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http://dx.doi.org/10.7844/kirr.2012.21.5.31

Recovery of Silicon from Silicon Sludge by Electrolysis  

Park, Jesik (School of Advanced Materials & System Eng., Kumoh National Institute of Technology)
Jang, Hee Dong (Nano-Materials Group, Korea Institute of Geoscience & Mineral Resources)
Lee, Churl Kyoung (School of Advanced Materials & System Eng., Kumoh National Institute of Technology)
Publication Information
Resources Recycling / v.21, no.5, 2012 , pp. 31-37 More about this Journal
Abstract
As a recovery of elemental silicon from the sludge of Si wafer process, a process of mechanical separation-chlorine roasting-electrolysis has been suggested. The silicon sludge consisted of Si, SiC, machine oil, and metallic impurities. The oil and metal impurities was removed by mechanical separation. The Si-SiC mixture was converted to silicon chloride by chlorine roasting at $1000^{\circ}C$ for 1 hr and the silicon chloride was dissolved into an ionic liquid of $[Bmpy]Tf_2N$ as an electrolyte. Cyclic voltammetry results showed an wide voltage window of pure $[Bmpy]Tf_2N$ and a reduction peak of elemental Si from $[Bmpy]Tf_2N$ dissolved $SiCl_4$ on Au electrode, respectively. The silicon deposits could be prepared on the Au electrode by the potentiostatic electrolysis of -1.9 V vs. Pt-QRE. The elemental silicon uniformly electrodeposited was confirmed by various analytical techniques including XRD, FE-SEM with EDS, and XPS. Any impurity was not detected except trace oxygen contaminated during handling for analysis.
Keywords
Silicon sludge; Elemental silicon; Recovery; Electrolysis; Non-aqueous electrolyte;
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