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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.45  No.10 (2004)  >  pp.2994-2998

MATERIALS TRANSACTIONS
<<Previous article Vol.45  No.10 (2004)   pp.2994 - 2998 Next article>>

Solubility of Metal Oxides under Control of Basicity by Electrolysis in Fused Na2SO4

Michihisa Fukumoto1), Takahiro Suzuki1), Masanori Sano1), Masayuki Hirade1) and Motoi Hara1)
1) Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University

The dissolution behavior of NiO, Co3O4, Fe2O3, Fe3O4, SiO2, Al2O3 and Cr2O3 powders under the control of the O2− activity of fused Na2SO4 by electrochemical polarization was investigated. As a result, the increase in the quantity of electricity for the anodic reaction with increasing polarization potential for the platinum electrode caused an increase in the basicity(−log aNa2O) of the fused Na2SO4, while the increase in the quantity of electricity for cathodic reaction with decreasing polarization potential caused a decrease in basicity of the fused Na2SO4. The solubility of NiO and Co3O4 in fused Na2SO4 increased in the anodic potential region. However, their solubility did not increase in the cathodic potential region. The solubility of Fe2O3 and Fe3O4 slightly increased in the anodic potential region. The solubility of SiO2 did not increase in the anodic potential region, whereas the solubility of SiO2 increased with a decrease in the polarization potential in the cathodic potential region. The solubility of Al2O3 and Cr2O3 increased in the cathodic and anodic potential regions. The solubility of Al2O3 was larger than that of Cr2O3. We found that the resistance of acid and basic dissolution for oxides could be estimated by the electrochemical polarization method.


Keyword:
basicity, fused sodium sulfate, electrolysis, polarization, solubility, metal oxides

Received: May 26, 2004
Accepted: August 18, 2004 , Published online: June 24, 2005
Copyright (c) 2005 The Japan Institute of Metals

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