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Clean Preparation of High-Purity Silicon from Rice Husk Ash by a Modified Metallurgical Method

  • Pyrometallurgical Processing of Secondary Resources
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Abstract

Rice husk ash (RHA) has been used to prepare high-purity silicon by a combination of a silicon preparation process and a refining process. Raw materials including RHA, silica sand and SiO2-CaO-Al2O3 slag were initially pelletized and then smelted in an electric arc furnace. The results show that slag refining and acid leaching have significant influences on purifying Si products. With the addition of slag, the purity of Si increased from 94.96% to 96.47% and the contents of impurities such as Fe and P reduced from 2.06 wt.% and 0.09 wt.% to 0.77 wt.% and 0.05 wt.%, respectively. After acid leaching, the purity of the Si increased to 99.76% and the content of P reduced to 0.029 wt.%. The leaching kinetics analysis results show that the surface chemical reaction model is suitable to describe the extraction process of Fe, Al, and Ca in silicon.

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Acknowledgments

This work was supported by the National Key Research and Development Program of China (Grant Nos. 2018YFC1901805 and 2018YFC1901804,) and the National Natural Science Foundation of China (Grant No. U1902219).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Jian Kong, Donghui Wei, Pengfei Xing & Kaikai Ye

  2. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Yanxin Zhuang & Xing Jin

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  1. Jian Kong
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  2. Donghui Wei
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  3. Pengfei Xing
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  4. Yanxin Zhuang
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Correspondence to Pengfei Xing or Yanxin Zhuang.

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Kong, J., Wei, D., Xing, P. et al. Clean Preparation of High-Purity Silicon from Rice Husk Ash by a Modified Metallurgical Method. JOM 73, 1919–1927 (2021). https://doi.org/10.1007/s11837-021-04674-2

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  • DOI: https://doi.org/10.1007/s11837-021-04674-2

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