Abstract
Acids such as aqua regia, a 3:1 mixture of hydrochloric acid (HCl) and nitric acid, that contain strong oxidizing agents are used in the dissolution-based recovery of platinum group metals (PGMs). However, nitrate-nitrogen emission has become subject to increasingly strict environmental regulations in recent years. Accordingly, we herein propose a dissolution process for PGMs via the formation of complex oxides using HCl alone. We prepared complex oxides of alkali metals and rhodium (Rh), which is particularly hard to dissolve, and investigated their dissolution behaviors in HCl. Rh-containing complex oxides were prepared by calcining Rh powder and alkali metal salts in air, and dissolution tests using HCl were conducted on the complex oxides obtained. It was found that Rh-containing complex oxides were completely dissolved under appropriate calcination and dissolution conditions.
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This study was supported by a Grant from the Environment Research and Technology Development Fund (3K163010) of the Environmental Restoration and Conservation Agency (ERCA).
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Manuscript submitted May 30, 2019.
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Kasuya, R., Nomura, K. & Narita, H. Solubilization of Rhodium in Hydrochloric Acid Using an Alkali Metal Salt Method. Metall Mater Trans B 51, 377–385 (2020). https://doi.org/10.1007/s11663-019-01740-8
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DOI: https://doi.org/10.1007/s11663-019-01740-8