New Method of Low Carbon Ferro Silicon Production

What is Ferro Silicon?

Ferro silicon, also known as Ferrosilicon alloy, is composed of iron, silicon, and other small amounts of impurities such as aluminum, carbon, etc. Ferrosilicon is made from coke, steel scraps, and silica as raw materials and is smelted in an electric furnace.

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The Specification of Ferrosilicon

GradeSi minC maxAl max
ferro silicon chemical composition

The Uses of Ferrosilicon

Since silicon and oxygen easily combine to form silica, ferrosilicon is often used as a deoxidizer in steelmaking. At the same time, since SiO2 releases a large amount of heat when it is generated, it is also beneficial to increase the temperature of molten steel while deoxidizing.

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

The Production Process of Low Carbon Ferro Silicon

With the development of purity steel production, the steel industry requires high purity of ferro silicon. The impurities in ferro silicon such as Ti, P, C, Al, Ca, etc.) need to be controlled strictly.

In the current production of high-purity ferrosilicon (including low-carbon ferrosilicon), carbides in ferrosilicon mainly exist in the form of SiC, and it is inevitable that some carbides enter the alloy during the smelting process, which will cause silicon There is too much carbon content in iron, which affects the quality of ferrosilicon and the selling price of ferrosilicon.

Therefore, it is very necessary to solve the defect of high carbon content in existing ferrosilicon.

The article shares a low-carbon ferrosilicon smelting method to solve the problem of high carbon content in existing ferrosilicon.

In order to achieve the above object, the technical solution adopted by the present invention is: a low-carbon ferrosilicon smelting method, which is specifically implemented according to the following steps:

Select quartz stone, reducing agent and silicon steel sheets as the concentrate raw materials, add them to the molten iron ladle, and heat and melt them

When the molten iron in the molten iron ladle accounts for one-third of its volume, weigh the slag-forming agent and add it to the molten iron ladle. The mass ratio of the slag-forming agent to the concentrate raw material is (1-3): 100;

Blow oxygen and compressed air from the bottom of the ladle

Remove slag from the surface of molten iron

Use a sampling rod to sample the molten iron until the color is bright and the processing is completed.

Advantages of This Method of Producing Ferrosilicon:

Quartz stone is the first-grade material, and the reducing agent is stone tar.

The slagging agent is produced by grinding a mixture of silica powder, quicklime powder and fluorite.

According to the mass percentage, silica powder accounts for 40%-50%, quicklime powder accounts for 35%-40%, and the fluorite ratio is 10%-25%.

A breathable brick is provided at the bottom of the ladle, and a copper pipe is provided inside the breathable brick. The oxygen and compressed air pass through the copper pipe.

Compared with the existing technology, this low-carbon ferrosilicon smelting method can reduce the carbon content in the ferrosilicon prepared by the existing process by more than 70%.

Using oxygen blowing for refining can ensure full contact between oxygen and molten iron, react with carbon as much as possible, and ensure that the carbon content in ferrosilicon is greatly reduced. SiC can be precipitated by using slagging agent, thereby reducing the carbon content in ferrosilicon.

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