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Erschienen in:
2016 | OriginalPaper | Buchkapitel
On the Influence of Mhd Driven Convection on Cathode Wear
verfasst von : Kristian Etienne Einarsrud, Egil Skybakmoen, Asbjørn Solheim
Erschienen in: Light Metals 2014
Verlag: Springer International Publishing
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Non-uniform cathode wear observed in industrial aluminium reduction cells limits the cell life and thus presents a great challenge for the industry. The mechanism for cathode wear is not fully understood, although current densities, bath and metal convection and dissolution of aluminium carbide appear to play an important role. This work describes the two phase magnetohydrodynamic (MHD) flow in a simplified representation of an electrolysis cell, with emphasis upon the flow conditions at the cathode surface, which in turn drive mass transfer which is used to determine the cathode wear. Different cases are considered, focusing on current density distribution and electrode topology, simulating different operational conditions. The overall shape and magnitude of the wear rate obtained in the current simulations correspond well with measured wear rates, indicating that the MHD flow close to the cathode can shed new light upon cathode wear.