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Rare Metals

, Volume 38, Issue 9, pp 892–898 | Cite as

Oxygen content of high ferrotitanium prepared by thermite method with different melt separation temperatures

  • Chu Cheng
  • Zhi-He DouEmail author
  • Ting-An Zhang
  • Jian-Ming Su
  • Hui-Jie Zhang
  • Yan Liu
  • Li-Ping Niu
Article
  • 63 Downloads

Abstract

High ferrotitanium prepared directly by the thermite method has a disadvantageously high O content (≥ 10 wt%) because of the short slag-metal separation time. In this study, CaO and CaF2 are added to the melt to improve the basicity of the slag and melt separation under heat preservation is performed to strengthen slag-metal separation. The thermodynamics of the step-by-step reduction process of TiO2 in the Ti–Al–Fe–Si–O system whose composition is close to the alloy after melt separation were calculated. Samples of alloys and slags before and after melt separation were systematically analyzed. The result indicates that the reaction that TiO is reduced by Al to Ti is the limited step in the reduction process of TiO2. The O content of the alloys slightly decreases with temperature from 1873 to 2023 K, which agrees with the changes in the law of deoxidation limit. It is mainly attributed to the movement of chemical reactions in the alloy melt at different temperatures and slag-metal interfacial reaction. The addition of Al2O3–CaO–CaF2 slag and high temperature promote the removal of Al2O3 and titanium suboxides. The minimum contents of O and Al in the alloy reach 1.84 wt% and 3.26 wt%, respectively.

Keywords

High ferrotitanium Oxygen content Melt separation Slag-metal separation Thermite method 

Notes

Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51422403, 51774078 and U1508217) and the Fundamental Research Funds for the Central Universities (No. N162505002).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of MetallurgyNortheastern UniversityShenyangChina
  2. 2.Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of EducationShenyangChina

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