Wetting and spreading behavior of molten iron in contact with graphite substrate: Interfacial effects

Zhu, Hao-bin; Wenlong, Zhan; Yu, Ying-chang; Pang, Qing-hai; Zhang, Junhong

doi:10.1016/j.fuproc.2020.106389

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…At present, research on the wetting behavior of carbonaceous materials and molten iron predominantly focuses on the interaction between molten iron and graphite, coke, charcoal, and synthetic materials. [7][8][9] For instance, Nguyen et al [10] investigated the changes and reactions in interfacial wettability between molten iron with varying carbon content and high-purity graphite substrate. Cham et al [11,12] examined the interfacial reactions between graphite, coke with different mineral content, and molten iron.…”

Section: Introductionmentioning

confidence: 99%

Wettability Characteristics of Nanoporous Carbon Bricks Incorporated with Al₂O₃ Phase and Molten Iron in Sustainable and Low‐Carbon Blast Furnace

Liu,

Guo,

Wang

et al. 2024

steel research int.

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Analyzing the wetting behavior between carbon brick and molten iron in a blast furnace is crucial for understanding prolonging the furnace's lifespan. This study investigates the wetting behavior between microporous carbon brick and molten iron. The contact angle between the carbon brick and molten iron is measured at various temperatures and carbon saturation conditions, while the microscopic morphology of the reacted interface is examined. Furthermore, the wetting mechanism of molten iron on the carbon brick surface is elucidated. The findings reveal that both the microporous carbon brick and molten iron remain in a never‐wetting state within the furnace. As the temperature rises from 1150 to 1450 °C, the contact angle decreases from 138° to 128°, whereas the initial carbon content in the molten iron increases from 2.6 wt% to 4.1 wt%. Additionally, the initial contact angles gradually increase from 128.3° to 133.6°, with final equilibrium contact angles of 119.2° to 127.0°, indicating a nonwetting state. The carbon dissolution reaction occurs within the carbon matrix region of the microporous carbon brick prior to carbon saturation in the molten iron. Conversely, the presence of a ceramic phase in the ceramic area hampers both chemical erosion and physical penetration of the molten iron.

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Section: Introductionmentioning

confidence: 99%

Wettability Characteristics of Nanoporous Carbon Bricks Incorporated with Al₂O₃ Phase and Molten Iron in Sustainable and Low‐Carbon Blast Furnace

Liu,

Guo,

Wang

et al. 2024

steel research int.

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show abstract

“…This necessitates the urgent requirement for low-carbon BF operation; however, pulverized coal or other substitute fuels cannot replace coke's mechanical role in providing the permeability to the upward owing gases in the BF [2][3][4][5]. The low-carbon BF operation may result in the thinning of the coke layer, which causes the instability of burden mixing, reduction in furnace permeability, gas channeling, and a delay in the reduction reaction, all of which considerably impact the smooth BF operation [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Interfacial phenomenon and Marangoni convection of Fe–C melt on coke substrate under in situ observation

GAO

Huang

Wenlong

et al. 2023

Preprint

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The interfacial phenomenon between liqiuid iron and coke is important for determining the melting efficiency in the blast furnace iron-making process. In this study, the interaction observed in the case of the iron-carbon (Fe–C) melt on coke substrate was investigated using a high-temperature vacuum wettability test equipment. The Fe–C melt did not wet and spread on the coke substrate with different graphitization degrees (r0) at a high temperature of 1450℃. The contact angles changed from 124.5° to 105.3°, and the r0 increased from 9.30 to 50.00, thus indicating a nonwetting state. The deepening of graphitization decreased the contact angle. Thereby, increasing the contact area between liquid iron and the carbonaceous material, which facilitated carbon dissolution. The irregular movements of Fe–C melt were observed in situ during the wetting process. The horizontal force of the droplet caused by interfacial tension and the contact angle; the Marangoni convection owing to the gradient of carbon concentration; and the impulse force caused by the generation, aggregation, and release of SiO bubbles at the interface were attributed to the driving force.

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“…This necessitates the urgent requirement for low-carbon BF operation; however, pulverized coal or other substitute fuels cannot replace coke’s mechanical role in providing the permeability to the upward flowing gases in the BF 2 – 5 . The low-carbon BF operation may result in the thinning of the coke layer, which causes the instability of burden mixing, reduction in furnace permeability, gas channeling, and a delay in the reduction reaction, all of which considerably impact the smooth BF operation 6 – 10 . Furthermore, the coke layer thinning weakens the solid–liquid carburization process when liquid iron passes via the coke, which lowers the carbon concentration in hot metal and deepens the corrosion of the unsaturated liquid iron to the hearth refractory 11 – 15 .…”

Section: Introductionmentioning

confidence: 99%

Interfacial phenomenon and Marangoni convection of Fe–C melt on coke substrate under in situ observation

Gao,

Huang,

Zhan

et al. 2023

Sci Rep

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The interfacial phenomenon between liqiuid iron and coke is important for determining the melting efficiency in the blast furnace iron-making process. In this study, the interaction observed in the case of the iron-carbon (Fe–C) melt on coke substrate was investigated using a high-temperature vacuum wettability test equipment. The Fe–C melt did not wet and spread on the coke substrate with different graphitization degrees (r0) at a high temperature of 1450 °C. The contact angles changed from 124.5° to 105.3°, and the r0 increased from 9.30 to 50.00%, thus indicating a nonwetting state. The deepening of graphitization decreased the contact angle. Thereby, increasing the contact area between liquid iron and the carbonaceous material, which facilitated carbon dissolution. The irregular movements of Fe–C melt were observed in situ during the wetting process. The horizontal force of the droplet caused by interfacial tension and the contact angle; the Marangoni convection owing to the gradient of carbon concentration; and the impulse force caused by the generation, aggregation, and release of SiO bubbles at the interface were attributed to the driving force.

show abstract

Wetting and spreading behavior of molten iron in contact with graphite substrate: Interfacial effects

Cited by 7 publications

References 20 publications

Wettability Characteristics of Nanoporous Carbon Bricks Incorporated with Al₂O₃ Phase and Molten Iron in Sustainable and Low‐Carbon Blast Furnace

Wettability Characteristics of Nanoporous Carbon Bricks Incorporated with Al₂O₃ Phase and Molten Iron in Sustainable and Low‐Carbon Blast Furnace

Interfacial phenomenon and Marangoni convection of Fe–C melt on coke substrate under in situ observation

Interfacial phenomenon and Marangoni convection of Fe–C melt on coke substrate under in situ observation

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Wetting and spreading behavior of molten iron in contact with graphite substrate: Interfacial effects

Cited by 7 publications

References 20 publications

Wettability Characteristics of Nanoporous Carbon Bricks Incorporated with Al2O3 Phase and Molten Iron in Sustainable and Low‐Carbon Blast Furnace

Wettability Characteristics of Nanoporous Carbon Bricks Incorporated with Al2O3 Phase and Molten Iron in Sustainable and Low‐Carbon Blast Furnace

Interfacial phenomenon and Marangoni convection of Fe–C melt on coke substrate under in situ observation

Interfacial phenomenon and Marangoni convection of Fe–C melt on coke substrate under in situ observation

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Product

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Wettability Characteristics of Nanoporous Carbon Bricks Incorporated with Al₂O₃ Phase and Molten Iron in Sustainable and Low‐Carbon Blast Furnace

Wettability Characteristics of Nanoporous Carbon Bricks Incorporated with Al₂O₃ Phase and Molten Iron in Sustainable and Low‐Carbon Blast Furnace