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Simulator of non-homogenous alumina and current distribution in an aluminum electrolysis cell to predict low-voltage anode effects

Dion Lukas, Kiss László, Poncsák Sándor et Lagacé Charles-Luc. (2018). Simulator of non-homogenous alumina and current distribution in an aluminum electrolysis cell to predict low-voltage anode effects. Metallurgical and Materials Transactions B, 49, p. 737-755.

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URL officielle: http://dx.doi.org/doi:10.1007/s11663-018-1174-2

Résumé

Perfluorocarbons are important contributors to aluminum production greenhouse gas inventories. Tetrafluoromethane and hexafluoroethane are produced in the electrolysis process when a harmful event called anode effect occurs in the cell. This incident is strongly related to the lack of alumina and the current distribution in the cell and can be classified into two categories: high-voltage and low-voltage anode effects. The latter is hard to detect during the normal electrolysis process and, therefore, new tools are necessary to predict this event and minimize its occurrence. This paper discusses a new approach to model the alumina distribution behavior in an electrolysis cell by dividing the electrolytic bath into non-homogenous concentration zones using discrete elements. The different mechanisms related to the alumina distribution are discussed in detail. Moreover, with a detailed electrical model, it is possible to calculate the current distribution among the different anodic assemblies. With this information, the model can evaluate if low-voltage emissions are likely to be present under the simulated conditions. Using the simulator will help the understanding of the role of the alumina distribution which, in turn, will improve the cell energy consumption and stability while reducing the occurrence of high- and low-voltage anode effects.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:49
Pages:p. 737-755
Version évaluée par les pairs:Oui
Date:29 Janvier 2018
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:Anode effect, anode assembly, aluminum distribution, individual anode currents, anode cover material, effet d'anode, assemblage d'anode, distribution d'aluminium, courants d'anode individuels, matériau de couverture d'anode
Déposé le:27 janv. 2021 23:08
Dernière modification:27 janv. 2021 23:08
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