The electrochemical dissolution mechanism and treatment process in the molten-salt electrolytic recovery of WC-Co two-phase scraps

Zhang, Qinghua; Xi, Xiaoli; Zhang, Liwen; Feng, M. S.; Nie, Zuoren; Ma, Liwen

doi:10.1016/j.jelechem.2021.115219

Cited by 7 publications

(2 citation statements)

References 32 publications

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“…At present, dry reprocessing technology includes molten salt electrore ning [4][5][6], oxide electrodeposition [7][8][9], reduction extraction using molten salt and liquid metal [10,11], as well as uoride volatilization [12]. Among them, molten salt electrore ning, involving in anodic dissolution [13][14][15] and cathodic electrodeposition processes [16][17][18][19][20], has the advantages of short process ow, small amount of radioactive waste, and low critical risk, and is considered to be the most promising dry reprocessing technology for spent fuel. In order to improve uranium utilization and reduce the volume of nuclear waste, the electrochemical extraction of uranium and rare earth elements (REs) from LiCl-KCl molten salt was studied [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical formation of Pr aided by additive (KF) in LiCl-KCl molten salt

Li,

Du,

Wei

et al. 2024

Preprint

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In order to investigate the influences of the additive (KF) on electrochemistry and deposit morphology of Pr, various electrochemical techniques were used to comparative investigate the electroreduction potential and diffusion coefficient of Pr3+ and kinetic properties of Pr3+/Pr in LiCl-KCl-PrCl3 before and after the addition of KF at different molar concentration ratio of F− to Pr3+ (k). Cyclic voltammetry, square wave voltammetry and reverse chronopotentiometry results showed that the value of k (k = 0, 1, 2, 3 and 4) had no effect on reduction mechanism of Pr3+. With the increase of k, the reduction peak potential moved in the negative direction, the diffusion coefficient decreased, and diffusion activate energy increased. Meanwhile, the exchanged current densities (j0), charge transfer resistances (Rct), and activate energies (Ea) were measured at different k by linear polarization technique, which illustrated that with the augment of k, j0 gradually reduced, and Ea and Rct increased. Furthermore, the electrochemical preparation of Pr aided by KF was explored by potentiostatic electrolysis at different k, and the products were characterized by XRD, SEM and EDS, which indicated that with the increase of k, the morphology of metallic Pr changed from slender needles to granular.

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Section: Introductionmentioning

confidence: 99%

Electrochemical formation of Pr aided by additive (KF) in LiCl-KCl molten salt

Li,

Du,

Wei

et al. 2024

Preprint

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“…There are several methods of recycling spent cemented carbides, including the zinc process, hightemperature process, cold stream method and electrochemical method [4]. The electrochemical method is favored because of its advantages, such as simple equipment and easy process control.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Tungsten Recovery from Spent Cemented Carbide by Molten Salt Electrodeposition

Xing

Feng

et al. 2023

J. Electrochem. Sci. Technol

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The accumulation of spent carbide (YG8), not only pollutes the environment but also causes waste of tungsten, cobalt and other rare metal resources. To better address this issue, we proposed a combined electrochemical separation process of lowtemperature aqueous solution and high-temperature molten salt for tungsten and cobalt. H 2 WO 4 was obtained from spent carbide in an aqueous solution, and we calcined it to obtain WO 3 , which was used as a raw material to obtain tungsten by using molten salt electrodeposition. The influence of the current efficiency and the electrochemical behavior of the discharge precipitation of W(VI) were also studied. The calcination results showed that the morphology of WO 3 was regular and there were no other impurities. The maximum current efficiency of 82.91% was achieved in a series of electrodeposition experiments. According to XRD and SEM analysis, the recovered product was high purity tungsten, which belongs to the simple cubic crystal system. In the W(VI) reduction mechanism experiments, the electrochemical process of W(VI) in NaCl-Na 2 WO 4 -WO 3 molten salt was investigated using linear scanning voltammetry (LSV) and chronoamperometry in a three-electrode system. The LSV showed that W(VI) was reduced at the cathode in two steps and the electrode reaction was controlled by diffusion. The fitting results of chronoamperometry showed that the nucleation mechanism of W(VI) was an instantaneous nucleation mode, and the diffusion coefficient was 7.379×10 -10 cm 2 •s -1 .

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