Patent ID: 7189380
Filing Date: 2007-03-13
Classification: C22B,Y02P

Abstract:
1. A method comprising: (a) providing contact between an aqueous solution containing one or more metal anion complexes and an organic solution including a diquaternary amine, wherein the diquaternary amine has two diquaternary nitrogenes spaced at a distance of less than about 10 Å; (b) selectively binding at least one of the one or more metal anion complexes to the diquaternary amine; (c) separating the organic solution from the aqueous solution, wherein the diquaternary amine having the selectively bound metal anion complexes are concentrated in the organic solution and the balance of the one or more metal anion complexes are concentrated in the aqueous solution; and (d) back-extracting the selectively bound metal anion complexes from the diquaternary amine into an aqueous acid.