Method for repairing electrolysis cathodes

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 7/02 (2006.01)

Patent

CA 2446644

The invention relates to a method for repairing electrolysis cathodes that, together with anodes in a galvanic bath provided for carrying out a galvanic electrolysis, are connected to a power source. The electrolysis cathodes are comprised of a crossbeam, which is arranged above the galvanic bath for being electrically connected to at least one supply bar, and of a metal cathode that projects into the galvanic bath. At least one portion of the cathode sheet metal is detached from the crossbeam by subjecting it to thermal action in an essentially uniform manner in the area of a first cutting edge. In order to provide a second cutting edge, a replacement sheet metal is cut to size at least in the area of an extension, which can be turned towards the crossbeam, by subjecting it to thermal action in an essentially uniform manner. The replacement sheet metal is welded to the first cutting edge in the area of the second cutting edge by subjecting the sheet metal to thermal action in an essentially uniform manner.

La présente invention concerne un procédé permettant la réparation de cathodes d'électrolyse qui, avec des anodes, sont connectées à une source de courant dans un bain galvanique pour permettre la mise en oeuvre d'une électrolyse galvanique. Les cathodes d'électrolyse sont constituées d'un support transversal disposé au-dessus du bain galvanique pour permettre le contact électrique avec au moins une barre de connexion, et d'une cathode métallique dépassant dans le bain galvanique. Au moins une partie de la plaque cathodique est séparée du support transversal grâce à l'application d'une contrainte thermique sensiblement uniforme au niveau d'une première arête. Pour permettre la formation d'une seconde arête, une lame de remplacement est découpée au moins au niveau d'un élargissement qui peut être dirigé vers le support transversal, grâce à l'application d'une contrainte thermique sensiblement uniforme. La plaque de remplacement est soudée à la première arête grâce à l'application d'une contrainte thermique sensiblement uniforme au niveau de la seconde arête.

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