Metal recovery method and dialysis device

摘要

Provided is a valuable-metal recovery method for recovering metals from lithium ion batteries using comparatively simple equipment and without using a cumbersome process. In said method, a positive electrode material from lithium ion batteries, containing lithium and a transition metal, is dissolved in an acidic solution, thereby generating lithium ions and ions of the transition metal in the acidic solution. Said acidic solution and a recovery liquid are then made to flow with an anion-permeable membrane interposed therebetween, causing the lithium ions to permeate from the acidic solution to recovery solution. Lithium ions are then recovered from the recovery liquid containing dissolved lithium ions.

主权项

1. A metal recovery method for recovering metals from a positive electrode material for lithium ion batteries containing lithium and a transition metal element, the method comprising:
an acid leaching step of dissolving the positive electrode material in an acid solution to generate lithium ions and transition metal ions in the acid solution; a dialysis step of flowing the acid solution containing the lithium ions and the transition metal ions and a recovery liquid, with an anion permeable membrane interposed between the acid solution and the recovery liquid, thereby permeating the lithium ions from the acid solution to the recovery liquid; and a lithium recovery step of recovering the lithium ions from the recovery liquid containing the permeated lithium ions; wherein the dialysis step is performed by a process selected from the group consisting of pressure dialysis and centrifugal dialysis.