Frontier of Recycling Technology for Precious Metals II

Taninouchi, Yu‐ki; Okabe, Toru H.

doi:10.2320/jinstmet.jpr2021901

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2023

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“…Commercial SAC recycling has been operated by pyrometallurgy as the pretreatment for the solubilization of inert PGMs [4]. However, the massive energy consumption of pyrometallurgy (typically operated at temperatures higher than 1300 K) has been a great concern from an economic standpoint.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrophobicity of Ionic Liquids on the Leaching Selectivity of Platinum from a Spent Automotive Catalyst

HANADA,

TAKAOKA,

KAMISONO

et al. 2023

SERDJ

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Recycling platinum group metals from secondary resources such as spent automotive exhaust catalysts is promising for the circular economy. However, the selective separation of Pt over massive amounts of impurity metals such as Mg and Al is particularly challenging. In this study, non-aqueous direct leaching of platinum from a spent automotive catalyst (SAC) using hydrophobic ionic liquids, namely, trihexyl(tetradecyl)phosphonium chloride (P 66614 Cl) and trioctyl(dodecyl)phosphonium chloride (P 88812 Cl) with the aid of pre-loading hydrochloric acid/hydrogen peroxide was proposed. The more hydrophobic P 88812 Cl exhibited more efficient and selective leaching of Pt over Mg and Al. The recovery of Pt from the metal-loaded P 88812 Cl, and the reusability of the IL for SAC leaching were also demonstrated.

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Section: Introductionmentioning

confidence: 99%