Chemistry: electrical and wave energy – Processes and products
Patent
1989-01-11
1990-09-11
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
204245, C25C 306, C25C 314
Patent
active
049560549
ABSTRACT:
Method used in connection with the exchange of anodes in cells producing aluminum by electrolysis according to the Hall-Heroult process. Each cell comprises a cathode containing a fused salt bath or aluminum oxide dissolved in cryolite, and above the cathode is provided one or more carbon anodes which are partly submerged in the bath and are partly covered with and surrounded by a crust which forms on the bath. Immediately before a used anode is to be removed a cut is made in the crust all the way around the anode and as close to the anode as possible. A device for performing the method is in the form of a crust cutter comprising a share which is turnably mounted around a vertical axis on the outer end of a telescopic device. The telescopic device at its inner end is mounted for rotation about its longitudinal axis in a housing or frame construction which can be raised or lowered.
REFERENCES:
patent: 3306668 (1967-02-01), Ellingsaeter et al.
patent: 4019973 (1977-04-01), Natvik et al.
patent: 4778304 (1988-10-01), Baldi et al.
patent: 4832412 (1989-05-01), Bertrand
Dronnesund Kjartan
Stale Heggo
Norsk Hydro a.s.
Valentine Donald R.
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