Abstract
This paper presents an updated calculation of the theoretical minimum energy required to electrochemically reduce alumina to aluminum using either consumable carbon anodes or oxygen evolving (non-consumable or inert) anodes. Knowledge of this energy (the standard enthalpy of reaction) is required for heat balance calculations. The reversible potential, or Nernst potential, needed to calculate cell voltage, is obtained from the standard Gibbs energy of reaction and the activities of reactants and products. A more conservative definition of energy efficiency is proposed. Problems involving heat balance and energy consumption when using oxygen-evolving anodes are discussed.
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References
D. Bratland, K. Grjotheim and C. Krohn, Light Metals 1976, v. 1, p. 3.
W. Haupin, Light Metals 1998, p. 531.
K. Grjotheim and H. Kvande, Introduction to Aluminium Electrolysis, Aluminium-Verlag, Düsseldorf, pp. 18 – 22 1993.
K. Grjotheim, C. Krohn, M. Malinovsky, K. Matiasovsky, and J. Thonstad, Aluminium Electrolysis, 2nd Edition, Section 7.2.2, Primary anode product. Aluminium-Verlag, Dusseldorf Germany (1982) pp. 228 223.
Ibid., Section 7.2.6, Mechanism of anode process p 237.
J. Thonstad, Electrochim Acta 13, p. 449 (1968).
Ibid, 28,p. 113(1983).
E. W. Dewing and J. Thonstad, Met. and Mat. Trans., 28B (12), (1997) p.1089.
A. Solheim and Å. Sterten, Light Metals 1999, p445.
T. R. Beck, J. Electrochem. Soc, 106 (1959), p. 710.
JANAF Thermochemical Tables, Third Edition American Institute of Physics, New York, NY. (1985).
J. Caissy, G. Dufour and P. Lapointe, Light Metals 1998, p. 215.
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© 2016 The Minerals, Metals & Materials Society
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Haupin, W., Kvande, H. (2016). Thermodynamics of Electrochemical Reduction of Alumina. In: Bearne, G., Dupuis, M., Tarcy, G. (eds) Essential Readings in Light Metals. Springer, Cham. https://doi.org/10.1007/978-3-319-48156-2_22
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DOI: https://doi.org/10.1007/978-3-319-48156-2_22
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48155-5
Online ISBN: 978-3-319-48156-2
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