Treatment of nickel-containing waste water on phosphating

Details Treatment of nickel-containing waste water on phosphating Treatment of nickel-containing waste water on phosphating

C - Chemistry, Metallurgy

02

F

C02F 1/42 (2006.01) B01J 39/00 (2006.01) B01J 39/04 (2006.01) B01J 45/00 (2006.01) C23C 22/86 (2006.01)

Patent

CA 2429156

Method for the treatment of a nickel-containing waste water, comprising a phosphate bath overflow and/or the rinsing water after phosphating, whereby the phosphating is carried out with an acidic aqueous phosphate solution, containing 3 to 50 g/l phosphate ions, calculated as PO4-3, 0.2 to 3 g/l zinc ions, 0.01 to 2.5 g/l nickel ions, optionally further metal ions and optionally accelerator. The phosphate bath overflow and/or post-phosphating rinsing water are run over a weakly acidic ion-exchanger, characterised in that the acid groups of the ion exchanger are neutralised with alkali metal ions to no more than 15 % and that on supplying the nickel-containing aqueous solution to the ion exchanger said solution has a pH value in the range 2.5 to 6Ø

L'invention concerne un procédé de traitement d'une solution aqueuse au nickel renfermant un excès de bain de phosphatation et/ou d'eau de rinçage après phosphatation, ladite phosphatation étant effectuée à l'aide d'une solution phosphatée aqueuse acide contenant de 3 à 50 g/l d'ions phosphates, calculés sous forme de PO¿4??-3¿, de 0,2 à 3 g/l d'ions zinc, de 0,01 à 2,5 g/l d'ions nickel, éventuellement d'autres ions métalliques et éventuellement un accélérateur, et l'excès de bain de phosphatation et/ou l'eau de rinçage après phosphatation étant acheminé vers un échangeur d'ions faiblement acide. Ce procédé est caractérisé en ce que les groupes acides de l'échangeur d'ions sont neutralisés à pas plus de 15 % d'ions de métaux alcalins et que la solution aqueuse au nickel présente un pH compris entre 2,5 et 6, lors de son chargement sur l'échangeur d'ions.

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