Process and apparatus for controlling solid electrolyte addition

Details Process and apparatus for controlling solid electrolyte addition Process and apparatus for controlling solid electrolyte addition

1988-04-18

1989-08-15

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

204245, 204225, C25C 306, C25C 320

Patent

active

048571571

ABSTRACT:
Process and apparatus for controlling solid electrolyte additions to electrolytic cells for aluminum production.
The invention relates to a process for controlling solid electrolyte additions to a cell for producing aluminum by the electrolysis of alumina dissolved in a molten cryolitic bath according to the Hall-Heroult process.
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 on the basis of a fixed dimension point PF known relative to the carbon-containing cathode substrate, 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 from a storage means through at least one opening made in the solidified electrolyte crust normally covering the cell. If this comparison reveals a bath excess, an alarm is triggered in order to bring about a bath tapping operation.

REFERENCES:
patent: 3616432 (1971-10-01), Day
patent: 3899402 (1975-08-01), Chaudhuri
patent: 3900371 (1975-08-01), Chaudhuri
patent: 4675081 (1987-06-01), Girard

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