Research on Removal of Boron from Metallurgical Grade Silicon by Si-Al Alloying

Abstract:

A low-cost process for removing boron from metallurgical grade silicon was developed by Si-Al alloying, and the separation procedure of silicon grains from Si-Al melt by solidification was investigated in this paper. The microstructure and purity of silicon were characterized and detected by metallographic analysis, energy dispersive X-ray spectrometers analysis and inductive coupled plasma atomic emission spectroscopy analysis. The results showed that the content of boron in the purified silicon decreased from 128.00 ppmw to 27.62 ppmw. In addition, the process of purification with Si-Al alloying combined with the treatment of hydrofluoric acid could remove boron to a low content of 13.81 ppmw, the removal rate of which is 89.21 %. The results indicated that the removal of boron from metallurgical grade silicon by Si-Al alloying is an efficient and prospective method.

• Periodical: Advanced Materials Research (Volumes 156-157)
• Pages: 1037-1040
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.156-157.1037
• Online since: October 2010
• Authors: Yu Liu, Dong Liang Lu, Yu Yan Hu, Tao Lin, Yan Hui Sun, Hong Yu Chen, Qian Shu Li
• Keywords: Metallurgical Grade Si, Removing Boron, Separation Procedure, Si-Al Alloying

References

[1] B.N. Mukashev, Kh.A. Abdullin, M.F. Tamendarov T.S. Turmagambetov : Solar Energy Mater. & Solar Cells , 93(2009) 1785-1791.

DOI: 10.1016/j.solmat.2009.06.011

[2] Wu Ji-jun, Ma Wen-hui, Yang Bin, Dai Yong-nian : Trans. Nonferrous Met. Soc China, 19(2009)463-467.

[3] Takeshi Yoshikawa, Kazuki Morita: Journal of Crystal Growth, 311(2009)776-779.

[4] Takeshi Yoshikawa, Kazuki Morita: ISIJ International, 45(2005)967-971.

[5] Tmiki, Kmorita, N Sano: Metall. Mater. Trans. B, 1996, 27B: 937~941.

[6] Chandra P. Khattak, David B. Joyce, Frederick Schmid: Solar Energy Mater. & Solar Cells74 (2002) 77-89.

[7] Takeshi Yoshikawa, Kazuki Morira: Metall. Mater. Trans. B, 2005, 36B: 731~736.