Dross collecting zinc pot

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 2/00 (2006.01)

Patent

CA 2312356

A zinc-coating pot for galvanizing steel strip has two levels along its bottom surface. The first, shallower level is located under a coating roll, thereby creating an area where the molten zinc-coating metal flow rate is relatively high. Dross particles remain suspended and do not accumulate on the bottom of the zinc-coating pot in this region. A second, deeper level is located to one side of the first level. This second level creates a space wherein the molten metal flow rate is less than the terminal velocity of the dross particles. This encourages sedimentation of the dross particles in this region. It provides an accumulation area for any bottom dross to be later removed by a dross removal mechanism, such as mechanical scoops or by pumping, without interruption to the coating process.

L'invention concerne une cuve de zingage qui sert à galvaniser des bandes d'acier et dont la surface inférieure comporte deux niveaux. Le premier niveau, peu profond, est situé en dessous d'un rouleau de revêtement, créant ainsi une zone dans laquelle le débit du métal de zingage fondu est relativement élevé. Les particules de crasses restent en suspension et ne s'accumulent pas dans cette zone au fond de la cuve de zingage. Le second niveau, plus profond, est situé sur un côté du premier niveau. Ce second niveau créé un espace dans lequel le débit du métal fondu est inférieur à la vitesse finale des particules de crasses. Ceci favorise la sédimentation des particules de crasses dans cette zone, ce qui permet de former une zone d'accumulation destinée à toutes les crasses de fond, lesquelles sont éliminées ultérieurement au moyen d'un mécanisme d'élimination de crasses, telles que des pelles mécaniques, ou par pompage, sans interruption du processus de revêtement.

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