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Recent research in solvent extraction of platinum group metals

Narita, Hirokazu*; Suzuki, Tomoya*; Motokawa, Ryuhei

Most of the refineries for platinum group metals (PGMs) in Japan have adopted solvent extraction methods for mutual separation of PGMs. Few effective extractants for industrial use have been found although some industrial processes were established in 1970s. Recently, some compounds have been reported as candidates for practical PGM extractants in addition to new concepts for PGM extraction mechanisms. In this review article, we present well-known PGM recovery processes based on solvent extraction, industrial extractants and their properties, and conventional extraction mechanism for PGMs. Additionally, we discuss recent interesting extraction systems (amide-type compounds and ionic liquid) and then introduce new extraction concepts based on the specific interactions at the outer-sphere of a metal complex in the organic phase.

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Category:Metallurgy & Metallurgical Engineering

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