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Dissolution Process of Palladium in Hydrochloric Acid: A Route via Alkali Metal Palladates

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Abstract

To improve the safety of the Pd recovery processes that use toxic oxidizers, dissolution of Pd in hydrochloric acid with alkali metal palladates was investigated. Alkali metal palladates were prepared by calcining a mixture of Pd black and alkali metal (Li, Na, and K) carbonates in air. Almost the entire amount of Pd was converted into Li2PdO2 after calcination at 1073 K (800 °C) using Li2CO3. In contrast, PdO was obtained by calcination at 1073 K (800 °C) using Na and K carbonates. Our results indicated that Li2CO3 is the most active reagent among the examined alkali metal carbonates for the formation of palladates. In addition, dissolution of the resulting Li2PdO2 in HCl solutions was evaluated under various conditions. In particular, Li2PdO2 rapidly dissolved in diluted (0.1 M) HCl at ambient temperature. Solubility of Pd of Li2PdO2 was found to be 99 pct or larger after dissolution treatment at 353 K (80 °C) for 5 minutes; in contrast, PdO hardly dissolved in 0.1 M HCl. The dissolution mechanism of Li2PdO2 in HCl was also elucidated by analysis of crystal structures and particulate properties. Since our process is completely free from toxic oxidizers, the dissolution process via alkali metal palladates is much safer than currently employed methods.

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Acknowledgment

This study was supported by a Grant-in-Aid for Challenging Exploratory Research, No. 23656566 from The Naito Science & Engineering Foundation.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimo-Shidami, Moriyama-ku, Nagoya, 463-8560, Japan

    Ryo Kasuya (Senior Researcher), Takeshi Miki (Senior Researcher), Hisashi Morikawa (Senior Researcher) & Yutaka Tai (Group Leader)

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  1. Ryo Kasuya
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  2. Takeshi Miki
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  3. Hisashi Morikawa
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  4. Yutaka Tai
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Correspondence to Ryo Kasuya.

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Manuscript submitted July 10, 2014.

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Kasuya, R., Miki, T., Morikawa, H. et al. Dissolution Process of Palladium in Hydrochloric Acid: A Route via Alkali Metal Palladates. Metall Mater Trans B 46, 2476–2483 (2015). https://doi.org/10.1007/s11663-015-0431-x

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