Sub-cathode shield comprising deformable areas for Hall-Héroult electrolytic pots

摘要

A subcathodic shield for use with Hall-Heroult electrolysis cells. The shield, which is located below the carbonaceous blocks which make up the cathode, and above the cell housing, comprises at least one continuous steel sheet at least 5 mm thick extending substantially over the total area between the base of the cathode and the base of the housing, and which has at least one deformable zone for absorbing thermal stresses caused by differences in temperatures between the shield section situated below the central area of the cathode and the shield section situated below the peripheral areas of the cathode.