Direct Electrochemical Extraction of Ti_5Si_3 from Ti/Si-Containing Metal Oxide Compounds in Molten CaCl_2

Direct electrochemical extraction of TisSia 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, respec- tively. The pressed porous cylindrical pellet of the Ti/Si-contalning 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℃ and 3.0--4.0V 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.

Direct electrochemical extraction of Ti5Si3 from pressed cathode pellets comprising of powdered Ti/Sicontaining 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℃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.