Purification of Metallurgical Grade Silicon by Slag and Acid Leaching Treatment

Abstract:

There are many methods of refining of metallurgical grade silicon (MG-Si). In this paper, the purification of MG-Si by slag and acid leaching treatment respectively is investigated. It is found that the main metallic impurities in MG-Si, such as Fe、Al、Ca、Ni、Ti，and nonmetallic elements, such as P、B, precipitated in Si-Ca phase, which is dissolved by acid easily. The influence of different ratio of slag/silicon upon removal rate of boron also be researched As well as, the effect of the cooling speed of the molten silicon on removal of P by acid treatment is researched and it indicated that the slower of cooling speed, the best effect removal of P is up to,There are many methods of refining of metallurgical grade silicon (MG-Si). In this paper, the purification of MG-Si by slag and acid leaching treatment respectively is investigated. It is found that the main metallic impurities in MG-Si, such as Fe、Al、Ca、Ni、Ti，and nonmetallic elements, such as P、B, precipitated in Si-Ca phase, which is dissolved by acid easily. The influence of different ratio of slag/silicon upon removal rate of boron also be researched As well as, the effect of the cooling speed of the molten silicon on removal of P by acid treatment is researched and it indicated that the slower of cooling speed, the best effect removal of P is up to

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 1590-1594
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.1590
• Online since: December 2011
• Authors: Fa Lin He, Xian Pei Ren, Hao Ran Cheng, Chao Chen
• Keywords: Acid Leaching Treatment, Metallurgical Grade Silicon (MG-Si), Slag

References

[1] E. Despotou, A. E. Gammal, et al., Global market outlook for photovoltaic until 2014, EPIA, (2010)

[2] Infromation on http://www.epia.org

[3] E. Enk, J. Nickl G.R.G. Patent 1,098,931(1961)

[4] Wacker-Chemie G.m.b.H.,Patent 922,879(1963)

[5] J. Strauss, U.S. Patent 2,866,701(1958)

[6] A.F.B. Braga, S.P. Moreira, P.R. Zampieri et al. Solar energy materials and solar cells. vol. 92 (2008), pp.418-428

[7] K. Morita and T. Miki, Intermetallics, vol. 11 (2003): pp.1111-1117

[8] J. Dietl, Solar Cells, 1983(10): 145-154.

[9] C. E. Norman, R. E. Thomas, and E. M. Absi, Can. J. Phys., 1983(63): 859-862.

[10] J. M. Juneja and T. K. Mukherjee, Hydrometallurgy, 1986(16): 69-75.

[11] Leandro Augusto Viana Teixeira, K. Morita, ISIJ vol.49 (2009), pp.783-787

[12] T. Shimpo, T. Yoshikawa, K. Morita. Metallurgical and materials transactions B. vol.35 (2004),pp.277-284