WO2024083881 - OXIDATIVE LEACHING OF CARBON-CONTAINING MIXED HYDROXIDE PRECIPITATES
National phase entry:
Publication Number
WO/2024/083881
Publication Date
25.04.2024
International Application No.
PCT/EP2023/078919
International Filing Date
18.10.2023
Title **
[English]
OXIDATIVE LEACHING OF CARBON-CONTAINING MIXED HYDROXIDE PRECIPITATES
[French]
LIXIVIATION OXYDATIVE DE PRÉCIPITÉS D'HYDROXYDE MIXTE CONTENANT DU CARBONE
Applicants **
UMICORE
Inventors
KLAASEN, Bart
Priority Data
22202394.7
19.10.2022
EP
Application details
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International Searching Authority |
EPO
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| Recordal of a Change of the Applicant's Name/Address |
Change of Applicant's Name and Address
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| Type of Assignment |
The Standard Agent's Assignment
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| Applicant's Legal Status |
Legal Entity
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| Entry into National Phase under |
Chapter I
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Send the Letters Patent by Courier
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Quotation for National Phase entry
| Country | Stages | Total | |
|---|---|---|---|
| China | Filing, Examination, Granting | 2055 | |
| EPO | Filing, Examination, Granting | 8617 | |
| Japan | Filing, Examination, Granting | 2185 | |
| South Korea | Filing, Examination, Granting | 2130 | |
| USA | Filing, Examination, Granting | 4740 |
Total:
19,727
The term for entry into the National Phase has expired. This quotation is for informational purposes only
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Abstract[English]
The present invention provides a process for selective leaching of nickel from a mixed hydroxide precipitate comprising nickel, cobalt, manganese and carbon, wherein carbon is comprised as organically bound carbon and/or graphite in an amount of 0.10 to 10.00 wt.% relative to the weight of said mixed hydroxide precipitate, said process comprising the steps of: i. providing a mixed hydroxide precipitate slurry, and at least partially leaching of nickel in said mixed hydroxide precipitate by adding sulphuric acid; ii. oxidizing the at least partially leached mixed hydroxide precipitate slurry from step i. with peroxymonosulphuric acid and/or a salt thereof in an acidic aqueous medium at a pH of at most 4; iii. acidifying the oxidized mixed hydroxide precipitate slurry obtained from step ii. by adding sulphuric acid to dissolve residual amounts of nickel in the solid phase, thereby obtaining a solid phase comprising cobalt and manganese and an aqueous phase comprising nickel sulphate; and iv. separating said solid phase and said aqueous phase.[French]
La présente invention concerne un procédé de lixiviation sélective de nickel à partir d'un précipité d'hydroxyde mixte comprenant du nickel, du cobalt, du manganèse et du carbone, le carbone étant compris en tant que carbone et/ou graphite lié organiquement en une quantité de 0,10 à 10,00 % en poids par rapport au poids dudit précipité d'hydroxyde mixte, ledit procédé comprenant les étapes consistant à : i. fournir une suspension de précipité d'hydroxyde mixte, et lixivier au moins partiellement le nickel dans ledit précipité d'hydroxyde mixte par ajout d'acide sulfurique; ii. oxyder la suspension de précipité d'hydroxyde mixte au moins partiellement lixiviée provenant de l'étape i. avec de l'acide peroxymonosulfurique et/ou un sel de celui-ci dans un milieu aqueux acide à un pH d'au plus 4; iii. acidifier la suspension de précipité d'hydroxyde mixte oxydé obtenue à l'étape ii. en ajoutant de l'acide sulfurique pour dissoudre les quantités résiduelles de nickel dans la phase solide, ce qui permet d'obtenir une phase solide comprenant du cobalt et du manganèse et une phase aqueuse comprenant du sulfate de nickel; et iv. séparer ladite phase solide et ladite phase aqueuse.