Auto-catalysts were the largest consumers of platinum group metals and the most important secondary resources,recovery of PGMs from spent auto-catalysts by leaching with various acidities were investigated.The leaching thermodynamics of PGMs at 363 K was first discussed.At 363 K the higher the acidities of HC1,the higher the leaching recoveries of PGMs,and the sequence of leaching recovery was Pd＞Pt＞Rh.When H2SO4 used alone,the leaching recoveries of PGMs was low,when the acidity of H2SO4 increasing,the leaching recovery of Rh kept stable.
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