Regulation and stabilisation of the alf3 content in an...

Details Regulation and stabilisation of the alf3 content in an... Regulation and stabilisation of the alf3 content in an...

C - Chemistry, Metallurgy

25

C

C25C 3/20 (2006.01) C25C 3/14 (2006.01) C25C 7/06 (2006.01)

Patent

CA 2041440

ABSTRACT A method is used for regulating and stabilising an AlF3 content (c), which is at least about 10% by weight, in the bath of an electrolysis cell for the production of aluminium from alumina dissolved in a cryolite melt. The individual state of an aluminium electrolysis cell, in particular of the cathodic carbon sump thereof, is analysed for a period (t1) 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 AlF3 and its effect in the electrolyte is determined. The additions (z) of AlF3 are calculated for a preset defined AlF3 content (c) allowing for the time delay (ZV), and AlF3 is added in portions or continuously.

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