Ferrosilicon is a ferroalloy, an alloy of iron and silicon with an average silicon content between 15 and 90 weight percent. It contains a high proportion of iron silicides. Ferrosilicon is used for manufacture of silicon, corrosion-resistant and high-temperature resistant ferrous silicon alloys, and silicon steel for electromotors and transformer cores. In the manufacture of cast iron, ferrosilicon is used for inoculation of the iron to accelerate graphitization. In arc welding, ferrosilicon can be found in some electrode coatings. Ferrosilicon is used as a source of silicon to reduce metals from their oxides and to deoxidize steel and other ferrous alloys. This prevents the loss of carbon from the molten steel (so called blocking the heat). Ferro Silicon is used in the production of cast iron, as Ferro Silicon can accelerate graphitization. Ferro Silicon replaces the need for ferro manganese, spiegeleisen and calcium silicides in the manufacturing process.
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Ferrosilicon is produced by reduction of silica or sand with coke in the presence of iron. Typical sources of iron are scrap iron, mill scale. Ferrosilicon’s with silicon content up to about 15% are made in blast furnaces lined with acid fire bricks. Ferrosilicon’s with higher silicon content are made in electric arc furnaces. The usual formulations on the market are ferrosilicon’s with 15%, 45%, 75%, and 90% silicon. The remainder is iron, with about 2% consisting of other elements like aluminum and calcium. An overabundance of silica is used to prevent formation of silicon carbide. Micro silica is a useful byproduct.
A mineral perlite is similar to ferrosilicon, with its composition Fe5Si2. In contact with water, ferrosilicon may slowly produce hydrogen. The reaction, which is accelerated in the presence of base, is used for hydrogen production. The melting point and density of ferrosilicon depends on its silicon content, with two nearly-eutectic areas, one near Fe2Si and second spanning FeSi2-FeSi3 composition range.
Best FeSi from Khomeyn and Azna
|No.||Date||Delivery Term||Tax (9%)||Grade||Size||Price( USD )||Chart|
|1||11-Mar to 17-Mar||FOB Russia||Not Include||65%||10-60||1225|
|2||11-Mar to 17-Mar||FOB China||Not Include||75%||10-60||1210|
|3||11-Mar to 17-Mar||FOB Bhutan||Not Include||70-75%||10-60||1230|
|FeSilicon||75% min||2% Max||1% Max||0.4% Max||0.3% Max||0.035% Max||0.02% Max||0.01% Max||10-60|