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PLENARY LECTURES AND VIP GUESTS
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Harald Arnljot Oye
NTNU
Molten Salt Chemistry Within The Carbon Cathode During Aluminum Electrolysis
3rd Intl. Symp. on Sustainable Molten Salt and Ionic Liquid Processing
Back to Plenary Lectures »
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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.
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