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In this study, WC-10Co cemented carbide scrap was used as a consumable anode to separate and prepare tungsten and cobalt powders in NaF-KF melts at 1073 K. The feasibility of direct electrochemical dissolution of WC main phase to produce metallic tungsten was analyzed by thermodynamic calculations and experimental verifications. Furthermore, a series of electrolysis experiments were performed under constant cell voltage for selective preparation of tungsten and cobalt powders. The results show that metal cobalt powder was obtained at <= 0.6 V whereas metal tungsten powder was produced between 0.6 V and 1.2 V. The analysis of cathode products using scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) show that tungsten and cobalt powders can be prepared in NaF-KF melts. Finally, linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were used to investigate the dissolution of WC-10Co anode. The electrochemical properties of tungsten and cobalt ions in NaF-KF melts were studied by cyclic voltammetry (CV) and square wave voltammetry (SWV). The results show that WC-10Co anode could be used to produce tungsten and cobalt powders and the electroreduction of tungsten and cobalt ions in NaF-KF melts was achieved through a one-step reaction involving the transfer of two electrons.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
ISSN: 1572-6657
Year: 2019
Volume: 833
Page: 480-489
4 . 5 0 0
JCR@2022
ESI Discipline: CHEMISTRY;
ESI HC Threshold:166
JCR Journal Grade:1
Cited Count:
WoS CC Cited Count: 22
SCOPUS Cited Count: 22
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0
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