Title:
LEACHING METHOD, SEPARATION METHOD FOR COBALT AND NICKEL
Document Type and Number:
Japanese Patent JP2023150907
Kind Code:
A
Abstract:
To provide a leaching method that enables efficient acid leaching of an electrode material contained in a lithium ion secondary battery at a low cost without using an excessive amount of reducing agent, and to provide a separation method for cobalt and nickel including said leaching method.SOLUTION: Provided is a leaching method that has a leaching step of acid leaching an electrode material for a lithium ion secondary battery, and the leaching step includes a sulfuric acid addition process of adding sulfuric acid to the electrode material, an iron powder addition process of adding iron powder, and an ORP measurement process of measuring oxidation-reduction potential after the addition of the iron powder and determining a stable oxidation-reduction potential, which is the oxidation-reduction potential at the time when no increase in the oxidation-reduction potential is observed, and the method is characterized in that the iron powder addition process and the ORP measurement process are repeated until the stable oxidation-reduction potential becomes equal to or less than a predetermined value.SELECTED DRAWING: Figure 1
Inventors:
MIYAZAKI ATSUSHI
MURAOKA HIROKI
MURAOKA HIROKI
Application Number:
JP2022060254A
Publication Date:
October 16, 2023
Filing Date:
March 31, 2022
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
C22B7/00; B09B3/70; B09B5/00; C22B1/02; C22B3/08; C22B3/22; C22B3/44; C22B23/00; H01M10/54
Attorney, Agent or Firm:
Yasushi Matsunuma
Mitsuo Teramoto
Fumihiro Hosokawa
Onami Kazunori
Mitsuo Teramoto
Fumihiro Hosokawa
Onami Kazunori