C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/144, 204/203
C25C 3/14 (2006.01) B25D 17/32 (2006.01) C25C 7/06 (2006.01)
Patent
CA 1337058
Method used in connection with the exchange of anodes in cells producing aluminium by electrolysis according to the Hall-Heroult process. Each cell comprises a cathode contain- ing a fused salt bath of aluminium oxide dissolved in cryo- lite, and above the cathode is provided one or more carbon anodes (22) which are partly submerged in the bath and are partly covered with and surrounded by a crust. Immediately before a used anode is to be removed a through-going 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 (1) comprising a share (20) which is turnably mounted around a vertical axis on the outer end of a telescopic device (2) or the like, which telescopic device (2) at its inner end is rotatably mounted in each direction in a housing or frame construction (8) which can be raised or lowered.
587907
Dronnesund Kjartan
Heggo Stale
Fetherstonhaugh & Co.
Norsk Hydro A.s
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