Treatment of aqueous rinsing solutions from zinc phosphating...

Details Treatment of aqueous rinsing solutions from zinc phosphating... Treatment of aqueous rinsing solutions from zinc phosphating...

C - Chemistry, Metallurgy

02

F

C02F 1/42 (2006.01) B01J 39/04 (2006.01) C23C 22/12 (2006.01) C23C 22/86 (2006.01)

Patent

CA 2141841

Abstract of the Disclosure A process is disclosed for treating aqueous rinsing solutions from zinc phosphat- ing processes on metallic surfaces. The solutions containing heavy metal ions are con- tacted with solid, strongly acid cation exchange resins containing sulfonic acid groups, and the heavy metal ions are then re-extracted from the loaded exchange resins by means of dilute, aqueous nitric acid or of a dilute, aqueous mixture of nitric acid/ phosphoric acid. The eluate from the regeneration is preferably returned to the phosphating bath.

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