SEPARATION METHOD FOR COBALT AND NICKEL

Japanese Patent JP2023150694

A

To provide a separation method for cobalt and nickel in which cobalt and nickel are collected from a lithium ion secondary battery at low cost.SOLUTION: A separation method for cobalt and nickel includes a crushing and classifying step of crushing and classifying a lithium ion secondary battery to yield an electrode material, a cleaning step of cleaning the electrode material with water and collecting alkaline cleaning waste liquid, a leaching step of immersing the electrode material cleaned in the cleaning step in a treatment liquid containing sulfuric acid to yield a leachate, a copper precipitation step of adding a hydrogen sulfide compound to the leachate and stirring, followed by solid-liquid separation to yield an eluate containing cobalt and nickel and a residue containing copper sulfide, a first treatment step or a second treatment step that includes a neutralization process and a filtration process, and a cobalt-nickel separation step of adding a hydrogen sulfide compound to the eluted liquid generated in the first treatment step or the neutralized liquid generated in the second treatment step, followed by stirring and solid-liquid separation to yield a precipitate containing cobalt sulfide and nickel sulfide, and a residual liquid containing lithium.SELECTED DRAWING: Figure 1

WO/2012/103617	DIRECT PURIFICATION OF A NICKEL LATERITE LEACHING EFFLUENT
WO/2013/108645	HYDROGEN SULFIDE GAS PRODUCTION PLANT AND METHOD FOR RECOVERING AND USING WASTE HYDROGEN SULFIDE GAS
WO/2009/152560	SAPROLITE NEUTRALISATION OF HEAP LEACH PROCESS

MIYAZAKI ATSUSHI
MURAOKA HIROKI

JP2022059918A

October 16, 2023

March 31, 2022

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MITSUBISHI MATERIALS CORP

C22B23/00; C22B1/02; C22B3/08; C22B3/44; C22B7/00; H01M10/54

Yasushi Matsunuma
Mitsuo Teramoto
Fumihiro Hosokawa
Onami Kazunori

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