Investigation de l'augmentation de la résistivité des barres collectrices utilisées dans les cuves d'électrolyse d'aluminium

Authors: Gauvin, Guillaume
Advisor: Fafard, MarioLarouche, Daniel
Abstract: Life span of aluminium smelting electrolysis cells can reach up to 3000 days. During this period, cathode blocks go under various physical and chemical changes that could result in an increase of electrical resistivity. The increase may be due to carbon migration from the cast iron to the steel bars, gap evolution between the cathode block and the cast iron, cathode cracking, etc. This thesis focuses, however, only the evolution of electrical resistivity of collector steel bars. To reveal the main phenomena responsible for the electrical resistivity increase, chemical analysis, metallographic and electrical resistivity tests were conducted on two steels bars picked up from two Hall-Héroult cells after their autopsies. Cathode voltage loss and temperature were measured using electrically insulated internal probes and thermocouples on 16 samples from each steel bar. Electrical resistivity can reach up to 1.21μΩ-m for a steel bar aged for 2505 days and it depends on temperature and carbon concentration.
Document Type: Mémoire de maîtrise
Issue Date: 2011
Open Access Date: 18 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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