Recovery of Metallic Pd with High Purity from Pd/Al2O3 Catalyst by Hydrometallurgy in HCl 


Vol. 26,  No. 4, pp. 270-278, Dec.  2020
10.7464/ksct.2020.26.4.270


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  Abstract

Palladium (Pd) has been widely used in various industrial applications such as jewelry, catalyst, and dental materials despite its limited resources. It has been gaining attention to recover Pd with high purity from the spent materials. This study investigated the optimum conditions for the leaching and recovery of metallic Pd. The leaching parameters are HCl concentration, temperature, time, concentration of oxidants, and pulp density. 97.2% of Pd leaching efficiency was obtained in 3 M HCl with 3 vol% oxidants at 80℃ for 60 min. The ratio of hydrogen peroxide to sodium hypochlorite played a critical role in the leaching efficiency due to the supply of Cl- ions in the leachate. Moreover, the complete recovery of Pd in the leachate was achieved at 80℃ with 0.3 formic acid/leachate after adjusting the pH value of 7. This situation was ascribed to the decomposition of formic acid into hydrogen gas and carbon dioxide at 80℃. ICP-AES and XRD characterized the recovered Pd powder, and the purity of the recovered powder was found to be 99.6%. Consequently, the recovered Pd powder with high purity could be used in circuits, catalyst precursors, and surgical instruments.

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  Cite this article

[IEEE Style]

K. YE, B. MY, B. JH, L. KY, L. MS, "Recovery of Metallic Pd with High Purity from Pd/Al2O3 Catalyst by Hydrometallurgy in HCl," Clean Technology, vol. 26, no. 4, pp. 270-278, 2020. DOI: 10.7464/ksct.2020.26.4.270.

[ACM Style]

Kim YE, Byun MY, Baek JH, Lee KY, and Lee MS. 2020. Recovery of Metallic Pd with High Purity from Pd/Al2O3 Catalyst by Hydrometallurgy in HCl. Clean Technology, 26, 4, (2020), 270-278. DOI: 10.7464/ksct.2020.26.4.270.

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pISSN : 1598 - 9712
eISSN : 2288 - 0690

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