TY - JOUR
T1 - Effective alloying treatment for platinum using iron chloride vapor
AU - Taninouchi, Yu Ki
AU - Okabe, Toru H.
N1 - Funding Information:
The authors are grateful to Dr. Kasuhiro 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 (Massachusetts Institute of Technology, currently with The University of Tokyo), Dr. Akihiro Yoshimura (Chiba University), and Mr. Ryohei Yagi (The University of Tokyo) for their valuable suggestions and comments. This research was financially supported by the Japan Society for the Promotion of Science (JSPS) through a Grant-in-Aid for Scientific Research (S) (KAKENHI Grant No. 26220910) and by the Mazda Foundation.
Publisher Copyright:
© 2017 The Japan Institute of Metals and Materials.
PY - 2018
Y1 - 2018
N2 - An effective alloying treatment for Pt using FeClx (x = 2, 3) vapor was demonstrated towards developing a novel recovery process for platinum group metals (PGMs) in catalyst scrap. Suitable reaction conditions were discussed from the perspective of thermodynamics, and its validity was confirmed experimentally. When pure Pt samples were reacted with FeCl2 vapor at 1200 K under the coexistence of metallic Fe, an Fe-Pt alloy showing ferromagnetism was easily formed, even though the samples were not in physical contact with the metallic Fe. On the basis of thermodynamic considerations, alloying of Pt mainly proceeds via the disproportionation of FeCl2 vapor, with the gaseous phase containing FeClx acting as the medium to transport Fe from the metallic Fe to the Pt samples. When the alloyed sample was kept under FeCl3 vapor at 1200 K, Fe was removed and ferromagnetism was lost. Therefore, it is concluded that FeCl2 vapor treatment under the coexistence of Fe is a feasible and useful technique for alloying Pt and forming a ferromagnetic Fe-Pt alloy. The results obtained in this study indicate that treatment with FeCl2 vapor followed by magnetic separation has potential as an effective technique for concentrating PGMs directly from catalyst scrap.
AB - An effective alloying treatment for Pt using FeClx (x = 2, 3) vapor was demonstrated towards developing a novel recovery process for platinum group metals (PGMs) in catalyst scrap. Suitable reaction conditions were discussed from the perspective of thermodynamics, and its validity was confirmed experimentally. When pure Pt samples were reacted with FeCl2 vapor at 1200 K under the coexistence of metallic Fe, an Fe-Pt alloy showing ferromagnetism was easily formed, even though the samples were not in physical contact with the metallic Fe. On the basis of thermodynamic considerations, alloying of Pt mainly proceeds via the disproportionation of FeCl2 vapor, with the gaseous phase containing FeClx acting as the medium to transport Fe from the metallic Fe to the Pt samples. When the alloyed sample was kept under FeCl3 vapor at 1200 K, Fe was removed and ferromagnetism was lost. Therefore, it is concluded that FeCl2 vapor treatment under the coexistence of Fe is a feasible and useful technique for alloying Pt and forming a ferromagnetic Fe-Pt alloy. The results obtained in this study indicate that treatment with FeCl2 vapor followed by magnetic separation has potential as an effective technique for concentrating PGMs directly from catalyst scrap.
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U2 - 10.2320/matertrans.M-M2017844
DO - 10.2320/matertrans.M-M2017844
M3 - Article
AN - SCOPUS:85039865035
SN - 1345-9678
VL - 59
SP - 88
EP - 97
JO - Materials Transactions
JF - Materials Transactions
IS - 1
ER -