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Improve titanate reduction by electro-deoxidation of Ca 3 Ti 2 O 7 precursor in molten CaCl 2
International Journal of Minerals, Metallurgy and Materials ( IF 5.6 ) Pub Date : 2020-12-30 , DOI: 10.1007/s12613-020-2165-2
Dong Wang , Sheng Pang , Chun-yue Zhou , Yan Peng , Zhi Wang , Xu-zhong Gong

The low O2− diffusion rate in the electro-deoxidation of titanium containing compounds by either the OS process or the FFC process leads to a low reaction speed and a low current efficiency. In this study, Ca3Ti2O7 was used as a precursor to improve the reduction speed of titanium. Because of the greater number of “diffusion channels” created in cathode as Ca2+ liberates from Ca3Ti2O7 precursor in the electro-deoxidation process, the 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 are reduced simultaneously because of their similar crystal structures. However, the reduction area of Ca3Ti2O7 spreads much faster than that of CaTiO3, indicating a difference in the O2− diffusion rate. Constant voltage cyclic voltammetry (CV) and theoretical analysis of the crystal structure were also conducted to compare the differences between Ca3Ti2O7 and CaTiO3. The results indicate that using a precursor with a greater number of soluble cations, titanium reduction speed can be greatly improved in the electro-deoxidation process. Finally, a new electrolysis method for converting and recycling excess CaO from the Ca3Ti2O7 precursor was proposed.



中文翻译:

通过在熔融的CaCl 2中对Ca 3 Ti 2 O 7前体进行电脱氧来提高钛酸盐的还原

通过OS工艺或FFC工艺对含钛化合物进行电脱氧时,O 2-扩散速率低,导致反应速度低和电流效率低。在这项研究中,Ca 3 Ti 2 O 7被用作前驱体以提高钛的还原速度。由于在电脱氧过程中,当Ca 2+从Ca 3 Ti 2 O 7前驱体释放时,在阴极产生的“扩散通道”数量增加,因此使用Ca 3 Ti 2 O 7可以显着提高O 2-的扩散速率。代替CaTiO 3作为先驱。平行恒压电解(3.2 V)证实Ca 3 Ti 2 O 7和CaTiO 3由于它们相似的晶体结构而同时被还原。但是,Ca 3 Ti 2 O 7的还原面积比CaTiO 3的还原面积扩散快得多,表明O 2-扩散速率不同。还进行了恒压循环伏安法(CV)和晶体结构的理论分析,以比较Ca 3 Ti 2 O 7和CaTiO 3之间的差异。。结果表明,使用具有大量可溶性阳离子的前体,可以在电脱氧过程中大大提高钛的还原速度。最后,提出了一种新的电解方法,用于从Ca 3 Ti 2 O 7前体中转化和回收多余的CaO 。

更新日期:2020-12-30
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