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Removal of Phosphorus in Silicon by the Formation of CaAl2Si2 Phase at the Solidification Interface

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Abstract

To fully understand the role of CaAl2Si2 phase in concentrating the non-metallic impurity phosphorus, an experiment of directional solidification of Al-70 at. pct Si alloy with extreme small lowering rate 0.05 mm min−1 was carried out. With good dynamic condition for the diffusion of impurity (Ca, Al, P) from silicon to the S/L interface, the CaAl2Si2 phase with 0.6-0.7 at. pct P was successfully observed by Electron Probe Micro Analyzer (EPMA), and its distribution character was originally presented. This impurity phase was widely detected in the refined sample but only at the interface of silicon crystal and Al-Si alloy which contributed to the deep removal of impurity P. The formation mechanism of CaAl2Si2-P phase was thus explored, in which the microsegregation and concentration of element P, Ca, Al in front of S/L interface were crucial. After acid leaching, the P content decreased from the original 23 ppm to below 5 ppm. Compared with normal solidification, a 16 pct higher removal efficiency of P was obtained in this study.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51422405, 51404229 and 51174187).

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Authors and Affiliations

  1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), No. 1 Bei Er Jie, Zhong Guan Cun, Beijing, 100190, China

    Liyuan Sun (Postdoctoral Fellow), Zhi Wang (Professor), Hang Chen (Master Student, Researcher), Dong Wang (Research Assistant) & Guoyu Qian (Postdoctoral Fellow)

  2. Zijin Mining Group Co. Ltd, State Key laboratory of Comprehensive Utilization of Low-grade Refractory Gold Ores, Shanghang, Fujian, 364200, China

    Hang Chen (Master Student, Researcher)

Authors
  1. Liyuan Sun
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  2. Zhi Wang
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  3. Hang Chen
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  4. Dong Wang
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  5. Guoyu Qian
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Corresponding author

Correspondence to Zhi Wang.

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Manuscript submitted March 10, 2016.

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Sun, L., Wang, Z., Chen, H. et al. Removal of Phosphorus in Silicon by the Formation of CaAl2Si2 Phase at the Solidification Interface. Metall Mater Trans B 48, 420–428 (2017). https://doi.org/10.1007/s11663-016-0848-x

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