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- In relation to this article, we declare that there is no conflict of interest.
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Received July 20, 2024
Accepted February 3, 2025
Available online April 25, 2025
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Study on the Dissociation of Cryolite in SPL
https://doi.org/10.1007/s11814-025-00412-5
Abstract
The spent pot lining of aluminum electrolysis (SPL) is a typical harmful solid waste discharged from the production process
of primary aluminum. It contains about 30% of fl uoride and 0.2% of cyanide, which is a valuable fl uorine-containing resource.
With SPL as raw material, sodium carbonate was used as a reagent, and dissociation of cryolite was investigated by a baking
process. Gibbs free energy of cryolite dissociation was calculated and the reaction mechanism of cryolite was discussed. At
the same time, the eff ects of reagent addition ratio, baking temperature and reaction time on the dissociation of cryolite in
SPL were discussed. The results show that under the conditions of a reagent addition ratio of 30–35wt%, baking temperature
of 800–850
