Separation of rhodium from iridium through synergistic solvent extraction

Andrew I. Carrick, Jane Patrick, Emma R. Schofield, Paul O'Shaughnessy, Barbara Breeze, Jason B. Love*, Carole A. Morrison

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

There are currently few effective processes for the solvent extraction of rhodium from hydrochloric acid streams, and none that allow rhodium to be selectively extracted over iridium. Realizing this goal could allow rhodium to be recovered earlier in a typical platinum group metal (PGM) refining flowsheet and reduce the environmental impact of PGM refining. In this work, we show that a synergistic combination of a tert-alkyl primary amine LA and various inner-sphere ligands L can be used to recover rhodium via the complex [RhCl5L].HLA2. Although we show that rhodium is extracted by several extractant combinations, it is only readily stripped from the amine/amide synergistic mixture. As this extraction relies on the inner-sphere coordination of the amide to the metal, this process also demonstrates a route to obtain preferential extraction of rhodium over more inert iridium chloridometalates under industrially relevant conditions.

Original languageEnglish
Article number125893
JournalSeparation and Purification Technology
Volume333
Early online date29 Nov 2023
DOIs
Publication statusE-pub ahead of print - 29 Nov 2023

Keywords / Materials (for Non-textual outputs)

  • Circularity
  • Critical metals
  • Hydrometallurgy
  • Selectivity
  • Solvent extraction
  • Synergistic

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