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Determination method of high-temperature characteristics of iron-ore sintering based on n(Fe2O3)/n(CaO)

  • Zheng-wei Yu
  • Li-xin QianEmail author
  • Hong-ming LongEmail author
  • Yi-fan Wang
  • Qing-min Meng
  • Tie-jun Chun
Original Paper

Abstract

The high-temperature characteristics of iron ores play important roles in optimizing ore proportion of sintering, which are tested by using iron-ore fines and analytical reagent CaO as raw materials. Two calculation methods of CaO addition amount based on binary basicity (basicity method) and n(Fe2O3)/n(CaO) (mole ratio method), respectively, were employed to evaluate the liquid phase fluidity (LPF) and the capability of calcium ferrite formation (CCFF) of iron ores. The results show that the rule of LPF of iron ores under the mole ratio method is different from that with basicity method. The LPF measured by basicity method has a linear positive correlation with the SiO2 content, and there is no linear relationship between LPF and Al2O3 content or mass loss on ignition, which are inconsistent with the results of the previous study. And the results of CCFF with low SiO2 content (< 3 wt.%) or high SiO2 content (> 7 wt.%) based on basicity method cannot reflect the true CCFF. The mole ratio method could successfully solve this problem by reducing the effect of CaO addition amount changes caused by SiO2 content of iron ores.

Keywords

Iron-ore sintering High-temperature characteristics Liquid phase fluidity Calcium ferrite CaO addition amount 

Notes

Acknowledgements

This work was supported by the Key Project of National Natural Science Foundation of China (Grant No. U1660206) and the Projects of National Natural Science Foundation of China (Grant Nos. 51674002 and 51704009).

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Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  1. 1.School of Metallurgical EngineeringAnhui University of TechnologyMa’anshanChina
  2. 2.Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology)Ministry of EducationMa’anshanChina

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