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胡蒙均,马通祥,高雷章,屈正峰,温良英,胡丽文,扈玫珑.电解TiO2中间相的形成与溢出气体间的关系[J].稀有金属材料与工程(英文),2019,48(6):1847~1851.[humengjun,matongxiang,gaoleizhang,quzhengfeng,wenliangying,huliwen and humeilong.Relationship between interphases formed and gases released during electrolysis of TiO2[J].Rare Metal Materials and Engineering,2019,48(6):1847~1851.]
Relationship between interphases formed and gases released during electrolysis of TiO2
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Received:December 04, 2017  Revised:December 25, 2017
DOI:
Key words: molten-salt electrolysis  perovskite  Anodic gas
Foundation item:国家自然科学基金面上项目(项目号51674054)
Author NameAffiliation
humengjun,matongxiang,gaoleizhang,quzhengfeng,wenliangying,huliwen and humeilong  
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Abstract:
      it is well know that CaTiO3 is the evitable interphase produced during electrolysis of TiO2 in molten CaCl2. Here, the relationship between formation of CaTiO3 and deoxygenation of TiO2 and emition of gas on the anode is studied by the intermittent experiments. The results show that the process of deoxygenation from TiO2 to Ti can be dividied three stages. The first stage is deoxygenantion of TiO2 and formation of CaTiO3. The second is deoxyenation and decalcification of CaTiO3 to Ti2O including deoxygenation of titanium suboxides. The final stage is deoxygenation from Ti2O to Ti (2% O). the mole ratio of O2- and Ca2+ and CaTiO3 is 1:1:1. Cl2 releases from the anode when CaTiO3 is formed in the cathode. If the whole electrolysis time from TiO2 to Ti (2% O) is thought 100%, the cost time of stage I, stage II and stage III is 5.6%,38.9%, 55.5% respectively. Formation of CaTiO3 and deoxygenation of Ti2O to Ti are both main factors of the low current effeciency.