Formation mechanism of the protective layer in a blast furnace hearth

Jiao, Kexin; Zhang, Jianliang; Liu, Zhengjian; Xu, Meng; Liu, Feng

doi:10.1007/s12613-015-1163-2

Cited by 53 publications

(38 citation statements)

References 12 publications

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“…A number of studies have investigated the hearth erosion of the BF, but the information on the composition and the microstructure of lumped skull lining material are still very limited. [7][8][9][10][11][12][13][14][15][16] An improved understanding of the skull formation and the wear…”

Section: Introductionmentioning

confidence: 99%

Analysis of Blast Furnace Hearth Sidewall Erosion and Protective Layer Formation

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Analysis of Blast Furnace Hearth Sidewall Erosion and Protective Layer Formation

et al. 2016

Self Cite

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“…26,27) It is difficult for blast furnace slag to dip below the taphole level directly because the considerable variation of density exists between the hot metal and liquid slag. However, blast furnace slag can enter the salamander indirectly.…”

Section: The Source Of Blast Furnace Slag Phase In Thementioning

confidence: 99%

“…On the other hand, the blast furnace slag existing in salamander provides the material for the formation of the skull (a layer of solidified iron and slag, and graphite) on the hot surface of the refractory linings below the taphole level, protecting blast furnace linings from erosion. Some researchers 27) found that the protective layers sampled 1 m below the taphole level contain the slag phases whose major crystalline phase is magnesium melilite (Ca 2 MgSi 2 O 7 ). Our results show that the magnesium melilite is one of the main phases in the deadman coke below the taphole level.…”

Section: The Effect Of Mineral Phases In Deadman Cokementioning

confidence: 99%

Changes in Microstructure and Chemical Composition of Deadman Coke of a 2800 m<sup>3</sup> Industrial Blast Furnace

Niu

Cheng

et al. 2018

ISIJ Int.

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The paper examined the changes in microstructure and inorganic elements in their true mineral forms of the coke samples from various hearth locations using X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) after the blow out and cool down of a 2 800 m 3 industrial blast furnace. The results illustrate that all deadman coke samples from fines to lumps were confirmed to be highly graphitized. Furthermore, the deadman coke was filled up with the accumulated KAlSiO 4 during its descent process and the blast furnace slag which consisted of Ca 2 MgSi 2 O 7 -Ca 2 Al 2 SiO 7 system and Ca 2 ZnSi 2 O 7 phases. Besides the slag phases, the iron was also observed in the deadman coke soaked in the iron layer. Those cause that the mass of the deadman coke is about 1.62-2.82 times larger than that of the feed coke under the same conditions. Thus it may make the deadman which was designed to float sit on the hearth bottom as the permeation of the slag and the liquid iron into the deadman coke was not taken into consideration during the design process. We concluded that the slag phase below the taphole level is primarily derived from the blast furnace slag. Moreover, the deadman coke carrying final slag may come in contact with the hearth bottom and react with ceramic pad or carbon brick with a sitting deadman, thereby it results in degrading the hearth lining. Meanwhile, the slag phases below the taphole level can provide the material for the formation of skull to protect the hearth lining.

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“…However, the thermal conductivity of corundum brick was much less than that of the other two kinds of bricks. The increased thermal conductivity of blast furnace hearth refractories can make full use of cooling system, acting to decrease the hot face temperature of hearth refractories [23].…”

Section: Phase Composition and Thermal Conductivitymentioning

confidence: 99%

Oxidation behavior and kinetics of Al 2 O 3 -SiC-SiO 2 -C refractories in CO 2 atmosphere

Zuo

Wang

2016

Ceramics International

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Formation mechanism of the protective layer in a blast furnace hearth

Cited by 53 publications

References 12 publications

Analysis of Blast Furnace Hearth Sidewall Erosion and Protective Layer Formation

Analysis of Blast Furnace Hearth Sidewall Erosion and Protective Layer Formation

Changes in Microstructure and Chemical Composition of Deadman Coke of a 2800 m<sup>3</sup> Industrial Blast Furnace

Oxidation behavior and kinetics of Al 2 O 3 -SiC-SiO 2 -C refractories in CO 2 atmosphere

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