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High temperature solar electrothermal processing—III. Zinc from zinc oxide at 1200–1675K using a non-consumable anode

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  • Palumbo, R.D.
  • Fletcher, E.A.

Abstract

The electrolytic decomposition potential of ZnO has been studied in a solar furnace in the temperature range 1200–1675 K. The electrolyte consisted of various mixtures of CaF2 and Na3AlF6. The measured potentials were close to the thermodynamically predicted values for the reaction ZnO(s) → Zn(g) + 0.502(g). The zero current overvoltages, surprisingly, increased with increasing temperature and the concurrent change in composition. The specific conductances of the electrolytes were estimated in the temperature range 1200–1500 K. They increased with increasing temperature and the concurrent change in composition. Various materials were tested for use as electrodes and crucibles. Some of our experiences and our experimental techniques are described.

Suggested Citation

  • Palumbo, R.D. & Fletcher, E.A., 1988. "High temperature solar electrothermal processing—III. Zinc from zinc oxide at 1200–1675K using a non-consumable anode," Energy, Elsevier, vol. 13(4), pages 319-332.
    • Handle: RePEc:eee:energy:v:13:y:1988:i:4:p:319-332
    DOI: 10.1016/0360-5442(88)90027-8
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    Cited by:

    1. Korenko, M. & Larson, C. & Blood, K. & Palumbo, R. & Nudehi, S. & Diver, R. & Blood, D. & Šimko, F. & Venstrom, L.J., 2017. "Technical and economic evaluation of a solar thermal MgO electrolysis process for magnesium production," Energy, Elsevier, vol. 135(C), pages 182-194.
    2. Chaubey, Rashmi & Sahu, Satanand & James, Olusola O. & Maity, Sudip, 2013. "A review on development of industrial processes and emerging techniques for production of hydrogen from renewable and sustainable sources," Renewable and Sustainable Energy Reviews, Elsevier, vol. 23(C), pages 443-462.
    3. Sheline, W. & Matthews, L. & Lindeke, N. & Duncan, S. & Palumbo, R., 2013. "An exploratory study of the solar thermal electrolytic production of Mg from MgO," Energy, Elsevier, vol. 51(C), pages 163-170.

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