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Silver as Anode in Cryolite—Alumina-Based Melts

Kucharik, M and Chamelot, Pierre and Cassayre, Laurent and Taxil, Pierre Silver as Anode in Cryolite—Alumina-Based Melts. (2007) Chemical Papers, vol. 61 (n° 2). pp. 142-145. ISSN 1336-9075

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Official URL: http://dx.doi.org/10.2478/s11696-007-0011-x

Abstract

The anodic behaviour of silver was investigated in cryolite—alumina-based melt. Silver has a lower melting point (ca. 960◦C) than the other metals considered as possible inert materials for aluminium electrolysis. The working temperature used in aluminium industry is approximately 960◦C, depending on the melt composition. Therefore, the stability of silver during the anodic process was tested at 870◦C in an acidic electrolyte consisting of 65.5 mass % Na3AlF6 + 22.9 mass % AlF3 + 5.7 mass % CaF2 + 3.9 mass % LiF + 2 mass % Al2O3 with the melting point ca. 850◦C. The electrolyte without alumina was prepared as well, with the melting point ca. 860◦C. The resulting cryolite ratio (CR = n(NaF)/n(AlF3)) for both electrolytes was equal to 1.6. The behaviour of the silver anode was studied by voltammetry measurements. The electrochemical study showed that an oxidation reaction occurred at a potential below the oxygen evolution potential. Silver was not found to be stable under oxygen evolution. The degradation of the silver anode was apparent after electrolysis.

Item Type:Article
Additional Information:Thanks to SpringerLink editor. The definitive version is available at http://www.springerlink.com The original PDF of the article can be found at Chemical Papers website : http://www.springerlink.com/content/120193
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Slovak Academy of Sciences - SAS (SLOVAKIA)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Hélène Dubernard

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