Recycling of Precious Metals from Automotive Catalyst Residue by Leaching: Comparison of HCl-H{sub}2O{sub}2 Solution System with Traditional Aqua Regia (First Report)

摘要

Since various valuable metals are used in automobile, it becomes a very important issue to recover these metals from ELVs as considering of the sustainable development of society. The present work revealed the recovery of platinum, palladium and rhodium from automotive catalyst residue after hydrogen reduction pretreatments by using a mild HCl-H{sub}2O{sub}2 solution system. Higher dissolution of precious metals (Pd, Pt and Rh) was achieved by using the mild chloride solution as compared with the traditional aqua regia solution system. Additionally, the primary evaluation of the leaching behavior from a kinetic point of view was also conducted.