Metallurgical and Materials Transactions B

, Volume 48, Issue 5, pp 2768–2780 | Cite as

The Effect of Secondary Refining on the Removal of Phosphorus from Metallurgical-Grade Silicon by Acid Leaching

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Abstract

The effects of structural composition, particle size, leaching time, temperature, and liquid–solid ratio on the removal of phosphorus from metallurgical-grade silicon (MG-Si) by acid leaching were investigated. Two specimens with different phase constitutions were studied: crude metallurgical-grade silicon (C-MG-Si), which is reduced from electric arc furnace, with a high content of Al and Ca, and a secondary refined metallurgical-grade silicon (S-MG-Si) obtained after secondary refining in ladle. Using scanning electron microscopy-energy dispersive spectroscopy, the phosphorus-containing phase was only detected in the C-MG-Si grain boundaries. The Si2Al2Ca phase, which was soluble in HCl, showed an affinity for phosphorus, with up to 0.53 wt pct dissolved in this phase. The optimum conditions for acid leaching were grain size, 75-106 μm; leaching time, 6 hours; leaching temperature, 338 K (65 °C); liquid–solid ratio, 6:1; and HCl concentration, 4.0 mol L−1. Using these conditions, the mass fractions of P in C-MG-Si and S-MG-Si were reduced from 105 × 10−6 and 76 × 10−6 to 48 × 10−6 and 61 × 10−6, respectively, with removal efficiencies of 54.3 and 19.7 pct, respectively. Besides, the investigation suggested that adding HF was beneficial for the removal of most impurities. After 6 hours of leaching MG-Si with a mixture composed of 4.0 mol L−1 HCl and 3.0 mol L−1 HF, the purity of C-MG-Si and S-MG-Si were increased from 97.55 and 99.31 pct to 99.91 and 99.87 pct, respectively, with extraction efficiencies of 96.14 and 81.59 pct, respectively. The etching results reveal that the HCl-HF mixture was an effective lixiviant for dissolving impurity inclusions in both C-MG-Si and S-MG-Si.

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Notes

Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 51461027, 51334002) and Open fund of State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization(No. CNMRCUTS1406)

References

  1. 1.
    L. A. V. Teixeira, K. Morita: ISIJ Int., 2009, vol. 49, pp.783–87.CrossRefGoogle Scholar
  2. 2.
    J. Li, L. Zhang, Y. Tan, D. Jiang, D. Wang, and Y. Li: Vacuum, 2014, vol. 103, pp. 33–37.CrossRefGoogle Scholar
  3. 3.
    M. Xiaodong, Z. Jian, and T. Wang: Rare Met., 2009, vol. 28, pp. 221–25.CrossRefGoogle Scholar
  4. 4.
    S. S. Zheng, T. A. Engh, M.Tangstad, and X. T. Luo: Sep. Purif. Technol., 2011, vol. 82, pp. 128–37.CrossRefGoogle Scholar
  5. 5.
    M.A. Martorano, J.B.F. Neto, T. S. Oliveira, and T. OTsubaki: Mater. Sci. Eng. B, 2011, vol. 176B, pp. 217–26.Google Scholar
  6. 6.
    N. P. Tucker: Iron. Steel Inst., 1927, vol.15, pp. 412–14.Google Scholar
  7. 7.
    J. Dietl: Sol. Cells, 1983, vol. 10, pp. 145–54.CrossRefGoogle Scholar
  8. 8.
    I. C. Santos, A. P. Gonçalves, C. S. Santos, M. Almeida, M. H. Afonso, and M. J. Cruz: Hydrometallurgy, 1990, vol. 23, pp. 237–46.CrossRefGoogle Scholar
  9. 9.
    C. E. Norman, E. M. Absi, R. E. Thomas: Can. J. Phys., 2011, vol. 63, pp. 859–62.CrossRefGoogle Scholar
  10. 10.
    S. K. Sahu, E. Asselin: Hydrometallurgy, 2012, vol. 121, pp. 120–25.CrossRefGoogle Scholar
  11. 11.
    R. Zeng, Y. H. Wang, J. X. Zhang, J. Q. Xu, H. Y. Li, and X. F. Chen: Adv. Mater. Res., 2012, vol. 549, pp. 428–31.CrossRefGoogle Scholar
  12. 12.
    H. Zhang, Z. Wang, W. Ma, K. Xie, and L. Hu: Ind. Eng. Chem. Res., 2013, vol. 52, pp. 7289–96.CrossRefGoogle Scholar
  13. 13.
    D. J. Min, N. Sano: Metall. Mater. Trans. B, 1988, vol. 19, pp. 433–39.CrossRefGoogle Scholar
  14. 14.
    T. Shimpo, T. Yoshikawa, K. Morita: Metall. Mater. Trans. B, 2004, vol. 35, pp. 277–84.CrossRefGoogle Scholar
  15. 15.
    M. D. Johnston, M. Barati: Sep. Purif. Technol., 2013, vol. 107, pp. 129–34.CrossRefGoogle Scholar
  16. 16.
    Y. V. Meteleva-Fischer, Y. Yang, R. Boom, B. Kraaijveld, and H. Kuntzel: Intermetallics, 2012, vol. 25, pp. 9–17.CrossRefGoogle Scholar
  17. 17.
    L. Jing-Wei, Z. C. Guo, H. Q. Tang, Z. Wang, and S. T. Sun: Trans. Nonferrous Met. Soc. China, 2012, vol. 22, pp. 958–63.CrossRefGoogle Scholar
  18. 18.
    B. C. Mohanty, and R. K. Galgali: Sol. Energy Mater., 1987, vol. 16,pp. 289–96.CrossRefGoogle Scholar
  19. 19.
    L. Hu, Z. Wang, X. Gong, Z. Guo, and H. Zhang: Sep. Purif. Technol., 2013, vol. 118, pp. 699–703.CrossRefGoogle Scholar
  20. 20.
    L.Hu, Z. Wang, X. Gong, Z. Guo, and H. Zhang: Metall. Mater. Trans. B, 2013, vol. 44, pp. 828–36.CrossRefGoogle Scholar
  21. 21.
    Y. Li, B. Ban, J. Li, T. Zhang, X. Bai, and J. Chen: Metall. Mater. Trans. B, 2015, vol. 46, pp. 542–44.CrossRefGoogle Scholar
  22. 22.
    L. Huang, H. Lai, C. Lu, M. Fang, W. Ma, and P. Xing: Hydrometallurgy, 2016, vol. 161, pp. 14–21.CrossRefGoogle Scholar
  23. 23.
    J. Li, B. Ban, Y. Li, X. Bai, T. Zhang, and J. Chen: Silicon, 2017, vol. 9, pp. 77–83.CrossRefGoogle Scholar
  24. 24.
    H. Okamoto: J. Phase Equilib. Diffus., 2007, vol. 28, p. 404.CrossRefGoogle Scholar
  25. 25.
    F. Margarido, M.O. Figueiredo, A.M. Queiróz, and J.P. Martins: Ind. Eng. Chem. Res., 1997, vol. 36, pp. 5291–95.CrossRefGoogle Scholar
  26. 26.
    J. C. Anglezio, C. Servant, F. Dubrous: J. Mater. Res., 1990, vol. 5, pp. 1894–99.CrossRefGoogle Scholar
  27. 27.
    F. Margarido, M. H. Bastos, M. O. Figueiredo, and J. P. Martins: Mater. Chem. Phys., 1994, vol. 38, pp. 342–47.CrossRefGoogle Scholar
  28. 28.
    F. Margarido, J. P. Martins, M. O. Figueiredo, and M. H. Bastos: Hydrometallurgy, 1993, vol. 34, pp. 1–11.CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society and ASM International 2017

Authors and Affiliations

  1. 1.Faculty of Metallurgy and Energy EngineeringKunming University of Science and TechnologyKunmingPeople’s Republic of China
  2. 2.State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan ProvinceKunming University of Science and TechnologyKunmingPeople’s Republic of China
  3. 3.National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunmingPeople’s Republic of China

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