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Preparation and Reaction Mechanism of Metallic Vanadium by Rapid Electro-deoxidization in Molten Fluorides
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Affiliation:

1.Northeastern University,1.Northeastern University,1.Northeastern University,1.Northeastern University,1.Northeastern University

Clc Number:

TF841.3

Fund Project:

Fundamental Research Funds for the Central Universities(N110402007,N130102002)

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    Abstract:

    By using NH4VO3 as raw material, high-active V2O3 cathode pellets were prepared by reduction with coal gas and in-situ sintering, then were directly reduced to metallic vanadium by rapid electro-deoxidization in molten fluorides. The mechanism of V2O3 electro-deoxidization was studied by cyclic voltammetry experiments and constant potential electrolysis experiments. The results indicate that the rapid electro-deoxidization of V2O3 can be realized in molten fluorides, metallic vanadium containing 0.218 wt% oxygen can be obtained after 4 h electrolysis. The in-suit formation of aluminium-oxygen-fluorine complex ions, which further forming aluminum metal in deoxidation reaction zone, caused aluminum thermal reduction reaction of V2O3 cathode. So direct electro-deoxidation reduction and aluminum thermal reaction of V2O3 both existed in the deoxidation process of V2O3 cathode, and the latter reaction played a key role in acceleration action. Electro-deoxidization process of V2O3 cathode can be enhanced effectively by adding aluminium oxide in molten fluorides, the electrolytic time can be shortened to 3 h with other conditions unchanged.

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[Kong Yapeng, Li Binchuan, Chen Jianshe, Liu Kuiren, Han Qing. Preparation and Reaction Mechanism of Metallic Vanadium by Rapid Electro-deoxidization in Molten Fluorides[J]. Rare Metal Materials and Engineering,2018,47(6):1824~1829.]
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History
  • Received:May 06,2016
  • Revised:June 07,2016
  • Adopted:July 15,2016
  • Online: September 06,2018
  • Published: