Kucharik, Marian and Chamelot, Pierre
and Cassayre, Laurent
and Taxil, Pierre
Silver as Anode in Cryolite—Alumina-Based Melts.
(2007)
Chemical Papers, 61 (2). 142-145. ISSN 1336-9075
|
(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 224kB |
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 |
HAL Id: | hal-03594299 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Other partners > Slovak Academy of Sciences - SAS (SLOVAKIA) French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) |
Laboratory name: | Laboratoire de Génie Chimique - LGC (Toulouse, France) - Procédés électrochimiques (PE) Institute of Inorganic chemistry (Bratislava, Slovakia) |
Statistics: | download |
Deposited On: | 22 Oct 2008 09:14 |
Repository Staff Only: item control page