Reduction Behaviors of Sinter Made from Magnetite Concentrates in Reducing Process Simulated COREX Shaft Furnace

Shi, Benjing; Zhu, Deqing; Pan, Jian; Xue, Yuxiao

doi:10.1007/978-3-319-51340-9_36

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…These results reveal that the reduction of sinter was apparently restrained by increasing MgO content. Previous research noted that the reduction of Fe2O3 to Fe3O4 dominates reducing reaction at 400-550 °C for sinter in reducing condition simulated COREX shaft furnace [5]. This reaction was widely recognized as the root cause for reduction degradation of sinter, because volumetric expansion up to 25% occurred after the hematite (Fe2O3) was reduced to magnetite (Fe3O4) and generated significant inner-stress around reduced area in sinter, which would break the overall structure of sinter [8,9].…”

Section: Microstructure and Mineral Compositions Of Sinter With Different Content Of Mgomentioning

confidence: 99%

“…That is the main reason for the decrease of sinter strength as Figure 2a shows. On the other hand, because the reduction of Fe 2 O 3 to Fe 3 O 4 -which causes volumetric expansion and the generates considerable inner-stress in sinter-dominates reducing reaction of sinter at such reducing condition simulated COREX shaft furnace [5], the obvious decrease in hematite quantity could undoubtedly decrease the reduction degree at low temperature of sinter. Meantime, the probable reducing inner-stress generated during reduction was also decreased.…”

Section: Microstructure and Mineral Compositions Of Sinter With Different Content Of Mgomentioning

confidence: 99%

“…This makes the COREX process less dependent on high-quality coking coal resources compared with traditional iron-making process in blast furnace (BF) [1][2][3][4]. However, the supply shortage and higher price of pellets, which brings about higher cost of hot metal by COREX process restrict its further development in China [5]. The Chinese steel mills innovatively proportioned sinter into the burden of COREX shaft furnace, on considering the surplus production capacity and relative lower fabricating cost of sinter [6].…”

Section: Introductionmentioning

confidence: 99%

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Influence of MgO on Low Temperature Reduction and Mineralogical Changes of Sinter in Simulated COREX Shaft Furnace Reducing Conditions

et al. 2019

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COREX (Coal-Reduction-Extreme) smelting reduction process provides a sustainable developing way for ironmaking industry, but the sources of iron ore materials restrict its development in China. Meanwhile, the application of sinter, which is marked by low manufacture cost and overcapacity in China, to COREX furnace faced proportion limitation due to its worse low temperature reduction degradation performance. This work explored the influence of MgO content on the low-temperature (550 °C) reduction of sinter in reducing conditions simulating COREX shaft furnace. The mineralogical change of sinter containing different content of MgO before and after reduction was analyzed by X-ray diffraction (XRD), optical microscopy, and scanning electron microscopy for revealing the action mechanism of MgO on the low-temperature-reduction of sinter. The results show that increasing MgO (1.36–3.10%) improved the low temperature reduction degradation performance of sinter, and decreased its reduction degree and reduction rate at low temperature. More MgO the sinter contained, less Fe2O3 and SFCA was observed in sinter. Meantime, less Fe2O3 was reduced and the generation of innerstress was restrained during reduction process. The improved RDI (reduction degradation index) in COREX process of sinter by increasing MgO content is a comprehensive result of lowering strength and inhibiting probable reduction of sinter.

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Section: Microstructure and Mineral Compositions Of Sinter With Different Content Of Mgomentioning

confidence: 99%

Section: Microstructure and Mineral Compositions Of Sinter With Different Content Of Mgomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of MgO on Low Temperature Reduction and Mineralogical Changes of Sinter in Simulated COREX Shaft Furnace Reducing Conditions

et al. 2019

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“…However, with the increase of sinter proportion in the composite burden, exceptions of gas distribution and even hanging occurred in the shaft furnace. Then the sinter proportion was limited to under 25% [8,9]. In view of the influence of the burden profile on the gas-solid distribution in the COREX shaft furnace, the abnormal phenomena were attributed to the worse low-temperature reduction deg-radation of sinter compared to pellet [10,11].…”

Section: Introductionmentioning

confidence: 99%

Research on the Preparation of Sinter for COREX Reduction Process by Varying Basicity and MgO Content

Shi¹,

Zhu

Pan

et al. 2022

Minerals

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Sinter has been introduced into the composite burden of the COREX ironmaking process in China to lower the material cost, but the proportion is limited due to its poor low-temperature reduction degradation performance in the shaft furnace. This work dealt with the preparation of sinter for the COREX process by varying the MgO content and basicity. Their effects on the sintering and reduction properties under reducing condition simulating COREX shaft furnace were investigated, and the changes in the mineralogy of sinter with different MgO content and basicity were explored. The results showed that increasing MgO content affected the sinter strength and solid fuel consumption but restrained reduction degradation of sinter in the shaft furnace. In the basicity range of 0.8–2.6, the strength, RDI+6.3 and RDI+3.15 of sinter all presented a V-shaped curve and the minimum value occurred at a basicity of approximately 1.6. By comprehensive consideration, sinter with 2.35%+ MgO and 2.2+ basicity for COREX process was proposed and verified in industrial tests. Sinter with higher MgO content contained less SFCA and hematite, while glass and SFCA were dominant in the binding phase in sinter with low basicity (0.8) and high basicity (2.6) respectively and were associated with the relatively higher sinter strength. The changes in the mineralogy of sinter determined the variations of RDI of sinter with different MgO content and basicity, by affecting the sinter strength and the probable reduction of inner stress.

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Preparation of sinter with low reduction degradation index for COREX reduction in a high proportion

Pan

et al. 2022

J. Iron Steel Res. Int.

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Reduction Behaviors of Sinter Made from Magnetite Concentrates in Reducing Process Simulated COREX Shaft Furnace

Cited by 3 publications

References 11 publications

Influence of MgO on Low Temperature Reduction and Mineralogical Changes of Sinter in Simulated COREX Shaft Furnace Reducing Conditions

Influence of MgO on Low Temperature Reduction and Mineralogical Changes of Sinter in Simulated COREX Shaft Furnace Reducing Conditions

Research on the Preparation of Sinter for COREX Reduction Process by Varying Basicity and MgO Content

Preparation of sinter with low reduction degradation index for COREX reduction in a high proportion

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