Solvent extraction in platinum group metal processing

Abstract

Abstract This paper indicates the various ways in which the chemistry of the platinum group metals (PGM) can be manipulated to achieve separations using solvent extraction techniques and is not intended to be a comprehensive review of published work. Differences in the chemistry of PGM and base metals are emphasised as the latter are present in refinery liquors. Mechanisms of solvent extraction processes are discussed and related to PGM complex chemistry. Potential economic advantages for solvent extraction over conventional selective precipitation processes are considered.