Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Extraction of Pure Si from an Al-Si Alloy Melt during Solidification by Centrifugal Force

Al-Si 합금 융체로부터 순 실리콘의 원심분리 추출

  • Cho, Ju-Young (Department of Materials Engineering, Korea University of Technology and Education) ;
  • Kang, Bok-Hyun (Department of Materials Engineering, Korea University of Technology and Education) ;
  • Kim, Ki-Young (Department of Materials Engineering, Korea University of Technology and Education)
  • 조주영 (한국기술교육대학교 신소재공학과) ;
  • 강복현 (한국기술교육대학교 신소재공학과) ;
  • 김기영 (한국기술교육대학교 신소재공학과)
  • Received : 2011.04.07
  • Published : 2011.11.25
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Abstract

The present study describes a new technique to extract the primary silicon from an Al-Si alloy melt using centrifugal force during its solidification. The primary silicon was separated from an Al-50 wt.%Si alloy by centrifugal force in the form of a foam, which facilitated subsequent acid leaching to extract the pure silicon due to its wide surface area. The foam recovery after centrifugal separation was decreased as centrifugal acceleration was increased. The final recovery after acid leaching became closer to the solid fraction of the alloy, which was calculated from the Al-Si binary phase diagram, with increasing centrifugal acceleration due to the effective removal of the attached Al on the foam. The purity of the primary silicon obtained by the centrifugal separation method was over 99.99%, with only aluminum being also present.

Keywords

Acknowledgement

Supported by : 한국기술교육대학교

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