Isothermal Kinetic Mechanism of Coke Dissolving in Hot Metal

Zhang, Wei; Hua, Fubo; Dai, Jing; Xue, Zhengliang; Ma, Guojun; Li, Chengzhi

doi:10.3390/met9040470

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…It takes a long time for coke to be renewed in the blast furnace hearth, so the accumulation of coke for a long time leads to the formation of deadman. The deadman occupies 70% of the volume of the blast furnace hearth. , The performance of hearth coke directly determines the hearth activity, production capacity, and longevity potential of the blast furnace. − Therefore, it is necessary to study the performance of the hearth coke, particularly its graphitization degree and consumption pathway. The degree of coke graphitization and consumption pathway are influenced by the target annealing time and temperature, which can reflect the renewal time of the blast furnace.…”

Section: Introductionmentioning

confidence: 99%

Graphitization and Performance of Deadman Coke in a Large Dissected Blast Furnace

et al. 2021

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The graphitization and performance of deadman coke in the blast furnace hearth have an essential influence on the longevity of the blast furnace. In this paper, coke samples were obtained from various heights in a hearth during the overhaul of the blast furnace. The voidage, particle size, graphitization degree, microstructure, and structure evolution of multiple cokes were analyzed through digital image processing, XRD, Raman spectra, scanning electron microscopy, and energy-dispersive X-ray spectroscopy (SEM-EDS). The graphitization results were compared with feed coke, tuyere coke, cohesive zone coke, and deadman coke in reference, and the main findings were analyzed. The following results were obtained. First, the voidage of deadman coke increased and then decreased with the increase of the depth while the particle size continued to decrease. In addition, the consumption rate of coke as a carburizer, reductant, and heart source was 8.47, 30.95, and 60.58%, respectively. Second, the graphitization degree of deadman coke was extremely high and showed a trend of first increasing and then decreasing. Finally, the evolution mechanism of coke graphitization was proposed. Molten iron, alkali metal, temperature, and mineral were the crucial factors that affect the graphitization of coke. The turning point of the graphitization degree was related to the buoyancy of the hearth.

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Section: Introductionmentioning

confidence: 99%

Graphitization and Performance of Deadman Coke in a Large Dissected Blast Furnace

et al. 2021

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Characteristics of CaS distribution and formation mechanism in blast furnace hearth

Zhao,

Zong,

Zhang

et al. 2024

Fuel

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Comparative Analysis on the Corrosion Resistance to Molten Iron of Four Kinds of Carbon Bricks Used in Blast Furnace Hearth

Wang

Zhang

Chen

et al. 2022

Metals

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The corrosion resistance to molten iron of four kinds of carbon bricks used in blast furnace hearth were investigated to elaborate the corrosion mechanism through the macroscopic and microscopic analysis of carbon bricks before and after reaction and thermodynamic analysis. The macroscopic analysis showed that brick A had the lowest degree of corrosion and highest uniformity at different heights, attributing to its moderate carbon content of 76.15%, main phases of C, Al2O3, SiC, and Al6Si2O13 (mullite), and lower resistance to molten iron infiltration, etc. The microscopic analysis showed that all the carbon bricks had more and larger pores than the original carbon bricks. The phenomena of the iron beads adhering to carbon brick and iron infiltration were observed between the interface of carbon brick and molten iron. In addition, the obvious corrosion process was presented that the carbon matrix was broken and peeled off during the iron infiltration process. For the carbon brick being corroded, the dissolution of carbon was the predominant reaction. The higher the carbon solubility of the molten iron, the easier the corrosion on the carbon brick. Al2O3 and SiC enhanced the corrosion resistance to molten iron of carbon bricks, and SiO2 could react with carbon to form pores as channels for the penetration of molten iron and increase the corrosion on carbon bricks. A higher graphitization degree of carbon bricks was beneficial to lessen their corrosion degree. The corrosion on carbon bricks by molten iron could be attributed to three aspects: carburization, infiltration, and scouring of molten iron. The carburization process of molten iron was the main reaction process. The molten iron infiltration into the carbon bricks facilitated the dissolution of carbon and destroyed the structure and accelerated the corrosion of the carbon bricks. The scouring of molten iron subjected the iron–carbon interface to interaction forces, promoting the separation of the exfoliated fragmented carbon brick from the iron–carbon interface to facilitate a new round of corrosion process.

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Isothermal Kinetic Mechanism of Coke Dissolving in Hot Metal

Cited by 4 publications

References 21 publications

Graphitization and Performance of Deadman Coke in a Large Dissected Blast Furnace

Graphitization and Performance of Deadman Coke in a Large Dissected Blast Furnace

Characteristics of CaS distribution and formation mechanism in blast furnace hearth

Comparative Analysis on the Corrosion Resistance to Molten Iron of Four Kinds of Carbon Bricks Used in Blast Furnace Hearth

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