Title: Process and apparatus for controlling solid electrolyte additious to electrolytie cells for aluminium productiou
Application Number: 88102179 Application Date: 1988.04.20
Publication Number: 1022352 Publication Date: 1988.11.23
Approval Pub. Date: 1993.09.15 Granted Pub. Date: 1993.09.15
International Classifi-cation: C25C3/14;C25C3/20
Applicant(s) Name: Aluminium Pechiney Address:
Inventor(s) Name: Alain Paternoga;Benoit Sulmont
Attorney & Agent: YU GANG
Abstract:
    The invention relates to a process for controlling solid electrolyte additions to a cell for producing aluminum in a molten cryolitic bath. According to this process a nominal value HBC is fixed for the bath height, the level of the bath in the cell is periodically determined, from it is deduced the total height HT of the electrolytic bath layer HB and the liquid aluminum layer HM, the thickness HM of the liquid aluminum layer on the cathode substrate is determined, from it is deduced the bath layer height HB, HB=HT-HM and Hb is compared with the nominal value HBC. If this comparison reveals a bath deficiency, a ground bath addition is initiated. If this comparison reveals a bath excess, an alarm is triggered in order to bring about a bath tapping operation.
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