Effects of Coke Ash on Erosion of Carbon Composite Brick

Deng, Yong; Jiao, Kexin; Liu, Zhengjian; Zhang, Jianliang; Song, Qingqing

doi:10.2355/isijinternational.isijint-2018-562

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…Due to the erosion of high-temperature molten iron and slag, along with molten iron circulation, the life of hearths is the emphasis of BF life research. The corrosion resistance of refractory materials is the main factor affecting the life of blast furnace hearths [6][7][8][9][10][11][12][13][14]. Thus, it is important to see the corrosion progress of refractory in blast furnace environments.…”

Section: Introductionmentioning

confidence: 99%

Study on Corrosion Resistance of S-Carbon Bricks for Blast Furnace Hearth in Molten Iron

Shi

Wang

Zong

et al. 2023

Metals

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This study simulated the corrosion reaction of S-carbon bricks in a hearth at different carbon contents, flow velocities and temperatures, and their macroscopic and microscopic morphologies were observed by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The results showed that the dissolution of elemental carbon from carbon bricks into molten iron was a rate-controlled reaction. Increasing the temperature to around 1500 °C and decreasing the carbon content to around 4.5% reduced the saturated solubility of carbon in molten iron, and the erosion degree and dissolution rate of the carbon bricks increased correspondingly. For the flow velocity, its increase promoted mechanical flushing and led to an increase in the convective heat transfer coefficient of molten iron, which would increase the hot-side temperature of the hearth sidewall, promoting carbon unsaturation in hot metal and the dissolution reaction.

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Section: Introductionmentioning

confidence: 99%

Study on Corrosion Resistance of S-Carbon Bricks for Blast Furnace Hearth in Molten Iron

Shi

Wang

Zong

et al. 2023

Metals

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Research on the Mechanism Model of Carbon Composite Material Damaged by Erosion in the Thermal Field of Single Crystal Silicon Furnace

Wang

Jianxing

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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Aiming at the problem of the short service life of the carbon/carbon pot wall caused by continuous silicification during the pulling process of single crystal silicon, the paper analyzes the failure mode of the carbon/carbon pot wall and analyzes the influence of the pot wall in the single crystal silicon furnace thermal field. The mechanism of erosion damage. It is concluded from the use situation that the carbon/carbon composite crucible can be used in the field of Czochralski single crystal silicon, and its performance is far better than that of the graphite crucible, and the destruction mechanism of the carbon/carbon composite crucible is analyzed, and solutions are proposed. Through the analysis of the entire industry, carbon/carbon composite crucibles will replace graphite crucibles and become the preferred material for the thermal field of Czochralski silicon single crystals in the future.

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Migration Behavior of K, Na, S, Ti in Hearth of a Commercial Blast Furnace

Liu

Zhang

et al. 2022

ISIJ Int.

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In-depth understanding of the existence state and migration behavior of K, Na, S, Ti in the BF hearth is essential to improve the campaign life and optimize the operation process of the blast furnace. In the study, deadman and carbon brick samples were extracted along the radial direction from a large commercial BF during dissection investigation. The microscopic morphology of the samples and the migration behavior of K, Na, S, Ti were analyzed. It was found that a layer of minerals existed on the surface of deadman coke in hearth, and high melting temperature phases such as CaS and TiN as well as slag with high aluminum were existed at the coke-slag-iron interface. K, Na compound present widespread in the deadman coke and carbon brick. The formation of mineral layer reduced the coke dissolution rate, thereby delaying the renewal rate of the deadman. With the dissolution of coke, minerals flow out from the surface of coke and precipitate as alumina and MgAl 2 O 4 spinel, which reduces the voidage of the deadman. Meanwhile, slag is sufficiently desulfurized with the iron to form a large amount of CaS accumulation at the hearth sidewall, which intensifies the iron circulation and increases the erosion of carbon brick. When the slag is in contact with the refractory, the K, Na contained in the slag provides a source of alkalis attack on the carbon bricks, and the Ti in the slag provides the possibility of forming a protective layer containing titanium on the sidewall of the hearth.

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Effects of Coke Ash on Erosion of Carbon Composite Brick

Cited by 4 publications

References 16 publications

Study on Corrosion Resistance of S-Carbon Bricks for Blast Furnace Hearth in Molten Iron

Study on Corrosion Resistance of S-Carbon Bricks for Blast Furnace Hearth in Molten Iron

Research on the Mechanism Model of Carbon Composite Material Damaged by Erosion in the Thermal Field of Single Crystal Silicon Furnace

Migration Behavior of K, Na, S, Ti in Hearth of a Commercial Blast Furnace

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