Effect of particle size composition of iron ore fines on the suitable amount of bonding phase in sintering process

Fan Xinsheng; Du Yu; Guo Xingmin

doi:10.7513/j.issn.1004-7638.2023.06.017

Volume 44 Issue 6

Dec. 2023

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Fan Xinsheng, Du Yu, Guo Xingmin. Effect of particle size composition of iron ore fines on the suitable amount of bonding phase in sintering process[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 117-125. doi: 10.7513/j.issn.1004-7638.2023.06.017

Citation:

Fan Xinsheng, Du Yu, Guo Xingmin. Effect of particle size composition of iron ore fines on the suitable amount of bonding phase in sintering process[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 117-125. doi: 10.7513/j.issn.1004-7638.2023.06.017

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Effect of particle size composition of iron ore fines on the suitable amount of bonding phase in sintering process

doi: 10.7513/j.issn.1004-7638.2023.06.017

Fan Xinsheng^{1, 2
,},
Du Yu^{1, 2},
Guo Xingmin^{1, 2
,
,}

1.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2023-02-01
Available Online: 2024-01-11
Publish Date: 2023-12-30

Abstract

Abstract

Calcium ferrite is main bonding phase in high-basicity sinter, its formation is closely related to the sinter quality, and the appropriate amount of bonding phase is also an important factor of energy saving and carbon reduction in the sintering process. In this work, mono-calcium ferrite (CF) as an initial bonding phase and pre-sintered hematite (Fe₂O₃) powder as iron ore fines were used to investigate the influence of particle size composition of iron ore fines on the appropriate amount of bonding phase in sintering process. The results show that the amount of bonding phase needed for obtaining the same compressive strength of sintered samples increases with the increase of iron ore fines size. At same particle size range of iron ore fines, the compressive strength increases first and then decreases with increase of CF addition, and its maximum value should be corresponding to the suitable amount of bonding phase. At different particle size range, the maximum compressive strength decreases with increase of iron ore fines size, simultaneous the suitable amount of bonding phase shiftes to the direction of increasing bonding phase amount. Besides, CF reacts with Fe₂O₃ to form a calcium rich-ferrate (Ca_3.6Fe_14.4O_25.2) with the low melting point, increasing the amount of bonding phase in sintering process. The Ca_3.6Fe_14.4O_25.2 formation as a new phase increases with the increase of CF addition and the decrease of iron ore fines size, which revealed the relationship of amount between actual bonding phase and initial one in sintering process.
- sinter,
- iron ore fines,
- particle size,
- bonding phase,
- CF,
- compression strength

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References(31)

References

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