HYDROMETALLURGICAL METHOD FOR NICKEL OXIDE ORE

WIPO Patent Application WO/2024/024930

A1

The purpose of the present invention is to reduce the amount of neutralizing agent used in a hydrometallurgical process of nickel oxide ore without lowering the recovery of nickel.　The present invention provides a hydrometallurgical method for nickel oxide ore, the hydrometallurgical method comprising a leaching step S4, a preliminarily neutralization step S5, a solid-liquid separation step S6 for a leachate slurry after the preliminarily neutralization step S5, a neutralization step S7 for achieving a final neutralized solution that contains nickel by separating a neutralized sediment that contains impurity elements by adjusting the pH of the leachate, a sulfurization step S8, and a final neutralization step S9. In the preliminarily neutralization step S5, a slurry for a preliminarily neutralization treatment is used as a pH adjusting agent, the slurry having a magnesium content in the solid content of 3% by weight or more and a nickel content in the solid content of 0.7% by weight or more.

WO/2000/048944	IMPROVED METHODS FOR LEACHING OF ORES
WO/2013/152487	LATERITE-NICKEL ORE PROCESSING METHOD FOR EFFICIENTLY RECOVERING NICKEL RESOURCES
JP2003147444	METHOD FOR RECOVERING VALUABLE METAL FROM METAL CYANIDE-CONTAINING SOLUTION

OHARA GO (JP)
HIGUCHI HIROTAKA (JP)
ENOMOTO MANABU (JP)

PCT/JP2023/027703

February 01, 2024

July 28, 2023

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SUMITOMO METAL MINING CO (JP)

C22B23/00; C22B3/08; C22B3/22; C22B3/44

WO2005098061A1

2005-10-20

JP2015000835A	2015-01-05
JP2020158819A	2020-10-01
JP2007077459A	2007-03-29
JP2021008654A	2021-01-28
JP2020076129A	2020-05-21
JP2019065341A	2019-04-25
JP2020028858A	2020-02-27
JP2013095971A	2013-05-20
JP2021030101A	2021-03-01

SHOBAYASHI Masayuki et al. (JP)

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