Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Involving measuring – analyzing – or testing during synthesis
Reexamination Certificate
2007-03-20
2007-03-20
Bell, Bruce F. (Department: 1746)
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Involving measuring, analyzing, or testing during synthesis
C205S337000, C205S372000, C205S374000, C205S392000, C205S394000, C205S396000
Reexamination Certificate
active
10467483
ABSTRACT:
The invention relates to a regulation method for an electrolytic cell for the production of aluminium by means of reduction of alumina dissolved in a molten cryolite bath, wherein a solidified bath ridge is formed on the internal walls of the pot, a quantity B, referred to as the “ridge variation indicator”, which is sensitive to the variation of said solidified bath ridge, is determined and at least one of the setting means of the pot (such as the anode-metal distance) and/or at least one control operation (such as the addition of AlF3) is modified as a function of the value obtained for said indicator. The indicator may be determined from electrical measurements on the pot and/or from measurements of the liquid metal surface area. The method according to the invention makes it possible to regulate an electrolytic cell effectively at currents of up to 500 kA with an electrolyte bath with an AlF3content greater than 11% and reduce the number of AlF3content measurements in the bath considerably.
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Ketil A. Rye: “Dynamic Ledge Response in Hall-Heroult Cells”, Light Metals, 1999, pp. 347-352.
Peter M. Entner: “Control of AIF3Concentration”, Light Metals, 1992, pp. 369-374.
M. J. Wilson: “Practical Considerations Used in the Development of a Method for Calsulating Aluminium Fluoride Additions Based on Cell Temperatures”, Light Metals, 1992, pp. 375-378.
Bonnardel Oliver
Vanvoren Claude
Aluminum Pechiney
Bell Bruce F.
Shaw McBee Susan E.
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