Electrode reaction of Pr on Sn electrode and its electrochemical recovery from<scp>LiCl‐KCl</scp>molten salt

Han, Wei; Wang, Wei; Zhang, Yongqiang; Wang, Yijie; Li, Mei; Yangshan, Sun

doi:10.1002/er.6394

Cited by 15 publications

(5 citation statements)

References 71 publications

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“…Figure presents the CV curves of LiCl-KCl molten salt in the absence and presence of K 2 ZrF 6 . In blank molten salt (see Figure a), only a pair of redox electrical signals R1/O1(−2.42/–2.31 V) is observed in the range from −2.6 to −0.4 V, which corresponds to the reduction/oxidation of metallic Li Figure b displays the CV curve after adding K 2 ZrF 6 in the blank molten salt.…”

Section: Resultsmentioning

confidence: 97%

“…In blank molten salt (see Figure 1a), only a pair of redox electrical signals R1/O1(−2.42/−2.31 V) is observed in the range from −2.6 to −0.4 V, which corresponds to the reduction/oxidation of metallic Li. 20 Figure 1b displays the CV curve after adding K 2 ZrF 6 in the blank molten salt. Compared with Figure 1a, a reduction and two oxidation signals appear, but these signals are not clear.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Electrochemical Recovering Zr from Molten Salt Using an Fe Electrode

Han

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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To recover zirconium (Zr) from LiCl-KCl molten salt, the electro-reduction mechanisms and dynamic and thermodynamic properties of Zr(IV) on W and Fe electrodes were investigated using a series of electrochemical techniques. Zr(IV) was reduced by a continuous two-step process to form metallic Zr on the W electrode and a one-step process to form various Zr–Fe alloy compounds on the Fe film electrode. The deposition potentials pertaining to the formation of various Zr–Fe intermetallics were found more positive than those of Zr(II)/Zr and Zr(IV)/Zr(II)pairs. Furthermore, the dynamic data of the Zr(II)/Zr pair on the W electrode and the ZrFe3/Zr(IV) pair on the Fe film electrode were measured by linear polarization and Tafel methods. The results indicated that, with an increasing temperature, the value of the exchange current density for the two pairs increased, while the charge transfer resistance and transfer coefficient of the two pairs decreased. The thermodynamic data, for instance, the activities of Zr in Zr–Fe alloys and Gibbs free energies of the formation of Zr–Fe intermetallic compounds, were estimated using open-circuit chronopotentiometry. Furthermore, electrochemical recovering Zr was conducted using an Fe electrode by potentiostatic and galvanostatic electrolysis, which proved that the products were only ZrFe2 intermetallic compounds. The recovery efficiencies were 98.05% and 98.97%, respectively.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrochemical Recovering Zr from Molten Salt Using an Fe Electrode

Han

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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“…Then, referencing current and potential parameter results, the appropriate potential and current are selected for electrolysis to extract the lanthanides. Therefore, the electrochemical behavior of lanthanides on different cathodes has been studied extensively, including Al, − Ni, − Zn, − Mg, − Sn, , Cu, − Bi, − and Pb. ,, The study of electrochemical processes on different electrodes provides basic experimental data for the extraction and separation of lanthanides. In this study, a Sn membrane and liquid tin were used as cathodes to extract neutron poisoning neodymium from molten salt.…”

Section: Introductionmentioning

confidence: 99%

Efficient Recovery of the Fission Element Neodymium by Electrodeposition from Molten LiCl–KCl and Research on the Thermodynamics and Dynamics of Processes

Wang

Liu

Quan

et al. 2022

ACS Sustainable Chem. Eng.

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The efficient extraction of neodymium, a neutron poison, is of great significance in the dry reprocessing process for the nuclear fuel cycle. The electrochemical extraction of neodymium on a tin electrode has been studied in molten salts by various electrochemical methods, and its kinetic and thermodynamic parameters have been provided. The calculated values of the diffusion coefficient and diffusion activity energy for Sn(II) and Nd(III) on the W electrode are 1.34 × 10–5 to 3.54 × 10–5 cm2 S–1/36.17 kJ mol–1 and 2.18 × 10–5 to 3.06 × 10–5 cm2 S–1/31.19 kJ mol–1, respectively. The deposition mechanism and precipitation potential sequence of Sn(II) and Nd(III) for the W electrode were studied in detail by cyclic voltammetry and open circuit chronopotential, and the formation enthalpy and entropy of Sn3Gd intermetallic compound are −271.9 kJ mol–1 and −55.9 J mol–1 K–1. According to the analysis of the electrochemical potential parameters, the appropriate potential and current were selected for the electrolysis experiments. Therefore, the fission product neodymium is deposited on the liquid tin cathode via potentiostatic/galvanostatic technologies. X-ray diffraction analysis and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy were used to characterize the cathode alloy samples. The average recovery rate of neodymium on the liquid tin cathode is about 99.08% by multiple analysis of inductively coupled plasma atomic emission spectrometry.

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“…Compared with the solid cathode, the liquid metal cathode has been widely studied because of its constant surface area and easy diffusion of deposits to liquid metal. Jiao et al [24] summarized liquid metals from the aspects of properties, depolarization effects, alloy preparation, etc., such as liquid Bi [25][26][27][28], Pb [29][30][31][32], Sn [33][34][35][36], and Ga [37][38][39][40], which provided a reference for molten salt electrorefining.…”

Section: Introductionmentioning

confidence: 99%

Electroextraction of Ytterbium on the Liquid Lead Cathode in LiCl-KCl Eutectic

Zhu

Tang

et al. 2022

Crystals

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The reduction mechanisms of Yb(III) on W electrodes in molten LiCl-KCl-YbCl3 were explored at 773 K, and the diffusion coefficient of Yb(III) was determined. Then, various electrochemical techniques were employed to investigate the electroreduction of Yb(III) in molten LiCl-KCl on a liquid Pb film and Pb electrode. Electrochemical signals were associated with forming Pb3Yb, PbYb, Pb3Yb5, and PbYb2. The deposition potentials and equilibrium potentials of four Pb-Yb intermetallics were obtained through open-circuit chronopotentiometry. Metallic Yb was extracted by potentiostatic electrolysis (PE) on a liquid Pb electrode, and XRD analyzed the Pb-Yb alloy obtained at different extraction times. The recovered Yb was found in the form of Pb3Yb and PbYb intermetallics. The extraction efficiency of Yb was calculated according to ICP analysis results, and extraction effectivity could attain 94.5% via PE at −1.86 V for 14 h.

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Electrode reaction of Pr on Sn electrode and its electrochemical recovery fromLiCl‐KClmolten salt

Cited by 15 publications

References 71 publications

Electrochemical Recovering Zr from Molten Salt Using an Fe Electrode

Electrochemical Recovering Zr from Molten Salt Using an Fe Electrode

Efficient Recovery of the Fission Element Neodymium by Electrodeposition from Molten LiCl–KCl and Research on the Thermodynamics and Dynamics of Processes

Electroextraction of Ytterbium on the Liquid Lead Cathode in LiCl-KCl Eutectic

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