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2019 | OriginalPaper | Buchkapitel

Evolution of Mechanical Resistance of Alumina Raft Exposed to the Bath in Hall-Héroult Cells

verfasst von : Sándor Poncsák, L. Rakotondramanana, László I. Kiss, T. Roger, S. Guérard, J.-F. Bilodeau

Erschienen in: Light Metals 2019

Verlag: Springer International Publishing

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Abstract

With the general tendency of increasing current and decreasing ACD in the aluminium electrolysis cells, the challenge of assuring of good control of alumina feeding is more and more important. Unfortunately, a significant part of the cold injected alumina forms floating rafts instead of dissolving fast. The temporary solidified bath around the rafts delays the alumina dissolution and promotes agglomeration, increasing the possibility of sludge formation. As both the solidifying bath around and in between the particles and the sintering of alumina increase mechanical strength, the kinetics of those phenomena can be followed by measuring the mechanical resistance of rafts removed from an electrolytic cell after different time periods. The goal of this paper was to examine the correlation between raft exposition time to the hot bath and the resulting mechanical resistance. For this reason, alumina rafts were produced under well controlled conditions in laboratory in order to carry out mechanical flexion tests on them. Results showed a gradually increasing mechanical resistance with exposition time.

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Metadaten
Titel
Evolution of Mechanical Resistance of Alumina Raft Exposed to the Bath in Hall-Héroult Cells
verfasst von
Sándor Poncsák
L. Rakotondramanana
László I. Kiss
T. Roger
S. Guérard
J.-F. Bilodeau
Copyright-Jahr
2019
DOI
https://doi.org/10.1007/978-3-030-05864-7_82

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