| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for recovering lithium from a solution obtained by leaching a fired product including a positive electrode material of a lithium ion secondary battery with water, and containing ions of lithium and fluorine, sulfuric acid, etc., by continuously and simultaneously purifying and concentrating lithium. <P>SOLUTION: An electrolytic cell is partitioned between an insoluble anode and a cathode with a plurality of diaphragms to keep concentration differences between cations and anions in the partitioned chambers, and while uniform concentration is kept in each chamber, a concentration gradient of ions is maintained from the anode side to the cathode side. A stock solution is supplied to a chamber near the middle to extract a lithium ion concentrate from a chamber nearest the cathode of high lithium ion concentration, and to discharge an impurity concentrate from a chamber nearest the anode of high impurity ion concentration. <P>COPYRIGHT: (C)2013,JPO&INPIT |
