METHOD FOR RECOVERING METALS

Abstract: provided is a method for recovering metals, which can produce a lithium hydroxide solution from a metal-containing solution and appropriately process the impurities separated at that time. the method for recovering metals from battery powder of lithium ion battery waste includes: an acid leaching step of leaching the metals in the battery powder with an acid to obtain a metal-containing solution containing lithium ions and other metal ions including manganese ions and/or aluminum ions; a metal separation step of separating the other metal ions from the metal-containing solution, the metal separation step comprising extraction of manganese ions and/or aluminum ions from the metal-containing solution into a solvent and, after the extraction, stripping of manganese ions and/or aluminum ions from the solvent into a stripping solution; and, after the metal separation step, an electrodialysis step of subjecting the metal-containing solution containing lithium ions and fluoride ions to electrodialysis using a bipolar membrane to obtain a lithium hydroxide solution and an acidic solution containing fluoride ions, wherein the acidic solution obtained in the electrodialysis step is used as at least part of the stripping solution in the metal separation step.

Inventor(s): Junichi ARAKAWA, Hiromichi KASHIMURA, Eriko KAMIYAMA

CPC Classification: C22B7/007 (Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; {Methods of a general interest or applied to the winning of more than two metals (briquetting of scrap ; preliminary treatment of scrap )})

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