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New Dissolution Process of Iridium to Hydrochloric Acid

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Rare Metal Technology 2019

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

Iridium is used in various industrial products, one such application being a thin film catalysis of an oxygen-evolving anode. When iridium and iridium oxide are recovered and purified, they must be dissolved to aqueous solution due to them being chemically stable the dissolution in acid is difficult. Currently, it is dissolved with hydrochloric acid to which chlorine gas is injected but this leads to problems of safety and large environmental load. It is necessary to improve dissolving behavior of iridium in acid. In this study, a method to dissolve iridium to hydrochloric acid is developed. By mixture of metal Ir powder and CaCO3 was heated at 973 K or higher temperature, Ca2IrO4 and Ca4IrO6, complex oxides were synthesized. Iridium in the oxides formed can easily be dissolved in hydrochloric acid.

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Reference

  1. Kasuya R, Miki T, Morikawa H, Tai Y (2014) Development of new dissolution process of platinum via double oxides. J Japan Inst Met Mater 78(7):242–249

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Author information

Authors and Affiliations

  1. Department of Mechanical Science and Engineering, The University of Chiba Institute of Technology, 2-17-1 Tudanuma, Narasino, Chiba, 275-0016, Japan

    Yuto Kobayashi, Shota Yamada & Takashi Nagai

Authors
  1. Yuto Kobayashi
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  2. Shota Yamada
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  3. Takashi Nagai
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Corresponding author

Correspondence to Takashi Nagai .

Editor information

Editors and Affiliations

  1. University of Toronto, Toronto, ON, Canada

    Gisele Azimi

  2. The Pennsylvania State University, University Park, PA, USA

    Hojong Kim

  3. University of Saskatchewan, Saskatoon, SK, Canada

    Shafiq Alam

  4. University of Tokyo, Tokyo, Japan

    Takanari Ouchi

  5. IND LLC, South Jordan, UT, USA

    Neale R. Neelameggham

  6. University of Ilorin, Ilorin, Nigeria

    Alafara Abdullahi Baba

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© 2019 The Minerals, Metals & Materials Society

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Cite this paper

Kobayashi, Y., Yamada, S., Nagai, T. (2019). New Dissolution Process of Iridium to Hydrochloric Acid. In: Azimi, G., Kim, H., Alam, S., Ouchi, T., Neelameggham, N., Baba, A. (eds) Rare Metal Technology 2019. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05740-4_19

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