Method for dissolving and recovering iridium and rhodium

The alkali melting and sulfuric acid treatment method effectively dissolves and recovers iridium and rhodium from platinum group metals, addressing inefficiencies in existing methods by enhancing dissolution rates and reducing ruthenium content.

JP2026092886APending Publication Date: 2026-06-08DOWA METALS & MINING CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
DOWA METALS & MINING CO LTD
Filing Date
2024-11-27
Publication Date
2026-06-08

AI Technical Summary

Technical Problem

Existing methods for separating and recovering iridium (Ir) and rhodium (Rh) from platinum group metals (PGMs) are inefficient, requiring multiple solvent extraction steps and high costs, especially when ruthenium (Ru) is present, and conventional acid leaching simultaneously leaches Ir and Rh with Ru, complicating separation.

Method used

An alkali melting process followed by an acid addition step using sulfuric acid to dissolve iridium and rhodium, with conditions set to maintain low ruthenium content, volatilize and separate ruthenium, and enhance the dissolution of iridium and rhodium.

Benefits of technology

The method achieves efficient dissolution and recovery of iridium and rhodium with high dissolution rates and low ruthenium content, allowing for easier separation and recovery of these valuable metals.

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Abstract

In particular, the present invention provides a method for efficiently dissolving iridium and rhodium and facilitating their recovery, and further provides a method for recovering Ir and Rh-containing materials from a mixture containing Ir, Rh, and Ru while maintaining a low Ru content. [Solution] A method for dissolving iridium and rhodium, comprising the steps of: dissolving a mixture containing at least one of iridium and rhodium and ruthenium in an alkali to obtain an alkali molten product; and adding an acid to the alkali molten product or a solid derived from the alkali molten product, wherein the step of adding the acid dissolves at least one of iridium and rhodium.
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