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A ledge of certain thickness will be formed on the side wall of the cell during aluminum electrolysis process, its formation has a very important role for the normal production of aluminum electrolysis. First a three-dimensional unsteady heat transfer model with phase transformation is established by the finite difference method. Then the initial temperature field and the profile of initial ledge is calculated layer by layer and the nodes of ledge is corrected through iterative loop .Finally, the profile of the ledge will be simulated .It is found that the result calculated is good agreement with the test in cell . Keywords-aluminum electrolytic cell; ledge profile; finite difference method; node modification

Online Monitoring of Three Dimensional Ledge Profile of Aluminum Electrolytic Cell