Preparation of Ferrotitanium from Ilmenite by Electrolysis-Assisted Calciothermic Reduction in CaCl2-NaCl Molten Salt
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- 作者：Zhongren Zhou ; Yixin Hua ; Cunying Xu ; Jian Li ; Yan Li ; Kai Gong ; Juanjian Ru…
- 刊名：JOM Journal of the Minerals, Metals and Materials Society
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：68
- 期：2
- 页码：532-539
- 全文大小：1,367 KB
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Yixin Hua (1) (2)
Cunying Xu (1) (2)
Jian Li (1) (2)
Yan Li (1) (2)
Kai Gong (1) (2)
Juanjian Ru (1) (2)
Li Xiong (1) (2)
1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, People’s Republic of China
2. State Key Lab of Complex Nonferrous Metal Resources Clean Utilization, Kunming, 650093, People’s Republic of China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Metallic Materials
Nanotechnology
Crystallography - 出版者：Springer Boston
- ISSN：1543-1851
文摘
Electrolysis-assisted calciothermic reduction method is proposed and successfully used to prepare ferrotitanium alloy from ilmenite by using equal-molar CaCl2-NaCl molten salt as electrolyte, molybdenum rod as cathode, and graphite as anode at 973 K with cell voltages of 3.2–4.4 V under inert atmosphere. Thermodynamics analysis of the process is presented, and the products obtained are examined with x-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy. It is demonstrated that the calciothermic reduction of ilmenite is a stepwise process since intermediate CaTiO3 is observed in the products partially reduced. In the calciothermic reduction process, the reduction of FeTiO3 first gives rise to the formation of Fe and CaTiO3, which as intermediates will further react with calcium metal to form ferrotitanium alloys. This is in good agreement with the prediction of thermodynamics. Experimental results also show that increasing cell voltage can accelerate the formation of calcium metal through electrolysis of CaO and CaCl2 and, hence, promote the calciothermic reduction of ilmenite. As the electrolytic zone and reduction zone are combined in the same bath, the theoretical energy requirement for the production of FeTi in the calciothermic process is lower than that in the aluminothermic process.