Method for separating multivalent metal ions

Details Method for separating multivalent metal ions Method for separating multivalent metal ions

B - Operations, Transporting

01

D

B01D 15/04 (2006.01) B05D 7/14 (2006.01)

Patent

CA 2421250

A method and apparatus are described for removing iron cations and/or zinc cations from an autodeposition coating bath (T1) by passing a limited number of bed volumes through a column (IEX) containing a gel type SAC IEX resin when iron cations are to be removed and passing a substantially larger number of bed volumes through the column (IEX) when zinc cations are to be removed. To prevent clogging when zinc cations are being removed the direction of the flow through the column (IEX) is periodically reversed.

Cette invention concerne un procédé et un appareil permettant de retirer des cations de fer et/ou des cations de zinc d'un bain de dépôt sans courant (T1). A cette fin, on fait passer un nombre limité de volumes de lit au travers d'une colonne (IEX) contenant une résine SAC IEX de type gel pour l'extraction de cations de fer, et un nombre beaucoup plus important de volumes de lit au travers de la colonne (IEX) pour l'extraction de cations de zinc. Pour éviter un phénomène de colmatage pendant l'extraction de cations de zinc, on inverse périodiquement le sens du flux qui traverse la colonne (IEX).

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