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Author:

Gao, J. (Gao, J..) | Zhang, L. (Zhang, L..) | Li, G. (Li, G..) | Gao, Y. (Gao, Y..) | Xi, X. (Xi, X..)

Indexed by:

EI Scopus SCIE

Abstract:

Molten salt electrolysis is an innovative technology applied to recover tungsten from the scrap of cemented carbide, which enables the realization of energy saving and consumption reduction goals. Currently, numerous studies have focused on the molten salt electrolysis of chlorine salt systems, but still face challenges including low electrolysis efficiency and salt volatilization. Here, we propose to employ the FLiNaK molten salt system for recovering tungsten from the scrap cemented carbide and analyze the feasibility of the dissolution of WC occurring at the anode from the perspective of thermodynamics and electrochemical polarization curves. Moreover, the influence of electrolysis temperature on the dissolution of the anode is also investigated and the productions are identified as nano-flake tungsten powder by characterizing the cathode product using XRD, SEM, EDS, and XPS. A two-step reduction mechanism of W ions was analyzed by electrochemical means such as CV, SWV, etc., and the ionic groups stabilized by W6+ and W4+, and F− in the molten salts were deduced to be WF33+ and WF3+ by DFT simulation calculations. This work provides new guidance for the application of molten salt electrolysis in the recovery of tungsten from scrap cemented carbide. © 2024 Elsevier Ltd

Keyword:

DFT Molten salt electrolysis FLiNaK Anodic dissolution Tungsten metal extraction

Author Community:

  • [ 1 ] [Gao J.]Collaborative Innovation Center of Capital Resource-Recycling Material Technology, Beijing University of Technology, Beijing, 100124, China
  • [ 2 ] [Gao J.]College of Chemical Engineering, North China University of Science and Technology, Tangshan, 063210, China
  • [ 3 ] [Zhang L.]Collaborative Innovation Center of Capital Resource-Recycling Material Technology, Beijing University of Technology, Beijing, 100124, China
  • [ 4 ] [Zhang L.]National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
  • [ 5 ] [Li G.]College of Chemical Engineering, North China University of Science and Technology, Tangshan, 063210, China
  • [ 6 ] [Gao Y.]College of Chemical Engineering, North China University of Science and Technology, Tangshan, 063210, China
  • [ 7 ] [Xi X.]Collaborative Innovation Center of Capital Resource-Recycling Material Technology, Beijing University of Technology, Beijing, 100124, China
  • [ 8 ] [Xi X.]Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China

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Source :

International Journal of Refractory Metals and Hard Materials

ISSN: 0263-4368

Year: 2024

Volume: 121

3 . 6 0 0

JCR@2022

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 10

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