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Rare Metals

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Sulfur distribution in preparation of high titanium ferroalloy by thermite method with different CaO additions

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

Abstract

Ferrotitanium is used as a deoxidizer and alloying agent during steelmaking process, which has a high demand for sulfur control. Sulfur was introduced from raw materials in the process of producing ferrotitanium by thermite method, where CaO was used as fluxing agent. At the same time, CaO has a great desulfurization capability. Effects of CaO addition on the distribution of sulfur in high titanium ferroalloy prepared by thermite method were studied in this work. The equilibrium diagram of Ti–Al–Fe–S system was calculated by FactSage 6.4 software package with FactPS and FTmisc database. The alloy and slag samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma atomic emission spectrometer (ICP-AES), X-ray fluorescence (XRF) and high-frequency infrared ray carbon sulfur analyzer. The result indicates that the sulfur in the alloy firstly exists in the form of liquid FeS, thereafter TiS (s) and eventually Ti2S (s) during cooling. The sulfur is mainly distributed in the alloy, and only a small amount of sulfur remains in the slag. Moreover, it is noted that the sulfur in the alloy does not distribute homogeneously, and it exists in the form of solid solution phase, (Ti, Al, Fe)S. S content in the slag, the sulfur capacity of the slag and the sulfur distribution ratio (LS) all increase with the increment of CaO addition, while S content in alloys decreases.

Keywords

Desulfurization Sulfur partition ratio Optical basicity High titanium ferroalloy Thermite method 

Notes

Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51422403 and 51504064), the Fundamental Research Funds for the Central Universities (No. N162505002) and the National Basic Research Program of China (No. 2013CB632606).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of MetallurgyNortheastern UniversityShenyangChina
  2. 2.Key Laboratory of Ecological Utilization of Multi-Metal Intergrown Ores of Ministry of Education, Northeastern UniversityShenyangChina

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