Process for controlling anode effects during the production of aluminum
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United States of America Patent
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Mar 15, 2005
Grant Date -
Apr 29, 2004
app pub date -
Oct 23, 2002
filing date -
Oct 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method is described for adding alumina to a Soderberg or pre-bake type electrolytic cell fed by schedule crust breaking. Instead of adding the full amount of alumina required following each crust breaking, as is traditional, the standard dose of alumina is now split into two smaller doses. Thus, a major proportion, e.g. about 50 to 90% by weight, of the theoretically required alumina to sustain the electrolysis between crust breakings is added following a crust breaking. The electrical resistance of the electrolyte is monitored between crust breakings, and if the resistance begins to rapidly increase indicating the approach of an anode effect, the anodes are activated into a pumping action thereby breaking the crust adjacent the anodes, allowing alumina to flow into the molten electrolyte, and also creating a stirring action within the molten electrolyte. This lowers the resistance such that any anode effect is avoided until the next full crust breaking.
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