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Home > Archive>Volume 50, Issue 6, 2021 >1990-1998. DOI:10.12442/j.issn.1002-185X.20200655
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Synthesized Process of Calcium Ferrite and Effect of TiO2 and CaTiO3 in Fe2O3-CaO-TiO2 System
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1.School of Metallurgy, Northeastern University, Shenyang 110819, China;2.Liaoning Key Laboratory of Recycling Science for Metallurgical Resources, Shenyang 110819, China;3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110819, China;4.HBIS Group ChengSteel, Chengde 067102, China;5.Ansteel Beijing Research Institute, Beijing 102200, China

Fund Project:

National Natural Science Foundation of China (U1908226, 51674084, 21908020); Fundamental Research Funds for the Central Universities (N182503035)

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    Abstract:

    In order to investigate the phenomenon that the affecting mechanism of high-titanium vanadium-titanium magnetite is caused by separate TiO2 or by CaTiO3 formed from TiO2 and CaO, calcium ferrite was synthetized by pure reagents of Fe2O3 and CaO, and the effect of TiO2 and CaTiO3 on the formation mechanism of titanium calcium ferrite (FCT) was researched. Different samples were sintered at the temperatures of 1023~1423 K for different time under air atmosphere based on thermodynamics calculations with Factsage 7.0. The phase transformation and microstructure changes in sintered samples were examined through different characterization means including X-ray diffraction and scanning electron microscope-energy disperse spectroscopy. It is found that the formation process of calcium ferrite can be mainly divided into two stages. The synthesized product is Ca2Fe2O5 with the reaction “Fe2O3 (s) + 2CaO (s) = Ca2Fe2O5 (s)” between Fe2O3 and CaO at 1023~1223 K in the former stage, and the predominant product is CaFe2O4 with the reaction “Ca2Fe2O5 (s) + Fe2O3 (s) = 2CaFe2O4 (s)” between Ca2Fe2O5 and Fe2O3 at 1223~1423 K in the latter stage, in which the reaction rate is accelerated especially at 1423 K. It is observed that CaTiO3 increases with increasing the temperature. However, the solid solution of Ti element in calcium ferrite is greatly difficult to realize and the reaction between TiO2 and calcium ferrite is not an effective way to generate FCT. It is also observed that the amount of Fe element in the phase boundary of CaTiO3 and FCT increases with the extension of the thermal insulation time. FCT is predominantly formed through the solid solution of Fe component in CaTiO3, and the main reaction is “Fe2O3 (s) + CaTiO3 (s) = FCT (s)”.

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[Cheng Gongjin, Zhou Xinlei, Gao Minglei, Chang Fuzeng, Teng Aijun, Xing Zhenxing, Song Hanlin, Gao Zixian, Tang Weidong, Zhao Beibei, Wang Jinlong, Zhao Dan, Liu Chao, Li Lanjie, Yang He, Chen Donghui, Xue Xiangxin, Bai Ruiguo, Zhang Weijun. Synthesized Process of Calcium Ferrite and Effect of TiO2 and CaTiO3 in Fe2O3-CaO-TiO2 System[J]. Rare Metal Materials and Engineering,2021,50(6):1990~1998.]
DOI：10.12442/j. issn.1002-185X.20200655

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History
  • Received:September 01,2020
  • Revised:December 18,2020
  • Adopted:December 22,2020
  • Online: July 07,2021
  • Published: June 30,2021

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