TY - JOUR
T1 - Recovery of Platinum Group Metals from Spent Catalysts Using Iron Chloride Vapor Treatment
AU - Taninouchi, Yu ki
AU - Okabe, Toru H.
N1 - Funding Information:
The authors are grateful to Dr. Katsuhiro Nose (The University of Tokyo, currently with JX Nippon Mining & Metals Corporation), Mr. Tetsuo Watanabe (The University of Tokyo, currently with Tanaka Kikinzoku Kogyo K. K.), Dr. Takanari Ouchi, Mr. Ryohei Yagi, Mr. Akihiro Iizuka (The University of Tokyo) for their valuable suggestions and comments. The authors thank Marusu Glaze Co., Ltd. for providing cordierite powder. This research was financially supported by the Japan Society for the Promotion of Science (JSPS) through the Grant-in-Aid for Scientific Research (S) (KAKENHI Grant No. 26220910) and by the Mazda Foundation.
Publisher Copyright:
© 2018, The Minerals, Metals & Materials Society and ASM International.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - The recovery of platinum group metals (PGMs) from spent automobile catalysts is a difficult process because of their relatively low contents in the scrap. In this study, to improve the efficiency of the existing recycling techniques, a novel physical concentration method involving treatment with FeCl2 vapor has been examined. The reactions occurring between typical catalyst components and FeCl2 vapor are discussed from the thermodynamic point of view, and the validity of the proposed technique was experimentally verified. The obtained results indicate that the vapor treatment at around 1200 K (927 °C) can effectively alloy PGMs (Pt, Pd, and Rh) with Fe, resulting in the formation of a ferromagnetic alloy. It was also confirmed that cordierite and alumina (the major catalyst components) remained unreacted after the vapor treatment, while ceria species were converted into oxychlorides. The samples simulating the automobile catalyst were also subjected to magnetic separation after the treatment with FeCl2 vapor; as a result, PGMs were successfully extracted and concentrated in the form of a magnetic powder. Thus, the FeCl2 vapor treatment followed by magnetic separation can be utilized for recovering PGMs directly from spent catalysts as an effective pretreatment for the currently used recycling methods.
AB - The recovery of platinum group metals (PGMs) from spent automobile catalysts is a difficult process because of their relatively low contents in the scrap. In this study, to improve the efficiency of the existing recycling techniques, a novel physical concentration method involving treatment with FeCl2 vapor has been examined. The reactions occurring between typical catalyst components and FeCl2 vapor are discussed from the thermodynamic point of view, and the validity of the proposed technique was experimentally verified. The obtained results indicate that the vapor treatment at around 1200 K (927 °C) can effectively alloy PGMs (Pt, Pd, and Rh) with Fe, resulting in the formation of a ferromagnetic alloy. It was also confirmed that cordierite and alumina (the major catalyst components) remained unreacted after the vapor treatment, while ceria species were converted into oxychlorides. The samples simulating the automobile catalyst were also subjected to magnetic separation after the treatment with FeCl2 vapor; as a result, PGMs were successfully extracted and concentrated in the form of a magnetic powder. Thus, the FeCl2 vapor treatment followed by magnetic separation can be utilized for recovering PGMs directly from spent catalysts as an effective pretreatment for the currently used recycling methods.
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U2 - 10.1007/s11663-018-1269-9
DO - 10.1007/s11663-018-1269-9
M3 - Article
AN - SCOPUS:85046538812
VL - 49
SP - 1781
EP - 1793
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
SN - 1073-5615
IS - 4
ER -