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Report No.

Precious metal separations

Narita, Hirokazu*; Kasuya, Ryo*; Suzuki, Tomoya*; Motokawa, Ryuhei  ; Tanaka, Mikiya*

The increasing use of precious metals (PMs) in industrial products such as electronics and catalysts has been increasingly important in PM separations. Most of PM separation and purification processes are performed using acidic chloride solutions; therefore, understanding of chemical properties and separation mechanisms of PM chloridometalates in solution is of key importance for improving the processes. This article focuses on solvent extraction of PMs from acidic chloride solutions as the main technology for the mutual separation of PMs and extensively covers the classical and modern methods. In addition, leaching methods, dominant species in acidic chloride solutions, and non-solvent extraction separation methods are also described.



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