Ferro Silicon is an alloy of iron and silicon. Ferrosilicon is produced by reduction of silica or sand with coke in the presence of iron. 

Ferro Silicon with higher Silicon(Si) content are made in electric arc furnaces. The remainder is iron, with small portions consisting of other elements like aluminium and calcium..

The popular Ferro Silicon grades of around 60%-70%-75% Silicon are produced by carbothermic reduction in a submerged arc furnace. The source of iron is either iron ores or scrap and for silicon is quartz or quartzite.

The smelting reaction between silica and carbon is characterized by the formation of silicon carbide and SiO gas as intermediary products. Silicon carbide reacts with SiO2 at smelting temperature to form Silicon (Si) and SiO. The Silicon Oxide (SiO) gas transports to a lower temperature region in the furnace and reacts with carbon and silicon carbide. Unreacted SiO gas escapes to the top of the furnace charge and constitutes a loss of a silicon unit. In smelting of Ferro Silicon alloys (60%-70%-75% Si), Iron presence lowers the activity of silicon, and this reduces the generation of SiO gas, thereby leading to higher Silicon recovery. 

Ferro Silicon (FeSi) is used as a source of silicon to reduce metals from their oxides and to deoxidize steel and other ferrous alloys. This prevents loss of carbon (C) from the molten steel (so called blocking the heat. In the manufacture of cast iron, ferrosilicon is used for inoculation of the iron to accelerate graphitization. Ferrosilicon is also important as an additive to cast irons for controlling the initial content of silicon.

Reframat offers Ferro Silicon Lumps as well as Ferro Silicon Powders along with low Aluminium Ferro Silicon meeting the specific requirements as received from the clients

Normal Specifications* :

Silicon (Si)               :   70-75%

Aluminium (Al)   : 1.1% (max)

Carbon (C)         : 0.15% (max)

Phosphorus (P) : 0.05% (max)

Sulphur (S)        : 0.05% (max)

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