Electrochemical recycling of Pd andAg fromsimulated high-level liquid waste

You-binWANG,RuiZOU,Yue-zhouWEI,TsuyoshiARAI,ToyohisaFUJITA,

doi:10.1016/S1003-6326(22)65852-7

Transactions of Nonferrous Metals Society of China >

2022 , Vol. 32 >Issue 3: 1031 - 1040

DOI: https://doi.org/10.1016/S1003-6326(22)65852-7

Mining, Minerals Processing and Metallurgical Engineering

Electrochemical recycling of Pd andAg fromsimulated high-level liquid waste

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You-bin WANG^1,2, Rui ZOU^1,2, Yue-zhou WEI^1,2, Tsuyoshi ARAI³, Toyohisa FUJITA^1,2

1. School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;
2. Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning 530004, China;
3. Department of Material Science and Engineering, Shibaura Institute of Technology, Tokyo 3-9-14, Japan

Online published: 2022-03-25

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Abstract

For the recycling of Pd and Ag from high-level liquid waste (HLLW), the electrochemical behaviors of Pd and Ag in the simulated HNO₃ solutions were investigated by cyclic voltammetry and potentiostatic deposition.Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to observe the deposits morphology and to evaluate their composition. The results indicate that the formation of NO₂^- helps to dissolve Ag while Ag is electrodeposited. When Pd and Ag are electrodeposited together, more metals are gained in the same time, and the deposited Ag does not dissolve in this situation.The metals are electrodeposited completely at the potentials from-0.4 to-0.6 V (vs MSE)and the deposits contain Ag and PdH_x. The electrodeposition of Pd can boost hydrogen evolution, and then the reaction between H₂ and NO₂^- is sped up, thereby lowering the concentration of NO₂^- and inhibiting the dissolution of Ag.

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You-binWANG,RuiZOU,Yue-zhouWEI,TsuyoshiARAI,ToyohisaFUJITA, . Electrochemical recycling of Pd andAg fromsimulated high-level liquid waste[J]. Transactions of Nonferrous Metals Society of China, 2022 , 32(3) : 1031 -1040 . DOI: 10.1016/S1003-6326(22)65852-7

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