Formation mechanism of Ca3TiFe2O8 in a CaO-TiO2 -Fe2O3 system

XIANG Nan; GUO Yu-feng; GUO Xing-min

doi:10.13374/j.issn2095-9389.2017.11.009

Volume 39 Issue 11

Nov. 2017

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XIANG Nan, GUO Yu-feng, GUO Xing-min. Formation mechanism of Ca3TiFe2O8 in a CaO-TiO2 -Fe2O3 system[J]. Chinese Journal of Engineering, 2017, 39(11): 1669-1673. doi: 10.13374/j.issn2095-9389.2017.11.009

Citation:

XIANG Nan, GUO Yu-feng, GUO Xing-min. Formation mechanism of Ca₃TiFe₂O₈ in a CaO-TiO₂ -Fe₂O₃ system[J]. Chinese Journal of Engineering, 2017, 39(11): 1669-1673. doi: 10.13374/j.issn2095-9389.2017.11.009

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Formation mechanism of Ca₃TiFe₂O₈ in a CaO-TiO₂ -Fe₂O₃ system

doi: 10.13374/j.issn2095-9389.2017.11.009

XIANG Nan^1,2,
GUO Yu-feng^1,2,
GUO Xing-min^{1,2
,
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1) State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
2) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2016-12-01

Abstract

Abstract

Vanadium-titanium magnetite is one of the important raw materials for iron making in a blast furnace. Ca₃TiFe₂O₈, which is a mineral of vanadium-titanium sinter, was discovered to form during the process; however, its formation mechanism is not clear. In this work, an X-ray diffraction analysis, an elemental spectroscopy, and a TG-DSC were employed to investigate the formation mechanism of Ca₃TiFe₂O₈ and the formation law at different temperatures and at CaO and TiO₂ contents in the CaO-TiO₂ -Fe₂O₃ system. The formation mechanism of Ca₃TiFe₂O₈ is clarified:CaO reacts with Fe₂O₃ to form Ca₂ Fe₂O₅, and then continues to react with the CaTiO₃ to form Ca₃TiFe₂O₈. The longer the reaction time, the greater is the amount of Ca₃TiFe₂O₈ formed. However, the effect of temperature on the formation of Ca₃TiFe₂O₈ is not obvious. It is found that high CaO content contributes to the formation of Ca₃TiFe₂O₈. Further, so long as TiO₂ is present, Ca₃TiFe₂O₈ is formed under the condition of equal molar concentration Fe₂O₃ and CaO.
- vanadium and titanium magnetite,
- sintering,
- Ca₃TiFe₂O₈,
- formation mechanism,
- formation law

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References

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