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

R. D. Palumbo, E. A. Fletcher

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)319-332
Number of pages14
JournalEnergy
Volume13
Issue number4
DOIs
StatePublished - Apr 1988

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