Direct electrochemical extraction of Ti5Si3 from Ti/Si-containing metal oxide compounds in molten CaCl2 |
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| Authors: | ZOU Xing-li LU Xiong-gang XIAO Wei ZHOU Zhong-fu ZHONG Qing-dong DING Wei-zhong |
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| Affiliation: | 1. Shanghai Key Laboratory of Modern Metallurgy and Materials Processing,School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
2. Shanghai Key Laboratory of Modern Metallurgy and Materials Processing,School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;Centre for Advanced Functional Materials and Devices, Aberystwyth University, Aberystwyth SY23 3BZ, UK |
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| Abstract: | Direct electrochemical extraction of Ti5Si3 from pressed cathode pellets comprising of powdered Ti/Si-containing metal oxide compounds was investigated by using molten salt electro-deoxidation technology. Three groups of mixtures including TiO2 mixed with SiO2, Ti-bearing blast furnace slag (TBFS) mixed with TiO2, and TBFS mixed with high-titanium slag (HTS) were prepared at the same stoichiometric ratio (Ti: Si = 5: 3) corresponding to the target composition of Ti5Si3, and used as the starting materials in this experiment, respectively. The pressed porous cylindrical pellet of the Ti/Si-containing compounds served as a cathode, and two different anode systems, i.e., the inert solid oxide oxygen-ion-conducting membrane (SOM) based anode system and graphite-based anode system were used contrastively. The electrochemical experiment was carried out at 900–1050°C and 3.0–4.0 V in molten CaCl2 electrolyte. The results show that the oxide components were electro-deoxidized effectively and Ti5Si3 could be directly extracted from these complex Ti/Si-containing metal oxide compounds. |
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| Keywords: | electro-deoxidation oxide compounds Ti5Si3 molten salts solid oxide oxygen-ion-conducting membrane (SOM) |
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