Metal ions and/or complexes of metal ions are removed from a solution by formation of an insoluble chelated complex of the metal ions and a polymeric precipitating agent. A two-step process of mixing the influent with the precipitating agent is used to induce rapid precipitation and obtain large, self-agglomerated...http://www.google.de/patents/US5993668?utm_source=gb-gplus-sharePatent US5993668 - Method for removing metal ions and/or complexes containing metal ions from a solution
