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.
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.
FUJITA KOUJI
KAWAKAMI SATOSHI
| JP2003530988A | 2003-10-21 | |||
| JPS4731572A | ||||
| JPS6259853A | 1987-03-16 | |||
| JPS63302352A | 1988-12-09 | |||
| JPS6098348A | 1985-06-01 | |||
| JPS58147639A | 1983-09-02 | |||
| JPS63256104A | 1988-10-24 | |||
| JPS56108868A | 1981-08-28 | |||
| JPS61163281A | 1986-07-23 | |||
| JP2001508925A | 2001-07-03 | |||
| JPS5579010A | 1980-06-14 |
Kenji Wada
Next Patent: PREPARATION METHOD FOR DENITRATION CATALYST