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Title: The Role of Granule Size on the Kinetics of Electrochemical Reduction of SiO2 Granules in Molten CaCl2
Authors: Yang, Xiao
Yasuda, Kouji
Nohira, Toshiyuki  kyouindb  KAKEN_id
Hagiwara, Rika
Homma, Takayuki
Author's alias: 楊, 肖
安田, 幸司
萩原, 理加
野平, 俊之
Keywords: Granule Size
Granule Surface
High Reduction Rate
SiHCl3
SiO2 Core
Issue Date: Feb-2016
Publisher: Springer US
Journal title: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume: 47
Issue: 1
Start page: 788
End page: 797
Abstract: As a fundamental study to develop a new process for producing solar-grade silicon, the effect of granule size on the kinetics of the electrochemical reduction of SiO2 granules in molten CaCl2 was investigated. SiO2 granules with different size ranges were electrolyzed in molten CaCl2 at 1123 K (850 °C). The reduction kinetics was evaluated on the basis of the growth rate of the reduced Si layer and the behavior of the current during electrolysis. The results indicated that finer SiO2 granules are more favorable for a high reduction rate because the contact resistance between the bottom Si plate and the reduced Si particles is small and the diffusion of O2− ions in CaCl2 inside the porous Si shell is easy. Electrolysis using SiO2 granules less than 0.1 mm in size maintained a current density of no less than 0.4 A cm−2 within 20 minutes, indicating that the electrochemical reduction of fine SiO2 granules in molten CaCl2 has the potential of becoming a high-yield production process for solar-grade silicon.
Rights: This is a post-peer-review, pre-copyedit version of an article published in 'Metallurgical and Materials Transactions B'. The final authenticated version is available online at: https://doi.org/10.1007/s11663-015-0456-1
The full-text file will be made open to the public on 1 February 2017 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/230381
DOI(Published Version): 10.1007/s11663-015-0456-1
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