Ion Exchange Resins Selective for the Complexation of Univalent Anions in Aqueous Solutions
AssigneeTechSource, Inc.
InventorGeorge M Murray
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Abstract
Ion exchange resin macroporous beads for the highly selective extraction of univalent anions from aqueous solutions. A specific example is the removal of dicyanoaurate and dicyanoargentate from cyanide leach solutions and tailings. The beads have a maximum number of ligands specific for the desired univalent anion, while maintaining sufficient separation to minimize binding of polyvalent ions. The beads are prepared using a functionalized monomer with the use of a specifically tuned coordinator. The beads can be used as a sensor for detecting the amount of anions captured when interrogated by an appropriate light source.
Claims23
A macroporous ion exchange resin polymer bead comprising:
- a plurality of ligands selective for a specific univalent ion, the ligands co-polymerized with a non-complexing monomer and a crosslinker;
- wherein each ligand comprises a coordination site supplying the appropriate charge for the univalent ion;
- and
- wherein the ligands are sufficiently separated to minimize binding of polyvalent ions to the bead.
A method of making a macroporous ion exchange resin polymer bead, the method comprising:
- preparing a ligand selective for a univalent ion;
- preparing a copolymerizable organic soluble complex comprising the ligand, a non-complexing monomer, and a crosslinker;
- and
- suspension polymerizing the complex to form a macroporous polymer bead comprising the ligand co-polymerized with a with the monomer and the crosslinker, the ligands sufficiently separated to minimize binding of polyvalent ions to the bead.
Dependencies are inferred from the claim text.