대한전자공학회:학술대회논문집 (Proceedings of the IEEK Conference)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

Separation of Silicon and Silica by Liquid-Liquid Extraction

  • Fujita, Toyohisa (Department of Materials-processing Engineering & Applied Chemistry for Environments Faculty of Engineering and Resource Science, AKITA UNIVERSITY) ;
  • Oo, Kyaw-Zin (Department of Materials-processing Engineering & Applied Chemistry for Environments Faculty of Engineering and Resource Science, AKITA UNIVERSITY) ;
  • Shibayama, Atsushi (Department of Materials-processing Engineering & Applied Chemistry for Environments Faculty of Engineering and Resource Science, AKITA UNIVERSITY) ;
  • Miyazaki, Toshio (Department of Materials-processing Engineering & Applied Chemistry for Environments Faculty of Engineering and Resource Science, AKITA UNIVERSITY) ;
  • Kuzuno, Eiichi (Department of Materials-processing Engineering & Applied Chemistry for Environments Faculty of Engineering and Resource Science, AKITA UNIVERSITY) ;
  • Yen, Wan-Tai (Department of Mining Engineering, Queen′s University)
  • 발행 : 2001.10.01
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초록

The objective of this investigation was to separate silicon and silica for recycling by the liquid-liquid separation technique. In the preparation of silicon (Si) single crystal, a small amount of silicon is fixed on the surface of silica (quartz, $SiO_2$) crucible. The used crucible is crushed for recycling both silicon and silica in a high purity from the mixed powder. Zeta-potential of silicon and silica are almost the same at pH higher than 3. Their separation by simple flotation is ruled out. However, their hydrophobic characteristics are different in several different organic solvent from the measurement of contact angle. Therefore, the liquid-liquid extraction is employed to separate silicon and silica. The result indicates that the organic solvent mixed with dodecyl ammonium acetate could extracted the silicon powder at high purity (97-100%) with high recovery from the silica powder in the water phase.

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