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作者:

Xi, Xiaoli (Xi, Xiaoli.) (学者:席晓丽) | Xiao, Xiangjun (Xiao, Xiangjun.) | Nie, Zuoren (Nie, Zuoren.) (学者:聂祚仁) | Zhang, Liwen (Zhang, Liwen.) | Ma, Liwen (Ma, Liwen.)

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摘要:

Molten salt electrolysis is used to separate and recycling of elemental tungsten and cobalt from cemented carbides. WC-6 wt% Co scrap and NaCl-KCl molten salt was used as a sacrificial anode and electrolyte, respectively. The range of preparation parameters and the electrochemical behavior of tungsten and cobalt ions were investigated through electrochemical techniques, such as cyclic voltammetry (CV) and square wave voltammetry (SWV). Results showed that the dissolution potential of cobalt and WC were 0 V and 0.6 V (vs. Ag/AgC1), and the reduction potentials of Co (II) + 2e(-) <-> Co (0) and W(II) + 2e(-) <-> W (0) were -0.2 and 0.2 V (vs. Ag/AgC1), respectively. The reduction processes of Co(II) to Co and W(II) to W were both reversible reactions controlled by ion diffusion. The average diffusion coefficients of Co(II) and W(II) were determined by CP to be 5.62 x 10(-5) sand 3.94 x 10(-5) cm(2) s(-1), respectively. Furthermore, the products at cathodes Nos. 1 and 2 were characterized by scanning electron microscopy, X-ray fluorescence and X-ray diffraction analyses. Results showed that pure cobalt and WC powder with a diameter of < 100 nm was obtained at cathode No. 1 and cathode No. 2. And the result of XRF shows that the purity of the products both Co and WC were higher than 90%. This study reveals that cobalt and tungsten can be separated from WC-6 wt% Co scrap by controlling process parameters during electrolysis.

关键词:

Electrochemical behavior Molten salt Separation WC-6 wt% co scrap

作者机构:

  • [ 1 ] [Xi, Xiaoli]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Xiao, Xiangjun]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Nie, Zuoren]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Zhang, Liwen]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Ma, Liwen]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

通讯作者信息:

  • 聂祚仁

    [Nie, Zuoren]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

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来源 :

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

ISSN: 1572-6657

年份: 2017

卷: 794

页码: 254-263

4 . 5 0 0

JCR@2022

ESI学科: CHEMISTRY;

ESI高被引阀值:127

中科院分区:2

被引次数:

WoS核心集被引频次: 16

SCOPUS被引频次: 15

ESI高被引论文在榜: 0 展开所有

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