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Title: Electrolytic Reduction of Solid Al₂O₃ to Liquid Al in Molten CaCl₂
Authors: Kadowaki, Haruna
Katasho, Yumi
Yasuda, Kouji
Nohira, Toshiyuki  kyouindb  KAKEN_id
Author's alias: 門脇, 遥奈
片所, 優宇美
安田, 幸司
野平, 俊之
Keywords: alumina
electrochemical reduction
molten salt
Issue Date: 2018
Publisher: The Electrochemical Society
Volume: 165
Issue: 2
Start page: D83
End page: D89
Abstract: The electrochemical reduction of Al₂O₃ has been investigated in molten CaCl₂ at 1123 K. To predict the electrochemical reduction behavior depending on the activity of O²⁻ ions, the potential–pO²⁻ diagram for the Al–Ca–O–Cl system is constructed from thermochemical data. In a Mo box-type electrode, an Al₂O₃ tube is successfully reduced to liquid Al with a maximum purity of 98 at%. However, in the electrolysis of Al₂O₃ powder in an Fe box-type electrode, Al₂Ca is produced through the formation of Ca₁₂Al₁₄O₃₃ as an intermediate product. The different electrochemical reduction behaviors of the tube and the powder are explained by the different diffusion path lengths for O²⁻ ions from three-phase zone (Al₂O₃/CaCl₂/cathode metal) to bulk CaCl₂.
Rights: © The Author(s) 2018. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND,, which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email:
DOI(Published Version): 10.1149/2.1191802jes
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