Title:
METHOD FOR RECOVERING LITHIUM FROM LITHIUM ION SECONDARY BATTERY
Document Type and Number:
Japanese Patent JP2022164547
Kind Code:
A
Abstract:
To provide a method for recovering lithium from a lithium ion secondary battery, enabling suppression of lithium loss occurring when concentrating lithium leachate obtained by leaching the lithium ion secondary battery with water thereby enabling recovery of high purity lithium at a high recovery rate.SOLUTION: A method for recovering lithium from a lithium ion secondary battery is provided, including: a heat treatment step of heating a lithium ion secondary battery including at least one of cobalt, nickel and manganese at 700°C or higher; a crushing step of crushing the heat treated object of the lithium ion secondary battery obtained in the heat treatment step; a classification step of classifying the crushed object obtained in the crushing step, at a classification point of 0.6 mm or more and 2.4 mm or less to obtain a coarse grain product and a fine grain product; a lithium leaching step of leaching lithium included in the recovered fine grain product into water to obtain a lithium leachate having a lithium concentration of less than 1,500 mg/L; and a membrane separation step of forming the lithium leachate as a first lithium concentrate using a nano filtration (NF) membrane or a reverse osmosis (RO) membrane.SELECTED DRAWING: None
Inventors:
NISHIKAWA CHIHIRO
HONMA YOSHIHIRO
WATANABE AKISHIGE
TABATA SHOTA
HONMA YOSHIHIRO
WATANABE AKISHIGE
TABATA SHOTA
Application Number:
JP2021203793A
Publication Date:
October 27, 2022
Filing Date:
December 16, 2021
Export Citation:
Assignee:
DOWA ECO SYSTEM CO LTD
International Classes:
C22B26/12; C01D15/08; C22B1/02; C22B3/04; C22B3/20; C22B3/42; C22B3/44; C22B7/00; H01M10/54
Attorney, Agent or Firm:
Tadashige Ito
Tadahiko Ito
Koichi Hirota
Yoshihiro Ryu
Naoko Matsuda
Tadahiko Ito
Koichi Hirota
Yoshihiro Ryu
Naoko Matsuda