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Abstract
Green selective metallurgy of precious metals (PMs) from industrial multi-metal wastes is attracting more attention. Herein, a tandem dissolution strategy of Fe(III) oxalate complex (FOC)-halogen (I/Br) sequential system was put forward. FOC-I system was crucial for selective recovery, which was suitable for Pt dissolution but passivation for Pd recovery, while FOC-Br system was universal for platinum group metals (PGMs) dissolution. The rational design on the stepwise use of FOC-I/FOC-Br system could gradually recover different PMs efficiently. Pt and Pd could be selectively and completely recovered from spent multi-PMs containing cordierite powder catalysts. 92.26% Pt and 94.73% Pd were selectively separated from spent unbroken monolithic cordierite catalysts. And 99.62% Au and 95.50% Pd could also be recovered from unbroken e-wastes, respectively. Oxygen radicals played a crucial role in generation and migration of halogen reactive species such as I (Br)•, I (Br)2, and I (Br)3-. The method for the dissolution of halogen oxidation-coordination in FOC-I/FOC-Br systems was proposed. The recovered Pt/Pd-containing lixivium has been demonstrated to be a suitable precursor solution for the preparation of monolithic honeycomb catalysts used in air purification. The photochemical tandem dissolution in sequential FOC-I/FOC-Br system will pave a way for the development of green metallurgy.
Published Version
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