WO2025238330 - A METHOD OF RECOVERING IRIDIUM IN A PLATINUM GROUP METAL REFINING PROCESS
National phase entry is expected:
Publication Number
WO/2025/238330
Publication Date
20.11.2025
International Application No.
PCT/GB2025/050287
International Filing Date
14.02.2025
Title **
[English]
A METHOD OF RECOVERING IRIDIUM IN A PLATINUM GROUP METAL REFINING PROCESS
[French]
PROCÉDÉ DE RÉCUPÉRATION D'IRIDIUM DANS UN PROCÉDÉ DE RAFFINAGE DE MÉTAL DU GROUPE DU PLATINE
Applicants **
JOHNSON MATTHEY PUBLIC LIMITED COMPANY
Inventors
SLACK, Thomas
RICHARDS, Stephen Paul
Priority Data
2406804.1
14.05.2024
GB
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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| Patent Delivery |
Send the Letters Patent by Courier
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| Translation |
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Quotation for National Phase entry
| Country | Stages | Total | |
|---|---|---|---|
| China | Filing, Examination, Granting | 2024 | |
| EPO | Filing, Examination, Granting | 8126 | |
| Japan | Filing, Examination, Granting | 2155 | |
| South Korea | Filing, Examination, Granting | 2071 | |
| USA | Filing, Examination, Granting | 4740 |
Total:
19,116
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Abstract[English]
A method of recovering iridium in a platinum group metal refining process, the method comprising: dissolving iridium from a solid iridium containing material into an aqueous solvent to produce an iridium containing solution, wherein the iridium containing solution is acidic and/or is acidified by addition of an acid after dissolution of the iridium; adding an aliphatic polyamine to the acidic iridium containing solution to precipitate the iridium as an iridium polyamine salt; and separating the precipitated iridium polyamine salt from the acidic solution, characterized in that a majority of the iridium is dissolved in its +3 oxidation state and remains in its +3 oxidation state throughout the precipitation and separation steps.[French]
L'invention concerne un procédé de récupération d'iridium dans un procédé de raffinage de métal du groupe du platine, le procédé consistant à : dissoudre de l'iridium à partir d'un matériau contenant de l'iridium solide dans un solvant aqueux pour produire une solution contenant de l'iridium, la solution contenant de l'iridium étant acide et/ou étant acidifiée par ajout d'un acide après dissolution de l'iridium; ajouter une polyamine aliphatique à la solution acide contenant de l'iridium pour précipiter l'iridium en tant que sel de polyamine d'iridium ; et séparer le sel de polyamine d'iridium précipité de la solution acide, caractérisé en ce qu'une majorité de l'iridium est dissoute dans son état d'oxydation +3 et reste dans son état d'oxydation +3 tout au long des étapes de précipitation et de séparation.