The process to finish with an anode effect occurring during the production of aluminium in a cell eletrolitica

摘要

The invention relates to a method of quenching (or terminating) anode effects which arise during the production of aluminum by fused salt electrolysis in a cell containing a molten electrolyte including alumina and a plurality of carbon-containing anodes dipping into the electrolyte. The method involves dividing at least 25% of the total number of anodes into groups of adjacent anodes located at different positions longitudinally of the cell, moving at least one of the groups upwardly and the remainder downwardly to "pump" the cell, the upwardly moving groups alternating with the downwardly moving groups in the longitudinal direction of the cell, and adding alumina to the cell. The anodes are returned to their original operating positions and, if the anode effect has not been quenched, are again moved in the same or opposite pattern. High quenching efficiency can be achieved by the method of the invention with minimal variations in the surface level of the molten electrolyte.