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A Method for the Directional Regulation of FeSi2 in High-Iron Metallurgical-Grade Silicon

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Abstract

Decreasing the FeSi2 content is key to improving the (CH3)2SiCl2 yield when using high-iron metallurgical-grade silicon (MG-Si) as the raw material to synthesize silicone monomers. However, the FeSi2 content in MG-Si is already quite low, making it difficult to further reduce. Here, by adjusting the melt composition and using the transformation mechanism of Fe-containing intermetallics during solidification, the negative FeSi2 was transformed into positive Si8Al6Fe4Ca and harmless Si2Al3Fe, which avoided the adverse effects of FeSi2. The results showed that typical intermetallics in the high-iron MG-Si melt were FeSi2, Si2Al2Ca, and Si8Al6Fe4Ca. When the melt was cooled to 860 °C, the key reaction was 4Al + FeSi2 + 4Si2Al2Ca → Si8Al6Fe4Ca + 2Si, The remaining FeSi2 was transformed into Si2Al3Fe under the action of Al. After directional regulation, FeSi2 was almost completely removed from high-Fe MG-Si, and the average content of Si8Al6Fe4Ca increased from 0.12 to 0.50 wt pct, an increase of 4.17 times. This phase was treated by the directional regulation of FeSi2, which lays a theoretical foundation and provided technical support for the use of high-iron MG-Si as a raw material to synthesize silicone monomers.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. U1902219), the Yunnan Young and Middle-aged Academic and Technical Leader Reserve Talent Project (No. 2018HB009), the Yunnan Distinguished Young Scholar Science Foundation (No. 202101AV070007), the Major Science and Technology Projects in Yunnan Province (No. 202002AB080002), the Sichuan Science and Technology Program (2021YJ0548), and the Research Project of Panzhihua University (2020ZD002).

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Authors and Affiliations

  1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, P.R. China

    Lei Zhou, Kuixian Wei, Xiaocong Deng, Jiahe Tian & Wenhui Ma

  2. College of Vanadium and Titanium, Panzhihua University, Panzhihua, 617000, P.R. China

    Kuisong Zhu

  3. Silicon Industry and Engineering Research Center of Yunnan Province, Kunming University of Science and Technology, Kunming, 650093, P.R. China

    Wenhui Ma

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  1. Lei Zhou
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Zhou, L., Wei, K., Zhu, K. et al. A Method for the Directional Regulation of FeSi2 in High-Iron Metallurgical-Grade Silicon. Metall Mater Trans B 54, 3426–3437 (2023). https://doi.org/10.1007/s11663-023-02920-3

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