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作者:

Gao, Jie (Gao, Jie.) | Zhang, Liwen (Zhang, Liwen.) | Li, Guangyue (Li, Guangyue.) | Gao, Yun (Gao, Yun.) | Xi, Xiaoli (Xi, Xiaoli.) (学者:席晓丽)

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摘要:

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.

关键词:

Anodic dissolution Molten salt electrolysis DFT FLiNaK Tungsten metal extraction

作者机构:

  • [ 1 ] [Gao, Jie]Beijing Univ Technol, Collaborat Innovat Ctr Capital Resource Recycling, Beijing 100124, Peoples R China
  • [ 2 ] [Zhang, Liwen]Beijing Univ Technol, Collaborat Innovat Ctr Capital Resource Recycling, Beijing 100124, Peoples R China
  • [ 3 ] [Xi, Xiaoli]Beijing Univ Technol, Collaborat Innovat Ctr Capital Resource Recycling, Beijing 100124, Peoples R China
  • [ 4 ] [Gao, Jie]North China Univ Sci & Technol, Coll Chem Engn, Tangshan 063210, Peoples R China
  • [ 5 ] [Li, Guangyue]North China Univ Sci & Technol, Coll Chem Engn, Tangshan 063210, Peoples R China
  • [ 6 ] [Gao, Yun]North China Univ Sci & Technol, Coll Chem Engn, Tangshan 063210, Peoples R China
  • [ 7 ] [Xi, Xiaoli]Beijing Univ Technol, Fac Mat & Mfg, Key Lab Adv Funct Mat, Minist Educ, Beijing 100124, Peoples R China
  • [ 8 ] [Zhang, Liwen]Beijing Univ Technol, Natl Engn Lab Ind Big Data Applicat Technol, Beijing 100124, Peoples R China

通讯作者信息:

  • [Xi, Xiaoli]Beijing Univ Technol, Collaborat Innovat Ctr Capital Resource Recycling, Beijing 100124, Peoples R China;;[Gao, Yun]North China Univ Sci & Technol, Coll Chem Engn, Tangshan 063210, Peoples R China;;

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来源 :

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS

ISSN: 0263-4368

年份: 2024

卷: 121

3 . 6 0 0

JCR@2022

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SCOPUS被引频次: 1

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