Rapid recovery of polycrystalline silicon from kerf loss slurry using double-layer organic solvent sedimentation method
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第10期
论文作者：Peng-fei Xing Jing Guo Yan-xin Zhuang Feng Li Gan-feng Tu
文章页码：947 - 952
摘 要：The rapid development of photovoltaic（PV）industries has led to a shortage of silicon feedstock.However,more than 40%silicon goes into slurry wastes due to the kerf loss in the wafer slicing process.To efectively recycle polycrystalline silicon from the kerf loss slurry,an innovative double-layer organic solvent sedimentation process was presented in the paper.The sedimentation velocities of Si and SiC particles in some organic solvents were investigated.Considering the polarity,viscosity,and density of solvents,the chloroepoxy propane and carbon tetrachloride were selected to separate Si and SiC particles.It is found that Si and SiC particles in the slurry waste can be successfully separated by the double-layer organic solvent sedimentation method,which can greatly reduce the sedimentation time and improve the purity of obtained Si-rich and SiC-rich powders.The obtained Si-rich powders consist of 95.04%Si,and the cast Si ingot has 99.06% Si.
Peng-fei Xing1，Jing Guo1,2，Yan-xin Zhuang1,3，Feng Li1，Gan-feng Tu1
1. School of Materials and Metallurgy,Northeastern University2. Xinjiang Joinworld Co., Ltd.,Xinjiang Uygur Autonomous Region3. Key Laboratory of Electromagnetic Processing of Materials,Northeastern University
摘 要：The rapid development of photovoltaic（PV）industries has led to a shortage of silicon feedstock.However,more than 40%silicon goes into slurry wastes due to the kerf loss in the wafer slicing process.To efectively recycle polycrystalline silicon from the kerf loss slurry,an innovative double-layer organic solvent sedimentation process was presented in the paper.The sedimentation velocities of Si and SiC particles in some organic solvents were investigated.Considering the polarity,viscosity,and density of solvents,the chloroepoxy propane and carbon tetrachloride were selected to separate Si and SiC particles.It is found that Si and SiC particles in the slurry waste can be successfully separated by the double-layer organic solvent sedimentation method,which can greatly reduce the sedimentation time and improve the purity of obtained Si-rich and SiC-rich powders.The obtained Si-rich powders consist of 95.04%Si,and the cast Si ingot has 99.06% Si.
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