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The Solubility of Some Transition Metal Oxides in Cryolite-Alumina Melts: Part III. Solubility of CuO and Cu2O

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Abstract

The solubilities of CuO (at 1 atm oxygen pressure) and of Cu2O (in equilibrium with Cu) were measured in cryolite-alumina melts at 1020 °C as functions of the alumina content of the melt, and of the NaF/AlF3 ratio in melts saturated with alumina. The results enable separation of the contributions of Cu(I) and Cu(II) species in solution, and are interpreted in terms of the solute species CuF, CuAlO2, and Na2CuF4. In alumina-saturated melts with NaF/AlF3 = 3 the solubility of CuO is given by log (wt% Cu) = −9664/T + 7.0128, where T is temperature in kelvins, and of Cu2O by log (wt% Cu) = −8677/T + 6.173.

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Authors and Affiliations

  1. Hydro Research Centre, Porsgrunn, Hydro Aluminium Metal, P.O. Box 2560, Porsgrunn, N-3908, Norway

    Odd-Arne Lorentsen ( Regional Manager, Technology and Operational Support)

  2. Electrolysis Support, Hydro Aluminium Metal, P.O. Box 114, NO-6991, Høyanger, Norway

    Trond E. Jentoftsen (Manager, Electrolysis Support)

  3. 648, Pimlico Pl., Kingston, ON, K7M 5T8, Canada

    Ernest W. Dewing (Retired)

  4. Department of Materials Science and Engineering, NTNU, NO-7491, Trondheim, Norway

    Jomar Thonstad (Emeritus Professor)

Authors
  1. Odd-Arne Lorentsen
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  2. Trond E. Jentoftsen
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  3. Ernest W. Dewing
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  4. Jomar Thonstad
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Corresponding author

Correspondence to Ernest W. Dewing.

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Manuscript submitted September 24, 2006.

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Lorentsen, OA., Jentoftsen, T.E., Dewing, E.W. et al. The Solubility of Some Transition Metal Oxides in Cryolite-Alumina Melts: Part III. Solubility of CuO and Cu2O. Metall Mater Trans B 38, 833–839 (2007). https://doi.org/10.1007/s11663-007-9043-4

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  • DOI: https://doi.org/10.1007/s11663-007-9043-4

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