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Author:

Li, Ming (Li, Ming.) | Liu, Qing Qing (Liu, Qing Qing.) | Xi, Xiao Li (Xi, Xiao Li.) (Scholars:席晓丽) | Nie, Zuo Ren (Nie, Zuo Ren.) (Scholars:聂祚仁)

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EI Scopus

Abstract:

In this study, a new green approach has been developed for the recovery of tungsten by using tungsten carbide (WC) scrap material as consumable anode in LiCl-KCl molten salts at 773 K to produce metallic tungsten. The feasibility of the direct electrochemical dissolution of WC anode into metallic tungsten was evaluated based on the experimental verifications and electrochemical methods. The effects of the main technical parameters, including the cell voltage, electrolysis time and electrolysis temperature, on the dissolved condition of anode were studied and the optimal anode parameters were obtained. It was found that a large electrolytic voltage, high electrolytic temperature and long electrolysis time would be favorable for the dissolved state of the tungsten carbide anode under the same conditions. The cathode product was analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the tungsten particles with a diameter of 100 nm could be prepared by this process in a molten salt bath. Linear sweep voltammetry was applied to investigate the dissolution of WC anode, and showed that the WC scrap material could be used as consumable anode to produce tungsten powder. Other electrochemical techniques including cyclic voltammetry, square-wave voltammetry and chronopotentiometry were employed to explore the electrochemical properties of tungsten ion derived from WC anode in LiCl-KCl melts. These results confirmed that electroreduction of tungsten ion in the melts proceeded in one step with four exchanged electrons. © 2017 Trans Tech Publications, Switzerland.

Keyword:

Anodes Electrolysis Electrochemical properties Potassium compounds Tungsten Metal ions Dissolution Metal recovery Lithium compounds Scrap metal Fused salts Scanning electron microscopy Metals Ion exchange Cyclic voltammetry Tungsten carbide Electrolytic reduction Chlorine compounds

Author Community:

  • [ 1 ] [Li, Ming]Beijing University of Technology, Beijing, China
  • [ 2 ] [Liu, Qing Qing]Beijing University of Technology, Beijing, China
  • [ 3 ] [Xi, Xiao Li]Beijing University of Technology, Beijing, China
  • [ 4 ] [Nie, Zuo Ren]Beijing University of Technology, Beijing, China

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Source :

ISSN: 0255-5476

Year: 2017

Volume: 898 MSF

Page: 1871-1879

Language: English

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 4

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 9

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