Method for recovering valuable metals selectively from mixed spent batteries

摘要

The present invention relates to a method for recovering valuable metals selectively from waste mixed batteries, which comprises the following steps: (a) obtaining a metal mixture containing iron (Fe), nickel (Ni) and lanthanum (La) from a waste mixed battery comprising a spent Ni-Mh battery; and (b) increasing an acidic leach solution and an Eh value to the metal mixture to increase leaching of Ni, and adding an oxidizing agent to precipitate La to obtain a leach solution, wherein the leach solution includes residues in which Fe and La are precipitated. The method for recovering valuable metals selectively from waste mixed batteries also comprises a step (c) for recovering La by adding a solution in which pH is controlled to the residue.