2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 7: Ionic Liquids & Energy Production
| Editors: | Kongoli F, Gaune-Escard M, Mauntz M, Rubinstein J, Dodds H.L. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 310 pages |
| ISBN: | 978-1-987820-30-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Molten Salt Chemistry within the Carbon Cathode during Aluminum Electrolysis
Harald Arnljot Oye1; 0;1NTNU, Trondheim, Norway;
Type of Paper: Plenary
Id Paper: 260
Topic: 13
Abstract:
The carbon cathode used for aluminium electrolysis may appear very dense and impenetrable. However, after 4 years of service, it contains 35 wt % salts. This, in spite of that the porosity at the start is about 20 %. The reactions start with penetration of metallic sodium followed by molten Na3AlF6 and NaF. The penetration and reactions are studied by laboratory experiments as well as by core samples of used industrial cathodes. Products that form and partly disappear are NaCN, AlN, NaAlO2, Na2O.11Al2O3, AlC4 and Na5Al3F14. The behavior is explained by a thermodynamic model.
References:
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