An experimental setup was created to study the dynamic behavior of side ledge under conditions of electrolysis in a cryolite-alumina electrolyte. The installation has a built-in window on the side panel, which allows changing the lining material and thereby varying the heat flow. An experimental study of the dynamic formation of side ledge in dependence on temperature, electrolyte movement rate and heat flow during the electrolysis of aluminum was carried out. The rate of the ledge formation and its thickness are determined by the heat flow, which is caused by the temperatures of the electrolyte, the sides of the cell and the liquidus temperature. Just as in the industrial cell, the side ledge profile formed in the experimental cell can be divided into three zones: the ledge at the bottom in contact with liquid aluminum; ledge/electrolyte interface; ledge on the electrolyte level. If the temperature of the inner wall is higher than the liquidus temperature, then the side ledge does not form, but if it is less, then the formation of the side ledge occurs until these temperatures equalize. Thus, the stability of the side ledge depends on the heat flow from the center to the walls, however, the dynamic behavior (crystallization/melting) of the ledge/aluminum zone occurs slowly and differs from the side ledge.
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