High speed pickling bath control

C - Chemistry – Metallurgy – 23 – G

Patent

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Details

C23G 1/02 (2006.01) B08B 1/02 (2006.01) B08B 3/04 (2006.01) C23G 3/00 (2006.01) C23G 3/02 (2006.01)

Patent

CA 2374017

In high speed strip pickling and other treatment such as rinsing and cleaning, the acid or other liquid treating medium tends to be carried along with the strip, which reduces the efficiency of contact of the acid with the strip. The invention addresses this problem by providing a segmented bath, each segment having a deflector (14) over the strip to cause a flow reversal of the acid, which is then guided by an inclined separator panel (10) to the upstream end of the segment and deposited again on the strip. The exit of the segment also includes a constriction to cause the acid to accelerate, creating turbulence, and, on the exit side of the constriction, causing a decrease in pressure, whereby acid is drawn down from above the separator panel (10), which in turn assists the circulation of acid through the flow reversal.

Lors du dérochage rapide d'une bande ou de tout autre traitement tel que le rinçage et le nettoyage, l'acide ou d'autres milieux de traitement liquides ont tendance à être emportés avec la bande, ce qui réduit l'efficacité du contact entre l'acide et ladite bande. Cette invention propose une solution à ce problème, laquelle consiste en un bain segmenté où chaque segment comprend un déflecteur (14) qui est situé au-dessus de la bande et qui va renverser le flux d'acide, ce dernier étant alors guidé par un panneau séparateur incliné (10) vers l'extrémité amont du segment, puis redéposé sur la bande. La sortie du segment comprend également un étranglement qui va faire accélérer l'acide, créant ainsi une turbulence et entraînant une chute de pression sur le côté sortie de l'étranglement. L'acide est ainsi aspiré vers la bas depuis le panneau séparateur (10) qui participe ainsi à la circulation de l'acide dans le flux inverse.

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