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Research Article

Improve titanate reduction by electro-deoxidation of Ca3Ti2O7 precursor in molten CaCl2

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  • Received: 4 April 2020Revised: 11 August 2020Accepted: 12 August 2020Available online: 14 August 2020
  • Low O2- diffusion rate in the electro-deoxidation of titanium-containing compound process, either in OS process or FFC process, leads to low reaction speed and low current efficiency. In this study, Ca3Ti2O7 was used as precursor to improve reduction speed of titanium. Due to more “diffusion channels” created in cathode as Ca2+ liberates from Ca3Ti2O7 precursor in the electro-deoxidation process, O2- diffusion rate was improved significantly by using Ca3Ti2O7 instead of CaTiO3 as precursor. Parallel constant voltage electrolysis (3.2 V) confirms that Ca3Ti2O7 and CaTiO3 reduced simultaneously due to their similar crystal structure. However, the reduction area of Ca3Ti2O7 spreads much faster than that of CaTiO3 indicated that difference in O2- diffusion rate. Cyclic voltammetry (CV), constant voltage and theoretical analysis of crystal structure were also carried out to comparing the difference between Ca3Ti2O7 and CaTiO3. Results indicate that by using precursor with more soluble cations, titanium reduction speed can be greatly improved in the electro-deoxidation process. At last, a new electrolysis method was also proposed to converting and recycling of excess CaO from the Ca3Ti2O7 precursor.
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Improve titanate reduction by electro-deoxidation of Ca3Ti2O7 precursor in molten CaCl2

  • Corresponding author:

    Zhi Wang    E-mail: zwang@ipe.ac.cn

  • 1. Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • 2. Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
  • 3. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Abstract: Low O2- diffusion rate in the electro-deoxidation of titanium-containing compound process, either in OS process or FFC process, leads to low reaction speed and low current efficiency. In this study, Ca3Ti2O7 was used as precursor to improve reduction speed of titanium. Due to more “diffusion channels” created in cathode as Ca2+ liberates from Ca3Ti2O7 precursor in the electro-deoxidation process, O2- diffusion rate was improved significantly by using Ca3Ti2O7 instead of CaTiO3 as precursor. Parallel constant voltage electrolysis (3.2 V) confirms that Ca3Ti2O7 and CaTiO3 reduced simultaneously due to their similar crystal structure. However, the reduction area of Ca3Ti2O7 spreads much faster than that of CaTiO3 indicated that difference in O2- diffusion rate. Cyclic voltammetry (CV), constant voltage and theoretical analysis of crystal structure were also carried out to comparing the difference between Ca3Ti2O7 and CaTiO3. Results indicate that by using precursor with more soluble cations, titanium reduction speed can be greatly improved in the electro-deoxidation process. At last, a new electrolysis method was also proposed to converting and recycling of excess CaO from the Ca3Ti2O7 precursor.

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