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胡蒙均,马通祥,高雷章,赖平生,屈正峰,温良英,胡丽文,邱贵宝,扈玫珑.制钛过程中阴极钙钛矿的形成与阳极溢出气体间的关系[J].稀有金属材料与工程(英文),2019,48(7):2146~2150.[Hu Mengjun,Ma Tongxiang,Gao Leizhang,Lai Pingsheng,Qu Zhengfeng,Wen Liangying,Hu Liwen,Qiu Guibao and Hu meilong.Dependency of gases released from the anode on perovskite formed in the cathode in the process of the preparation of titanium[J].Rare Metal Materials and Engineering,2019,48(7):2146~2150.]
Dependency of gases released from the anode on perovskite formed in the cathode in the process of the preparation of titanium
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Received:January 17, 2018  Revised:April 13, 2018
DOI:
Key words: molten-salt electrolysis  perovskite  Anodic gas
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Hu Mengjun,Ma Tongxiang,Gao Leizhang,Lai Pingsheng,Qu Zhengfeng,Wen Liangying,Hu Liwen,Qiu Guibao and Hu meilong  
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Abstract:
      Perovskite is the inevitable phase formed in the cathode during electrolysis of TiO2 in molten CaCl2 by FFC Cambridge process. Dependency of perovskite in the cathode on gases released from the anode in the process of the preparation of titanium is studied. The results show that three stages is obtained based on the phases formed in the cathode including formation of perovskite, deoxygenation from perovskite and titanium suboxides to TiO and deoxygenation from TiO to Ti . Perovskite formed in the cathode is close related with gases released from the anode although the decomposition voltage is lower than that of CaCl2. Chlorine releases from the anode due to overvoltage which is caused by the formation of perovskite in a short time. Amount of chlorine is depended on the mass of TiO2 and generation of different titanium suboxides during electrolysis process. The mass ratio of TiO2 and chlorine is from 9:2 to 46:2 when titanium suboxides are between Ti3O5 and TiO at the first deoxygenantion stage. The anode is no obvious consumption during chlorine releases. Formation of the perovskite and deoxygenation of Ti2O are the main limited step to prepare titanium by electrolysis process in molten CaCl2. The total current efficency from TiO2 to Ti is 24.07%. The current efficiency of the first stage is between 22.37% and 44.74% and the second stage is between 30.18% and 37.72%.