Korean
Production Process of FeSi 75%
- 1.
Raw Material Mixing: Quartz (SiO₂, source of Si) and iron ore/steel scrap (source of Fe) are blended in a ratio calculated to achieve ~75% Si. Coke or coal is added as a reductant to separate Si from SiO₂. - 2.
High-Temperature Smelting: The mixture is heated to 1800–2000°C in an EAF. At this temperature, SiO₂ reacts with C: SiO₂ + 2C → Si + 2CO↑, reducing Si to its elemental form, which combines with Fe. - 3.
Refining & Casting: Molten alloy is refined to remove slag (impurities) and cast into blocks, granules, or powders based on end-use requirements.
Why Composition Matters
- •
Deoxidization Efficiency: Si has a high affinity for oxygen (O), forming SiO₂ (slag) that floats off molten metal. At 75%, the alloy provides sufficient Si to fully deoxidize steel without excess, which would increase slag volume and energy use. - •
Alloying Precision: For steel, Si content dictates mechanical properties. Electrical steels require 2–4% Si (added via FeSi 75%), but using FeSi 75% allows precise dosing—adding 1kg of FeSi 75% contributes ~0.75kg of Si, enabling accurate target levels. - •
Cost-Benefit Balance: Higher Si alloys (e.g., FeSi 90%) are pricier and more brittle. FeSi 75% offers a sweet spot: effective performance at lower cost, with better handling during batch charging in furnaces.
Composition vs. Performance Metrics
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