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US 12,467,117 B2Granted
Method of recovering iridium
AssigneeSyddansk Universitet
InventorsShuang Ma Andersen, Raghunandan Sharma
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Abstract
The present invention relates to a method of recovering iridium in the form of iridium solutions, metal, oxides or salts from a body, such as a spent catalyst, comprising iridium oxides.
Claims10
A method of recovering iridium from a body comprising IrxOy nanoparticles, wherein x is a number between 1 and 2 and y is a number between 1 and 4, wherein said body is a spent catalyst for water electrolysis, wherein said method comprises:
- contacting said body with a reducing agent, wherein said reducing agent is an aqueous solution of hydrazine having a mean weight percent concentration wt % higher than 35%, thereby forming a suspension;
- and
- dissolving said suspension by exposing said suspension to an acidic solution, wherein said acid solution comprises hydrogen halides having a concentration between 0.5 M to 1 M and one or more halide salts, thereby forming a solution comprising iridium ions.
Dependencies are inferred from the claim text.