Title:
METHOD FOR RECOVERING VALUABLE SUBSTANCE
Document Type and Number:
WIPO Patent Application WO/2021/182451
Kind Code:
A1
Abstract:
The present invention provides a method for recovering a valuable substance, by said method a valuable substance being recovered from a lithium ion secondary battery. This method for recovering a valuable substance comprises: a heat treatment step wherein a lithium ion secondary battery is subjected to a heat treatment, thereby obtaining a heat-treated material; a crushing/classifying step wherein a crushed material obtained by crushing the heat-treated material is subjected to classification, thereby obtaining a coarse grain product and a fine grain product, each of which contains the valuable substance; a water leaching step wherein the fine grain product is immersed in water, thereby obtaining a water leaching slurry; a wet magnetic separation step wherein the water leaching slurry is subjected to wet magnetic separation, thereby separating the water leaching slurry into a magnetically attracted material and a magnetically non-attracted material slurry; and an acid leaching step wherein an acidic solution is added to the magnetically non-attracted material slurry obtained by the wet magnetic separation and/or a magnetically non-attracted material obtained by subjecting the magnetically non-attracted material slurry to solid-liquid separation, and solid-liquid separation is performed after leaching the magnetically non-attracted material at a pH of less than 4, thereby obtaining an acid leachate and an acid leaching residue.
Inventors:
NISHIKAWA CHIHIRO (JP)
HONMA YOSHIHIRO (JP)
WATANABE RYOEI (JP)
YAMASHITA MASATAKA (JP)
HONMA YOSHIHIRO (JP)
WATANABE RYOEI (JP)
YAMASHITA MASATAKA (JP)
Application Number:
PCT/JP2021/009222
Publication Date:
September 16, 2021
Filing Date:
March 09, 2021
Export Citation:
Assignee:
DOWA ECO SYSTEM CO LTD (JP)
International Classes:
B09B3/00; C22B1/00; C22B1/02; C22B3/04; C22B3/06; C22B3/22; C22B3/24; C22B3/44; C22B7/00; C22B23/00; C22B26/12; H01M10/54
Foreign References:
| JP2017037807A | 2017-02-16 | |||
| JP2017004920A | 2017-01-05 | |||
| JP2018172732A | 2018-11-08 | |||
| JP2019026916A | 2019-02-21 | |||
| JP2019160429A | 2019-09-19 |
Other References:
See also references of EP 4119244A4
Attorney, Agent or Firm:
HIROTA, Koichi et al. (JP)
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