Coke Microstructure and Graphitization Across the Hearth Deadman Regions in a Commercial Blast Furnace

Fan, Xiaoyue; Jiao, Kexin; Zhang, Jianliang; Hongxiu, Ma; Jiang, Haibin; Yan, Biao

doi:10.2355/isijinternational.isijint-2019-004

Cited by 14 publications

(5 citation statements)

References 20 publications

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“…The graphitization is crucial to the mechanical stability and the generation of coke fines. Graphitization promoted coke cracks via the slide of graphitic planes [17] and generated coke fines, which decreased the coke mechanical stability. The 002 carbon diffraction peak intensity of BF coke was higher than that of feed coke as seen in Figure 7.…”

Section: The Graphitization Of Bf Cokementioning

confidence: 99%

“…Results showed that the effect of temperature on tumbling strength was the most notable [5,6]. At the same time, the coke properties such as the mineral composition [7][8][9][10][11][12][13][14] and graphitization [15][16][17][18] were affected by its surrounding environment. In the deadman zone, Niu and Li et al [12,13] prompted that the minerals in cokes were mainly made up of akermanite (Ca 2 MgSi 2 O 7 ), gehlenite (Ca 2 Al 2-SiO 7 ), hardystonite (Ca 2 ZnSi 2 O 7 ) and kaliophilite (KAlSiO 4 ).…”

Section: Introductionmentioning

confidence: 98%

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Microstructure analysis and mineral phase transformation of coke in blast furnace

Xie

Zeng

et al. 2022

Ironmaking & Steelmaking

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In order to reveal the actual reaction behaviour and degradation mechanism of coke, chemical composition, mineral phase transformation and microstructure of coke at different locations in blast furnace were characterized. Meanwhile, the wear and compressive resistance, as well as the secondary thermal characteristic, were carried out. Results indicated that the mineral species and contents of cokes were significantly affected by alkali metal minerals adhesion and molten slagiron corrosion. The alkali minerals and iron minerals adsorbed on the pore walls contributed to catalytic degradation of the bosh coke and tuyere coke respectively. In the upper zone of BF, the wear and compressive resistance of coke first decreased and then increased. The secondary thermal performance of BF coke was inverse with the content of alkali metal. The macropore structure of the hearth coke with the maximum graphitization disappeared to be replaced by slag and iron.

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Section: The Graphitization Of Bf Cokementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Microstructure analysis and mineral phase transformation of coke in blast furnace

Xie

Zeng

et al. 2022

Ironmaking & Steelmaking

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“…The calculation needs to meet the following assumptions, based on the blast furnace temperature field simulation and blast furnace hearth dissection [20][21][22][23][24][25][26][27][28][29].…”

Section: Force Model Of the Deadmanmentioning

confidence: 99%

Research on low-carbon smelting technology of blast furnace – optimized design of blast furnace

Zhang

Jiao

et al. 2021

Ironmaking & Steelmaking

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The optimized blast furnace design is the prerequisite for low-carbon smelting. The salamander depth and bosh angle are the key parameters, which determine the blast furnace longevity. In this paper, the physical and mathematical force model of deadman and cooling stave was established. The relationship between operating parameters and the salamander depth, as well as bosh angle, was analysed, and the gas flow scouring curve was proposed. The following results were obtained: first, the reasonable salamander depth/hearth diameter ratio and bosh angle should be 23∼25% and 73°∼75°in China, respectively. Second, the key factors that influence the floatation of deadman and wear of the cooling stave are the deadman voidage and the slag crust thickness, respectively. Lastly, it is necessary to adjust some measures such as coke ratio, blow velocity and tuyere length. This paper is meant for optimizing the design of blast furnace.

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“…Coke is a porous carbonaceous material in which the amorphous carbon structure gradually transforms to the regularly arranged graphite structure at high temperatures [23][24][25]. This study investigates the change in r 0 of coke at 1200°C, 1400°C, and 1600°C using X-ray diffraction (XRD).…”

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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Coke Microstructure and Graphitization Across the Hearth Deadman Regions in a Commercial Blast Furnace

Cited by 14 publications

References 20 publications

Microstructure analysis and mineral phase transformation of coke in blast furnace

Microstructure analysis and mineral phase transformation of coke in blast furnace

Research on low-carbon smelting technology of blast furnace – optimized design of blast furnace

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

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