|
Author(s): |
Dong-liang Lu, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institutes, Guangzhou 510006, P. R. China; Enginee
Yu-yan Hu, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institutes, Guangzhou 510006, P. R. China; Enginee
Tao Lin, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institutes, Guangzhou 510006, P. R. China; Enginee
Yan-hui Sun, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institutes, Guangzhou 510006, P. R. China; Enginee
Chang-juan Guo, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institutes, Guangzhou 510006, P. R. China; Enginee
Qian-shu Li, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institutes, Guangzhou 510006, P. R. China; Enginee
Hong-yu Chen, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China Base of Production, Education & Research on Energy Storage and Power Battery of Guangdong Higher Education Institutes, Guangzhou 510006, P. R. China; Enginee |
|
Abstract: |
A low-cost process for removing Fe, Al, Ca and B 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. With the process of purification by Si-Al alloying, the removal efficiency of Fe, Al, Ca and B from silicon achieved 99.87%, 65.10%, 97.85% and 67.51% respectively. In addition, the process of purification by Si-Al alloying combined with the treatment of hydrofluoric acid could remove Fe and Ca to a low content of 0.1 ppmw, with the removal rates of 99.998% and 99.986% respectively; Al and B to 81.04 and 13.81 ppmw, the removal efficiency of which were 97.84% and 86.05%. The results indicated that the removal of impurities from metallurgical grade silicon by Si-Al alloying was an efficient and prospective method.
|