.

In short, ferro silicon is a very common ferro alloy product, including many different specifications and silicon content, with a wide range of applications. And high silicon iron is suitable for higher requirements of special alloys, electronic materials and other fields.

 

Ferro silicon Grade

Trademark

chemical composition

Si AI Ca Mn Cr P S C
scope
FeSi90AI.5 87.0-95.0 1.5 0.5 0.4 0.2 0.04 0.02 0.2
FeSi90AI3 87.0-95.0 3 0.5 0.4 0.2 0.04 0.02 0.2
FeSi75AI10.5-A 74.0-80.0 0.5 1 0.4 0.3 0.035 0.02 0.1
FeSi75AI10.5-B 72.0-80.0 0.5 1 0.5 0.5 0.04 0.02 0.2
FeSi75AI1.0-A 74.0-80.0 1 1 0.4 0.3 0.035 0.02 0.1
FeSi75AI1.0-B 72.0-80.0 1.5 1 0.5 0.5 0.04 0.02 0.2
FeSi75AI1.5-A 74.0-80.0 1.5 1 0.4 0.3 0.035 0.02 0.1
FeSi75 AI1.5-B 72.0-80.0 1.5 1 0.5 0.5 0.04 0.02 0.2
FeSi75 AI12.0-A 74.0-80.0 2 1 0.4 0.3 0.035 0.02 0.1
FeSi75 AI12.0-B 74.0-80.0 2 1 0.4 0.3 0.04 0.02 0.1
FeSi75 AI12.0-C 72.0-80.0 2 0.5 0.5 0.04 0.02 0.2

 

The use of ferro silicon

Used as deoxidizer and alloying agent in steelmaking industry. In order to obtain the chemical composition of qualified steel and ensure the quality of steel, in the final stage of steelmaking must be deoxidized, the chemical affinity between silicon and oxygen is very large, so ferro silicon is a strong deoxidizer for precipitation and diffusion in steelmaking.

Adding a certain amount of silicon to steel can significantly improve the strength, hardness and elasticity of steel, so when smelting structural steel (containing silicon 0.40-1.75%), tool steel (including SiO.30-1.8%), spring steel (including SiO.40-2.8%) and transformer silicon steel (containing silicon 2.81-4.8%), Ferro silicon is also used as an alloying agent.

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 cost and save iron. It is especially suitable for continuous casting steel deoxidation requirements. Practice has proved that ferro silicon not only meets the deoxidation requirements of steelmaking, but also has desulfurization performance and has the advantages of heavy ratio and strong penetration.

 

Ferro silicon products can be used with iron and steel smelting, casting, other ferro alloys, chemical and other industries, different countries of the use of ferro silicon composition difference is relatively large, more than 90% of the use of ferro silicon are used in the process of iron and steel casting, especially in the smelting process of crude steel. In countries with more developed steel technology, such as the United States and Japan, the proportion of steel and casting in the use of ferro silicon has declined, but it still remains at about 80%, and the use of ferro silicon in other industries such as chemical industry is also increasing.

 

Ferro silicon is often used in steelmaking as a deoxidizer, and due to the release of a lot of heat when SIO2 is generated, it is also beneficial to improve the temperature of molten steel at the same time. Ferro silicon as alloying element additive. It is widely used in low-alloy structural steel, bonding steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel. Outside ferro silicon is commonly used as a reducing agent in ferro alloy production and chemical industry. The silicon content is 95%-99%. Pure silicon is commonly used to make monocrystalline silicon or to prepare nonferrous metal alloys.

Ferro silicon production process

First, raw material selection

In the production of ferro silicon, both silicon and iron are the main raw materials. Silicon can be quartz sand, wollastonite, silicon ore and other forms, iron is iron ore, scrap steel and so on. In addition, some fuels and auxiliaries, such as coke, pulverized coal and carburizers, need to be used.

Second, furnace type selection

The production of ferro silicon can use a variety of furnace types, such as blast furnace, electric furnace, iron furnace and so on. Its selection needs to consider the raw material composition, production process and off-furnace conditions and other factors.

Third, smelting process

The smelting process of ferro silicon is mainly divided into two kinds, one is the ferro silicon furnace method, and the other is the ferro silicon furnace method.

Ferro silicon furnace method is the use of blast furnace or coke oven process to smelt ferro silicon, mainly used for the production of large ferro alloys, the production cost is low, but the process is complicated and the environment is seriously polluted.

Ferro silicon furnace rule is the use of electric heating reaction for smelting, can be flexible production deployment according to needs, do not need to pollute the environment, but the production cost is high.

 

 

Ferro silicon transportation

After the production of ferro silicon is completed, it needs to be processed, loaded and transported. Ferro silicon is generally transported by rail, and some are also transported by pickup trucks.

In general, the production process of ferro silicon has been continuously improved and innovative for a long time, and has played an important role in the metallurgical industry. It is hoped that the introduction of this article can help readers better understand the basic process flow of ferro silicon production.

Qinghai Yuyuan Metallurgy Co., Ltd. focuses on the production and export trade of ferro silicon alloy, and many large iron and steel manufacturers have many years of cooperative relations, production and sales of alloy products have been praised by customers.

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