Phase Composition and Properties Distribution of Residual Iron in a Dissected Blast Furnace Hearth

Zhang, Lei; Zhang, Jianliang; Jiao, Kexin; Wang, Cui

doi:10.2355/isijinternational.isijint-2019-712

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…Zhang et al 21) analyzed the phase composition of the residual iron in the hearth and found that the residual iron near the carbon brick side contains phases such as Ti 3 N 2 , KAlSi 2 O 6 , and Al 2 O 3 . These studies are important to understand the state of trace elements in the hearth.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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Deadman Behavior and Slag–Iron–Coke Interaction of Low Carbon and Safety Blast Furnace: A Review

Zong,

Guo,

Zhang

et al. 2024

steel research int.

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The elucidation of the deadman's behavior and the interaction between slag–iron–coke within the blast furnace hearth are essential for the realization of low‐carbon and safe production. In this review, the macrostate of the deadman, the interactions between slag–iron–coke, carburizing behaviors, and renewal mechanisms are comprehensively examined. First, the formation and state of the deadman, voidage, and the distribution of coke sizes within the blast furnace hearth are characterized. The average coke particle size ranges from 20 to 30 mm, and the deadman void fraction of 30–50%. Second, the interaction between slag–iron–coke as well as the occurrence state of the mineral layer at the interface within the deadman is elucidated. The ash composition and content of coke are the key factors affecting the slag–iron–coke interaction and interface phase composition. Third, the influence exerted by critical factors such as the physical properties of the carbon source, molten iron, and temperature on the carburizing behavior are analyzed, with the renewal mechanisms of the deadman also being disclosed. Finally, three future focal areas are proposed: characterization and intelligent monitoring of deadman permeability, analysis of slag–iron–coke properties and interface mineral layers control, and in‐depth analysis of deadman renewal and carbon carburization in molten iron. It is anticipated that the studies will enhance the comprehension of deadman behavior and the interactions between slag–iron–coke, thereby fostering the blast furnace's sustainable development.

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Influence of the Residual Iron on the Erosion of Carbon Bricks in a 4000 m3 Blast Furnace Hearth: From the Measured Properties to the Proposed Mechanisms

Wang

Liao

et al. 2022

Metall Mater Trans B

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Phase Composition and Properties Distribution of Residual Iron in a Dissected Blast Furnace Hearth

Cited by 5 publications

References 17 publications

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

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

Deadman Behavior and Slag–Iron–Coke Interaction of Low Carbon and Safety Blast Furnace: A Review

Influence of the Residual Iron on the Erosion of Carbon Bricks in a 4000 m3 Blast Furnace Hearth: From the Measured Properties to the Proposed Mechanisms

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