Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Involving measuring – analyzing – or testing during synthesis
Reexamination Certificate
2006-09-26
2006-09-26
King, Roy (Department: 1742)
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Involving measuring, analyzing, or testing during synthesis
C205S391000, C205S392000, C205S396000
Reexamination Certificate
active
07112269
ABSTRACT:
Operations in a cell for electrolytic production of aluminum are controlled by establishing a standard rate of addition of aluminum fluoride to a molten electrolyte covered by a crust; establishing a target temperature for a duct carrying offgas from a chamber containing the molten electrolyte; measuring an actual temperature in the duct; and, in response to the actual temperature measurement in the duct, performing at least one of (1) when the actual temperature is greater than the target temperature, inspecting the crust for a crust hole and then repairing any observed crust hole, and (2) varying an actual rate of addition of aluminum fluoride to the electrolyte by increasing the actual rate above the standard rate when the actual temperature is greater than the target temperature and by reducing the actual rate below the standard rate when the actual temperature is less than the target temperature. Controlling operations in accordance with the invention improves cell energy efficiency.
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Effect of Open Holes in the Crust on Gasueous Flouride Evolution From Pots (The Minerals, Metals, & Materials Society) Slaugenhaupt, Bruggeman, Tarcy and Dando (6 pages) San Diego Conf. Mar. 2-6, 2003.
Bruggeman Jay N.
Slaugenhaupt Michael L.
Alcoa Inc.
King Roy
Leader William T.
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