Patent ID: 6517701
Filing Date: 2003-02-11
Classification: C22B,Y02P

Abstract:
A process for recovering lead, zinc, and manganese from an aqueous solution containing these metals, comprising:(a) selecting solvent extractant able to preferentially extract lead in the presence of zinc and manganese, from the solution; (b) providing that the solution is free of interfering metals; (c) extracting the interferant-free solution with selected solvent extractant in an amount sufficient to extract the lead and separating the loaded extractant phase from the solution; (d) selecting solvent extractant able to preferentially extract zinc in the presence of manganese; (e) extracting the lead-free solution with selected solvent extractant in an amount sufficient to extract the zinc and separating the loaded extractant phase from the solution; (f) selecting solvent extractant able to preferentially extract manganese in the presence of any residual metals; (g) extracting the lead- and zinc-free solution with selected solvent extractant in an amount sufficient to extract the manganese and separating the loaded extractant phase from the solution; (h) separately stripping each loaded extractant phase to move lead, zinc and manganese into separate aqueous acid strip solutions; and (i) recovering, in a selected form, lead, zinc and manganese from the corresponding strip solutions.