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Anodic dissolution of metals in oxide-free cryolite melts

Cassayre, Laurent and Chamelot, Pierre and Arurault, Laurent and Taxil, Pierre Anodic dissolution of metals in oxide-free cryolite melts. (2005) Journal of applied electrochemistry , vol. 3 (n° 10). pp. 999-1004. ISSN 1572-8838

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Official URL: http://dx.doi.org/10.1007/s10800-005-6727-9

Abstract

The anodic behavior of metals in molten cryolite-alumina melts has been investigated mostly for use as inert anodes for the Hall-Héroult process. In the present work, gold, platinum, palladium, copper, tungsten, nickel, cobalt and iron metal electrodes were anodically polarized in an oxide-free cryolite melt (11%wt. excess AlF3 ; 5%wt. CaF2) at 1273 K. The aim of the experiments was to characterize the oxidation reactions of the metals occurring without the effect of oxygen-containing dissolved species. The anodic dissolution of each metal was demonstrated, and electrochemical reactions were assigned using reversible potential calculation. The relative stability of metals as well as the possibility of generating pure fluorine is discussed.

Item Type:Article
Additional Information:The original publication is available at http://www.springerlink.com/content/100178/
Audience (journal):International journal (no peer-reviewed)
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Rio Tinto Alcan (CANADA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Thomas Bonnecarere

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