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Enhanced Dissolution of Rh from RhZn3 Formed Through Zn Vapor Pretreatment

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Abstract

A Rh-Zn compound was synthesized by exposing Rh to a fixed pressure of Zn vapor. After keeping Rh and Zn in a sealed container for 10 days at 1173 K and 1093 K (900 °C and 820 °C), respectively, an unreported compound was obtained. Its chemical composition was determined to be RhZn3, and X-ray diffraction analysis revealed it to have a face-centered tetragonal structure (a = b = 3.78 Å and c = 3.88 Å). The dissolution rate of Rh from the RhZn3 in hydrochloric acid was measured using a channel flow, double-electrode method, and it was found to be more than 100 times greater than that from pure Rh. The result verified the possibility of a Rh recovery process in which Rh is exposed to Zn vapor prior to acid leaching to enhance its dissolution.

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Acknowledgments

H. Sasaki appreciates the Research Fellowship for Young Scientist (Grant DC2, No. 20-10341) from the Japan Society for the Promotion of Science (JSPS). This work was supported financially in part by a Grant-in-Aid for JSPS Fellows. It was also supported by the Ministry of the Environment in Japan through a Grant-in-Aid for Scientific Research about Establishing a Sound Material-Cycle Society (Grant K2120). The authors appreciate the assistance offered by Dr. T. Nagai and Mr. H. Kimura (The University of Tokyo).

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Authors and Affiliations

  1. International Research Center for Sustainable Materials, Institute of Industrial Science, University of Tokyo, Meguro, Tokyo, 153-8505, Japan

    Hideaki Sasaki (Project Research Associate) & Masafumi Maeda (Professor)

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  1. Hideaki Sasaki
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  2. Masafumi Maeda
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Correspondence to Hideaki Sasaki.

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Manuscript submitted November 18, 2010.

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Sasaki, H., Maeda, M. Enhanced Dissolution of Rh from RhZn3 Formed Through Zn Vapor Pretreatment. Metall Mater Trans B 43, 443–448 (2012). https://doi.org/10.1007/s11663-012-9637-3

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