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Ferro Silicon Precipitation And Diffusion Deoxidation
- Jul 01, 2017 -

Ferro Silicon Precipitation and diffusion deoxidation

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(1) Used as a deoxidizer and a gold alloy in the steelmaking industry. In order to obtain chemical composition of qualified steel and to ensure the quality of steel, in the final stage of steelmaking must be deoxidized, silicon and oxygen between the chemical affinity is large, so ferrosilicon is a strong steel oxide for precipitation and diffusion deoxidation. In the steel to add a certain amount of silicon, can significantly improve the strength of steel, hardness and flexibility, and thus in the smelting structural steel (silicon 0.40-1.75%), tool steel (containing SiO.30-1.8%), spring steel Containing SiO00-2-8%) and silicon steel for transformers (2.81-4.8% silicon), ferrosilicon is also used as a gold alloy. At the same time to improve the shape of inclusions to reduce the content of gas in the molten steel, is to improve the quality of steel, reduce costs and save effective new technology with iron. Especially for continuous casting molten steel deoxidation requirements, proved that ferrosilicon not only meet the steel deoxidation requirements, but also has a desulfurization performance and has a greater than the advantages of strong penetration.

In addition, in the steelmaking industry, the use of ferrosilicon powder at high temperatures, can produce a lot of heat burning, this is often used as a steel ingot heating agent to improve the quality and recovery of ingots.

(2) Used as inoculants and nodulizers in the cast iron industry. Cast iron is an important metal in modern industry, it is cheaper than steel, easy to melt smelting, with excellent casting performance and much better than the steel seismic capacity. Especially ductile iron, its mechanical properties meet or close to the mechanical properties of steel. The addition of a certain amount of ferrosilicon in the cast iron can prevent the formation of carbides in the iron and promote the precipitation and spheroidization of graphite. Thus, in the production of ductile iron, ferrosilicon is an important inoculant (to help the precipitation of graphite) and nodular The

(3) ferrous alloy production as a reducing agent. Not only the chemical affinity between silicon and oxygen is very large, and the silicon content of high silicon ferrosilicon is very low. Therefore, high silicon ferrosilicon (or siliceous alloy) is a ferroalloy industry in the production of low carbon ferroalloy is more commonly used as a reducing agent.

(4) 75 # ferrosilicon in the Piejiang method of magnesium commonly used in the process of high temperature metal smelting, CaO.MgO in the magnesium replaced, the production of one ton of metal magnesium will consume about 1.2 tons of ferrosilicon, Magnesium metal production plays a significant role.

(5) the use of other aspects. The finely divided or atomized ferrosilicon powder can be used as a suspension phase in the beneficiation industry. In the electrode manufacturing industry can be used as electrode coating. High silicon ferrosilicon in the chemical industry can be used to manufacture silicone and other products.

In these applications, the steelmaking, foundry and ferroalloy industries are the largest users of ferrosilicon. They consume about 90% more ferrosilicon. Among the various grades of ferrosilicon, the most widely used is 75% ferrosilicon. In the steel industry, each production of 1t steel consumption of about 3-5kg75% ferrosilicon.


Chemical composition

Si Al Ca Mn Cr P S C

The range is not greater than

FeSi75AI1.0-b 72.0-80.0 1 1 0.5 0.5 0.04 0.02 0.2

FeSi75AI1.5-b 72.0-80.0 1.5 1 0.5 0.5 0.04 0.02 0.2.