Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1987-06-15
1988-07-12
Niebling, John F.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204 67, 264 401, 264105, 264118, 264119, 373 89, 373151, 373 88, C25B 1112
Patent
active
047568143
ABSTRACT:
The invention relates to a method for the individual marking of precooked anodes used in the production of aluminum by electrolysis in the Hall-Heroult process, and to the anodes produced thereby. These anodes are produced by hot compaction of a carbonaceous paste, and according to the invention, during or immediately after such compaction, a plurality of impressions is formed in the upper part of each anode. The impressions are depressions and/or relief portions, constitute a digital coding for the identification number of each anode, and remain legible until withdrawal of the components of the butt of the worn anode from the electrolysis tank. The marking can be carried out using a binary or ternary code, where the reference plane of the zone of the anode which carries the marking corresponds to a first digit, with other digits corresponding to depressions of a particular depth, depressions of a greater depth, or relief portions.
REFERENCES:
patent: 3705947 (1971-10-01), Persson
patent: 4659442 (1987-04-01), Naterstad et al.
Jonville Christian
Van Voren Claude
Aluminum Pechiney
Niebling John F.
Rubino Kathryn
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