M. Barati, S. Sarder
The feasibility of producing high purity silicon from amorphous silica fume using a low temperature magnesiothermic reduction was demonstrated. Initially, commercial silica fume containing 97.5% amorphous silica was purified through acid leaching and roasting to eliminate considerable amounts of transition metals and carbon. The subsequent reduction process utilized magnesium as the reductant. Various parameters including reductant quantity, initial temperature, and dwell time were assessed to determine their impact on the yield and nature of the reaction products. The optimal reduction conditions were identified to achieve maximum silicon metal yield, which occurred at a Mg/SiO2 molar ratio of 2.0, a preheating temperature of 750 °C, and a holding duration of 2 hours. Following the leaching and purification of the reduction products, high purity silicon (>99 wt%) was successfully obtained, containing <3 ppmw B and 12 ppmw P, indicating that this material surpasses metallurgical grade silicon, thus being suitable for solar-grade silicon feedstock.
@article{634f0261-2af6-490d-a62d-66b61f535ded,
title={Recovery of silicon from silica fume},
author={M. Barati and S. Sarder},
year={2026},
language={en}
}TY - JOUR TI - Recovery of silicon from silica fume AU - M. Barati AU - S. Sarder PY - 2026 LA - en ER -
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