Migration Behavior of the MgO and its Influence on the Reduction of Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;–MgO Sinter

Pan, Feng; Zhu, Qingshan; Du, Zhan; Sun, Haoyan

doi:10.2355/isijinternational.isijint-2017-566

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…7,19,20 Yang et al 21 reported that the addition of MgO restrained the formation of CaO•Fe 2 O 3 leading to the decrease in the amount of the SFCA (silico-ferrite of calcium and aluminum) bonding phase during the sintering process. Pan et al 22 reported that a low MgO content can effectively improve the reduction rate of sinter. Low-MgO addition not only improves the softening-melting characteristics of the sinter 12,23−25 but also reduces the fuel rate, sintering rate, reducibility, and sinter strength as well as increase the initial melt-down temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Fine MgO-Bearing Flux on the Strength of Sinter before and after Low-Temperature Reduction

Shen

Jiang

et al. 2022

ACS Omega

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Decreasing the MgO content can improve most of the metallurgical properties of sinter, but the low-temperature reduction disintegration index (RDI) property will be worse. In order to improve the RDI property of sinter under certain MgO contents, the effects of fine MgO-bearing flux on the strength of sintered samples before and after reduction in three systems (Fe 2 O 3 -MgO, Fe 2 O 3 -MgO-CaO, and Fe 2 O 3 -MgO-CaO-SiO 2 ) were investigated in the present work. The experimental results show that (1) in the three systems, the percentage of fine light calcined magnesite (LCM) increases from 0 to 100%, and the compression strength of the samples before reduction increases from 0.140 to 0.187 MPa, from 0.115 to 0.175 MPa, and from 0.121 to 0.164 MPa, respectively. The compression strength of the samples after reduction increases from 0.062 to 0.151 MPa, from 0.100 to 0.156 MPa, and from 0.099 to 0.151 MPa, respectively. (2) The fundamental reason is that the fine powders can increase the specific surface area and the surface energy of the interface. It is beneficial to promoting the mineralization of MgO-bearing flux. More formation of MgO•Fe 2 O 3 may increase the strength of samples before reduction. Less transformation from Fe 2 O 3 to Fe 3 O 4 may increase the strength of samples after reduction. The microstructures of samples are more compact and uniform. Therefore, fine LCM can improve the strength of sinter before and after reduction. The outcomes of the present work can improve the sintering quality by using the fine MgO-bearing flux in the sintering process.

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Section: Introductionmentioning

confidence: 99%

“…reported that the addition of MgO restrained the formation of CaO·Fe 2 O 3 leading to the decrease in the amount of the SFCA (silico-ferrite of calcium and aluminum) bonding phase during the sintering process. Pan et al . reported that a low MgO content can effectively improve the reduction rate of sinter.…”

Section: Introductionmentioning

confidence: 99%

Effects of Fine MgO-Bearing Flux on the Strength of Sinter before and after Low-Temperature Reduction

Shen

Jiang

et al. 2022

ACS Omega

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“…The influence of MgO on sinter and pellet has been studied for many years [17][18][19][20][21]. Large amounts preceding works demonstrated that adding MgO in pellet or sinter could enhance its high temperature properties.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Softening-Melting Behaviors and Slag Characteristics of Vanadium-Titanium Magnetite Burden with Various MgO Addition

et al. 2022

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MgO addition plays an essential role in the blast furnace smelting process, including softening-melting characteristics and metallurgical properties of slag. In the present study, the effect of MgO distribution on the softening-melting characteristics and slag system of vanadium-titanium magnetite burden were explored by simulating BF conditions. The results show that the MgO flux addition significantly affects the crystallization temperature of slag-phase, the precipitated phase components, and slag viscosity. This indicates that appropriate MgO addition can improve the metallurgical properties of blast furnace slag effectively, thereby improving the softening-melting-dripping performance of the mixed burden. The V-Ti pellets with a MgO content higher than 2.40 wt% exhibit optimum metallurgical properties. With a constant MgO content in mixed burden, the softening-melting properties of composite burden could be improved effectively as the MgO partitioning scheme includes 1.90 wt% MgO in sinter and 3.02 wt% MgO in pellet.

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“…Shen et al, Zhang et al, and other researchers [9][10][11][12][13][14][15][16][17][18] reported that increasing the MgO content in iron ore sinter could improve the reduction degradation performance. As for the mechanism, It has been some conflicting.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al [10] and Yi et al [16] considered that Mg 2+ could enter in magnetite lattice promoting the formation of magnetite or magniferous magnetite (magnesioferrite), simultaneously inhibiting the phase transition from magnetite to hematite in the cooling process. Pan et al [17] considered that Mg 2+ diffuses into magnetite, which forms pores and active sites, promoting the reaction of hematite to magnetite kinetically. Our previous work [18] confirmed that MgO improves the formation of magnesioferrite as a spinel phase, including magnetite, magnesium ferrite and magniferous magnetite in the sintering process, and found that MgO reacts with hematite to form magnesium ferrite at the initial stage, which results in decrease in the crystal nucleation energy of magnetite, promoting the formation of magnetite.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Investigation of MgO, Al2O3 and SiO2 Effects on Solid-State Formation of Secondary Hematite in Sintering Process of Iron Ore Fines

Chen

Guo

et al. 2022

Minerals

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Secondary hematite (SH) is a serious factor resulting in reduction degradation of iron ore sinter in a blast furnace; however, until now, a quantitative study for SH formation had not been reported. In this work, the effects of gangue composition, including MgO, Al2O3 and SiO2, on the solid-state formation in the sintering process of iron ore fines were investigated quantitatively. It shows that the SH formation decreased from 67.84% to 46.11%, 35.44% and 22.37% after adding 1.0%, 3.0% and 5.0% MgO, respectively, while for Al2O3, the amount increased to 69.38%, 69.98% and 70.56%, respectively. For SiO2, the amount changed to 68.14%, 61.59% and 47.96%, respectively. Simultaneously, the magnetite (magnesioferrite) formation increased from 8.24% to 34.79%, 50.26% and 70.45% after adding 1.0%, 3.0% and 5.0% MgO, respectively. For Al2O3 and SiO2, the amount changed to 8.95%, 8.37%, 7.62% and 7.62%, 11.10%, 18.77%, respectively, compared with no gangue. This indicates that the SH formation increased with decrease in magnesioferrite. It was found that the decrease in SH formation relates to the diffusion of Mg2+ in magnesioferrite, which inhibits the solid-state formation of SH kinetically. A supposition was suggested that a maghemite existed at a high temperature, and decreased with an increase in MgO addition. This would be another reason to improve the degradation performance of iron ore sinter.

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Migration Behavior of the MgO and its Influence on the Reduction of Fe<sub>3</sub>O<sub>4</sub>–MgO Sinter

Cited by 14 publications

References 25 publications

Effects of Fine MgO-Bearing Flux on the Strength of Sinter before and after Low-Temperature Reduction

Effects of Fine MgO-Bearing Flux on the Strength of Sinter before and after Low-Temperature Reduction

Revealing the Softening-Melting Behaviors and Slag Characteristics of Vanadium-Titanium Magnetite Burden with Various MgO Addition

Quantitative Investigation of MgO, Al2O3 and SiO2 Effects on Solid-State Formation of Secondary Hematite in Sintering Process of Iron Ore Fines

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