Chemistry: electrical and wave energy – Processes and products
Patent
1991-04-29
1992-03-10
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
2041531, 204245, C25C 306, C25C 320
Patent
active
050947281
ABSTRACT:
A method is used for regulating and stabilizing an AlF.sub.3 content (c), which is at least about 10% by weight, in the bath of an electrolysis cell for the production of aluminum from alumina dissolved in a cryolite melt.
The individual state of an aluminum electrolysis cell, in particular of the cathodic carbon sump thereof, is analyzed for a period (t.sub.1) from a series of measured values, comprising a plurality of parameters. By means of a model calculation, the optimum time delay (ZV) between the addition of AlF.sub.3 and its effect in the electrolyte is determined. The additions (z) of AlF.sub.3 are calculated for a preset defined AlF.sub.3 content (c) allowing for the time delay (ZV), and AlF.sub.3 is added in portions or continuously.
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Soviet Inventions Illustrated, Oct. 6, 1982, Zusammenfassung No. 71690 M28.
Alusuisse-Lonza Services Ltd.
Valentine Donald R.
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