Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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The Effect of the Purity of Raw Materials on the Purity of Silicon Extracted by Solvent Refining and Centrifugation

용매정제법과 원심분리법으로 추출한 Si의 순도에 미치는 장입 원재료 순도의 영향

  • Cho, Ju-Young (School of Energy, Materials and Chemical Engineering Korea University of Technology and Education) ;
  • Seo, Kum-Hee (School of Energy, Materials and Chemical Engineering Korea University of Technology and Education) ;
  • Kang, Bok-Hyun (School of Energy, Materials and Chemical Engineering Korea University of Technology and Education) ;
  • Kim, Ki-Young (School of Energy, Materials and Chemical Engineering Korea University of Technology and Education)
  • 조주영 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 서금희 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 강복현 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 김기영 (한국기술교육대학교 에너지.신소재.화학공학부)
  • Received : 2012.07.25
  • Published : 2012.12.25
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Abstract

High purity silicon can be obtained from Al-Si alloys by a combination of solvent refining and centrifugation. Silicon purification by crystallization of silicon from an Al-Si alloy melt was carried out using 2N and 4N purity aluminum and 2N purity silicon as raw materials. The effect of the purity of raw materials on the final silicon ingot purity by centrifugation was investigated for an Al-50 wt% Si alloy. Alloys were melted using an electrical resistance furnace, and then poured into a centrifuging apparatus. A silicon lump like foam was obtained after centrifugation and was leached by an acid in order to get pure silicon flakes. Then silicon flakes were melted to make a silicon ingot using an induction furnace. The purities of the silicon flakes and silicon ingot were enhanced significantly compared to those of the raw materials of silicon and aluminum. The silicon ingot made of 4N aluminum and 2N silicon showed the lowest impurities.

Keywords

Acknowledgement

Supported by : 한국연구재단

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