What are the raw materials for ferro silicon

Ferro silicon (FeSi) is an alloy of iron (Fe) and silicon (Si), primarily used as a deoxidizer and alloying agent in steelmaking. The main raw materials for producing ferro silicon are:

1. Silica (SiO₂) – Quartz or Quartzite

The primary source of silicon, with a required SiO₂ content of at least 95% (preferably >98%).

Impurities like Al₂O₃, CaO, and P should be minimized.

2. Iron Sources (Iron Ore, Steel Scrap, or Mill Scale)

Provides the iron (Fe) component in ferro silicon.

Common sources:

Iron ore (hematite/magnetite)

Steel scrap (low impurities)

Mill scale (iron oxide byproduct from steel rolling)

3. Carbonaceous Reductant (Coke, Coal, or Charcoal)

Acts as a reducing agent in the submerged arc furnace (SAF) to convert SiO₂ into silicon.

Preferred types:

Metallurgical coke (low ash, high fixed carbon)

Coal (low phosphorus & sulfur)

Charcoal (used in some cases for purity)

4. Fluxing Agents (Optional, e.g., Lime or Dolomite)

Sometimes added to adjust slag properties and remove impurities.

Production Process:

Ferro silicon is typically produced in a submerged arc furnace (SAF) by carbothermic reduction of silica in the presence of iron at 1,500–2,000°C.

The general reaction is:

SiO2+2C+Fe→FeSi+2COSiO2​+2C+Fe→FeSi+2CO

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