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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Modeling the Behavior of Alumina Agglomerate in the Hall-Héroult Process
verfasst von : Véronique Dassylva-Raymond, Laszlo I. Kiss, Sandor Poncsak, Patrice Chartrand, Jean-François Bilodeau, Sébastien Guérard
Erschienen in: Light Metals 2014
Verlag: Springer International Publishing
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During the feeding of the Hall-Héroult cell, cold alumina comes into contact with the electrolyte bath and tends to agglomerate due to the formation of a frozen bath layer that holds physically the alumina together. This agglomeration, producing alumina agglomerates, called also lumps or sludge, affects both the rate of alumina dissolution and the stability of the cell. In this paper, all the physical phenomena (heat and mass transfer) between the formation and the complete dissolution of agglomerate will be described and are defined by a set of equations. This mathematical model allows observing the strong coupling between the mechanisms of heat and mass transfer e.g. the solidification with diffusion of chemical species, the infiltration of the bath in the porous agglomerate and the dissolution of sintered alumina. A parametric study using this model might identify the most important factors related to the lifespan and behavior of alumina agglomerates.