Leaching of Pt, Pd and Rh from Automotive Catalyst Residue in Various Chloride Based Solutions
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概要
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Platinum-group metals (PGM) are important precious metals in many industrial fields. However, their natural resource deposits are strictly limited. Accordingly, their recycling process from wastes and/or secondary resources must be considered. In this study, the leaching of PGM from automotive catalyst residue was performed based on the formation of their chloro-complexes in various concentration of acidic solution. The recovery of platinum, palladium and rhodium from the samples after hydrogen reduction pretreatments was examined in the leaching process by using a mild solution mixture of NaClO–HCl and H<SUB>2</SUB>O<SUB>2</SUB> at 65°C for 3 h. Effect of other solution mixtures on the extraction of the precious metals was also compared with NaClO–HCl–H<SUB>2</SUB>O<SUB>2</SUB>, such as HCl–H<SUB>2</SUB>O<SUB>2</SUB> and NaClO–HCl. The optimum condition to dissolve platinum, palladium and rhodium was achieved by the mixture of 3 vol% NaClO, 5 kmol·m<SUP>−3</SUP> HCl and addition of 1 vol% H<SUB>2</SUB>O<SUB>2</SUB>. The recovery of platinum, palladium and rhodium after 3 h leaching reaches 88%, 99%, 77%, respectively.
- The Japan Institute of Metals and Materialsの論文
The Japan Institute of Metals and Materials | 論文
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