Trends of Technological Development of Platinum Group Metal Recycling: Solubilization and Physical Concentration Processes

Spent automobile catalysts are the most important secondary resource for platinum group metals (PGMs), and their recycling is essential not only to ensure a steady supply of PGMs but also preserve natural environment. However, several factors limit efficiency PGM recovery in current processes. Specifically, represent small proportion entire catalyst difficult dissolve aqueous solutions subsequent separation. In recent decades, multiple technologies have been developed make more efficient environment-friendly. Herein, we introduce typical industrial processes recovering from spent as well established emerging trends technological development recycling. Furthermore, review novel techniques converting into soluble states and/or physically concentrating catalysts.