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Study of Mutual Separation of Siliconand Quartz Using Liquid-LiquidExtraction

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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, SiO2) crucible. The used crucible is crushed for recycling both silicon and silica in 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 liquidliquid extraction is employed to separate silicon and silica. The result indicates that the organic solvent mixed with dodecylamine 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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