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 to preserve the natural environment. However, several factors limit the efficiency of PGM recovery in current recycling processes. Specifically, PGMs represent a small proportion of the entire catalyst and are difficult to dissolve in aqueous solutions for subsequent separation. In recent decades, multiple technologies have been developed to make the recycling of PGMs more efficient and environmentally-friendly. Herein, we introduce the typical industrial processes for recovering PGMs from spent catalysts, along with established and emerging trends in the technological development of PGM recycling. Furthermore, we review novel recycling techniques for converting PGMs in spent catalysts into more soluble states and/or physically concentrating PGMs from spent catalysts.

Automated summary

Spent automobile catalysts are a vital resource for platinum group metals (PGMs), and their recycling is crucial for ensuring a steady supply and protecting the environment. However, current recycling processes face challenges in terms of PGM recovery efficiency. In recent years, advancements have been made in developing more efficient and environmentally-friendly PGM recycling techniques. This article discusses typical industrial processes for recovering PGMs from spent catalysts and reviews emerging technologies for converting PGMs into more soluble forms and physically concentrating them from spent catalysts.