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Possibility of Complete Collecting Eutectic Si and Primary Si as Purified Si During Al-Si Solvent Refining with Zr Additions

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Abstract

The possibility of complete collecting eutectic Si and primary Si as purified Si during Al-Si solvent refining with Zr additions has been studied. From the ICP results, the B content in the eutectic Si is significantly higher than that in the primary Si with the low Zr addition (Zr addition ≤ 330 ppmw, Bmax=233 ppmw). With the excessive Zr addition, the B element in the melt is more and more distributed in the ZrB2 phase (over 95% with 3000 ppmw Zr addition), which causes the B content of primary Si and eutectic Si remained low level. Through the consistency of the estimated XZrB2 in this work with the theoretical value, the mechanism of the high-efficiency B removal is clearly revealed. The EDS analysis shows that the ZrSi2 phase is trapped and mixed in the collected Si crystal, which caused the Zr content in the Si crystal increasing abnormally, and the subsequent HCl + HF leaching process can effectively eliminate the trapped and mixed ZrSi2 phase in the Si phase. After leaching treatment, the B and Zr contents of eutectic Si and primary Si can reach the same level. This suggests that all Si crystals in Al-Si alloy can be used as purified Si, which greatly increases the recovery ratio of Si.

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Data Availability

The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (No.51804294, No.51874272, and No.52111540265); Anhui Provincial Natural Science Foundation (No. 1808085ME121); Key Laboratory of Photovoltaic and Energy Conservation Materials, Chinese Academy of Science (PECL2021QN003); Hefei Institutes of Physical Science, Chinese Academy of Sciences Director’s Fund (YZJJZX202018); International Clean Energy Talent Program by China Scholarship Council.

Funding

This work was financially supported by National Natural Science Foundation of China (No.51804294, No.51874272, and No.52111540265); Anhui Provincial Natural Science Foundation (No. 1808085ME121); Key Laboratory of Photovoltaic and Energy Conservation Materials, Chinese Academy of Science (PECL2021QN003); Hefei Institutes of Physical Science, Chinese Academy of Sciences Director’s Fund (YZJJZX202018); International Clean Energy Talent Program by China Scholarship Council.

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Authors and Affiliations

  1. Key Lab of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China

    Chen Chen, Jian Chen & Boyuan Ban

  2. University of Science and Technology of China, Hefei, 230026, China

    Chen Chen

  3. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China

    Jingwei Li

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  1. Chen Chen
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  4. Boyuan Ban
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Contributions

Chen Chen: substantial contributions to the conception, design of the work, the acquisition, analysis, drafted the work or substantively revised it.

Boyuan Ban: substantial contributions to the conception, design of the work, the acquisition, analysis, drafted the work or substantively revised it.

Jingwei Li: design of the work, the acquisition, analysis.

Jian Chen: the acquisition, analysis, substantial contributions to the conception.

Corresponding author

Correspondence to Boyuan Ban.

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Chen, C., Li, J., Chen, J. et al. Possibility of Complete Collecting Eutectic Si and Primary Si as Purified Si During Al-Si Solvent Refining with Zr Additions. Silicon 14, 11097–11108 (2022). https://doi.org/10.1007/s12633-022-01851-z

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