| Platinum group metals(PGMs)resources are scarce in China, sorecovering PGMs from secondary resources is of great significance for sustainable development and environmental protection.The research progress of PGMs recovery inautomobile exhaust-gas catalystswas reviewed.The recovery processes includepretreatment, enrichment, refining and separation.Pretreatment is to open the wrapping of waste catalystsand increase the interface contact with solution. Enrichment is the most critical step for recovering waste catalysts. The wet enrichment process is cumbersome andhas disavatanges oflong cycle, generating large amount of wastewater andunstable recovery rate. Pyrometallurgical enrichment mainly focuses on the metal smelting and trapping of iron, lead, copper and matte. The smelting process of lead and matte produces toxic substances, whilethe cost of copper enrichment is expensive. However, iron trapping has the benefits of economy, low cost, short process flow and no pollution. It is one of the development directions for treating automobile exhaust catalysts in the future. The refining and separation steps include precipitation, extraction, ion exchange and electrolysis which is the future direction. |
