Selective Recovery of Platinum Group Metals from Spent Automotive Catalysts by Leaching and Solvent Extraction
Selective Recovery of Platinum Group Metals from Spent Automotive Catalysts by Leaching and Solvent Extraction
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DOI：
10.1252/jcej.19we093
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发表时间：
2019-11-01
影响因子：
0.8
通讯作者：
Goto, Masahiro
中科院分区：
文献类型：
--
作者：
Firmansyah, Mochamad L.;Kubota, Fukiko;Goto, Masahiro
铂族金属（PGMs）作为尾气催化剂的关键组分在汽车工业中发挥着重要作用。鼓励从废品等二次资源中回收铂族金属，以确保其可持续性。目前需要一种高效且环境友好的铂族金属分离技术。以三辛基十二烷基氯化磷（P8，8，8，12 Cl）离子液体（IL）为萃取剂，研究了从废汽车催化剂中回收铂族金属（PGM）的方法。首先，研究了P8，8，8，12 Cl从催化剂中的浸出。从mol L ~（-1）HCl浸出液中选择性萃取Pt、Pd至未稀释液中。随后，将Rh从调节至适当HCl浓度的萃余液中萃取至新鲜P8，8，8，12 Cl中。Pt和Pd的相互分离可以通过汽提过程进行。一些常见的金属共提取铂族金属，如铁，铜，锌，被删除的每个剥离过程。回收高纯度的Pt，Pd和Rh是通过所提出的回收工艺实现的。结果表明，使用基于鳞的离子液体的分离可用于回收铂族金属。
Platinum group metals (PGMs) play an important role in the automotive industry as key components of exhaust catalysts. Recycling of PGMs from secondary resources, such as waste products, is encouraged to ensure their sustainability. A highly efficient and environmentally benign technique for the separation of PGMs is currently required. In the present study, the recovery of PGMs from a spent automotive catalyst was investigated using the trioctyldodecyl phosphonium chloride (P8,8,8,12Cl) ionic liquid (IL) as the PGM extraction solvent. First, leaching P8,8,8,12Cl from the catalyst was investigated. Pt and Pd are selectively extracted into undiluted from the mol L-1 HCI leachate containing various metals together with Pt, Pd, and Rh. Subsequently, Rh is extracted into fresh P8,8,8,12Cl from the raffinate adjusted to an appropriate HCl concentration. Mutual separation of Pt and Pd is possible by stripping processes. Some common metals coextracted with PGMs, such as Fe, Cu, and Zn, are removed by each stripping process. Recovery of high purity Pt, Pd, and Rh is achieved by the proposed recycling process. The results demonstrate that separation using phosphonium-based ILs is useful for recycling PGMs.