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首页> 外文会议>The 23rd International Conference on Solid Waste Technology and Management(ICSW 2008) >Process Development for the Recovery of PGMs from Catalytic Converters
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Process Development for the Recovery of PGMs from Catalytic Converters

机译：从催化转化器回收PGM的工艺开发

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The research was systematically conducted to develop of a recovery process for precious-metals from spent auto catalytic converters; a secondary source of PGMs. Batch experiments included leaching, solvent extraction, stripping, etc. Hydrochloric acid was used to leach out the metals from the catalytic converters at 30-50℃ followed by solvent extraction earned out at room temperature using trioctyl amine (TOA) in toluene as extracting solution. At 50℃, 98% of Pt, 95% of Pd, and 99% of Rh were leached using 8 M HCl (acid/solid = 20 ml/g). For 2 wt% TOA, it was found that Pt and Pd were transferred into the organic phase leaving Rh in the aqueous solution. Nitric acid was the most effective stripping agent compared with hydrogen peroxide and hydrochloric acid. Direct recycling of organic phase for extraction after stripping significantly decreased the extraction efficiency. In order to maintain the extraction performance, a removal of acid in the organic phase was required. Finally, the overall precious-metal recovery process for catalytic converter and the analysis of process economics are presented.
机译：系统地进行了研究，以开发一种从废旧自动催化转化器中回收贵金属的方法；铂族金属的次要来源。批量实验包括浸出，溶剂萃取，汽提等。使用盐酸从30-50℃的催化转化器中浸出金属，然后在室温下使用甲苯中的三辛胺（TOA）作为萃取溶液进行溶剂萃取。在50℃下，使用8 M HCl（酸/固体= 20 ml / g）浸出98％的Pt，95％的Pd和99％的Rh。对于2wt％的TOA，发现Pt和Pd转移到有机相中，而Rh留在水溶液中。与过氧化氢和盐酸相比，硝酸是最有效的剥离剂。汽提后直接回收有机相进行萃取，显着降低了萃取效率。为了保持萃取性能，需要除去有机相中的酸。最后，介绍了催化转化器的整个贵金属回收工艺，并对工艺经济性进行了分析。

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