Patent ID: 6514414
Filing Date: 2003-02-04
Classification: C22B,Y02P,Y10S

Abstract:
A process for the separation and removal of iron ions from a basic zinc solution comprising said iron ions, said process comprising the steps of:(a) contacting an aqueous basic zinc solution that comprises said iron ions with a solid ion exchange resin comprising an insoluble cross-linked polymer, said polymer comprising at least one pendant phosphonate group; (b) maintaining said contact at a pH of from about 8 to about 12, and a temperature of from about 10Â° C. to about 90Â° C., for a time period sufficient to form solid phase-bound iron ions and a liquid phase containing the aqueous basic zinc solution having an iron ion concentration that is substantially reduced compared to the solution from (a); (c) separating the solid phase-bound iron ions and the liquid phase; and (d) contacting the solid phase-bound iron ions with an aqueous acidic solution under conditions sufficient to regenerate the solid ion exchange resin.