Effect of reaction conditions on coke tumbling strength, carbon structure and mineralogy

Shen, Fenglei; Gupta, Sushil K.; Liu, Yang; Meng, Qingbo; French, David; Sahajwalla, Veena

doi:10.1016/j.fuel.2013.04.059

Cited by 25 publications

(5 citation statements)

References 11 publications

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“…At 1100 °C, the solution loss region was the largest and increased in local porosity, which was relatively homogeneous, whereas in the coke outer-surface region, the solution loss region and degradation region occurred at 1300 °C. Still, variability at 1150 °C for CO 2 concentration and local porosity within the coke led to the highest coke degradation and the lowest coke strength after reaction. − The literature also reported that the sensitivity of the coke CRI and CSR determined from the quality control laboratories should be adequate because it depends on several operating parameters like heating rate, bulk density, moisture content, temperature, etc. ,− Also, many researchers have developed a prediction model based on various factors that can give insight into coke quality based on data mining techniques. − Therefore, in this study, the authors have conducted detailed research on factors affecting variability in coke reactivity test under the standard test condition for laboratory and commercial coke samples produced from stamp charge batteries using a specially designed sample holder probe. The study of inter-laboratory comparison test (ILCT) on CSR and CRI at different laboratories is also part of the present research.…”

Section: Introductionmentioning

confidence: 93%

Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

et al. 2022

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The coke reactivity index and coke strength after reaction are critical parameters for the efficient operation of a blast furnace. Therefore, maintaining desired qualities of the produced coke as per coal blend chemistry and coke oven battery parameters is essential. However, the coke reactivity index (CRI) and coke strength after reaction (CSR) vary from laboratory to laboratory even though they have the same determination methodology. In the present investigation, a unique laboratory sample holder for reactivity test has been developed. The test method by Nippon Steel Corporation (NSC) has been compared with the newly developed sample holder method. The correlation between coke CRI and CSR has been studied with samples with a wide range of reactivity in the repeatability test. Results confirmed that the reactivity of coke highly depends on the reaction of individual coke pieces participating in the test. Despite undergoing strict process monitoring of the testing procedure of hot strength of coke, the present study confirmed that a variation of ±2 points in coke CSR and CRI does not affect coke quality in a single reading. The study also includes the influence of the number of coke pieces in the test sample to optimize the coke bed height. This paper described in detail the methodologies adopted, addressing the factors resulting in differences in CRI/CSR values within the same coke.

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Section: Introductionmentioning

confidence: 93%

Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

et al. 2022

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“…According to the wavelength of X-ray radiation(λ), the entire width of 002 carbon peaks at half maximum intensity(β) and the diffraction angle of 002 bands(θ) of Fig. 4, the average stacking height The reaction temperature has the most significant effect on ordering the carbon structure of coke 28) .…”

Section: The Graphitization Of Bf Residual Fine Particlesmentioning

confidence: 99%

Characteristics of Residual Fine Particles in a Blast Furnace

Wu,

Liang,

Xie

et al. 2024

ISIJ Int.

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Fine particles can reduce the blast furnace's gas and liquid permeability. The residual fine particle sampling and screening of the overhaul blast furnace were carried out to obtain particle size distribution. Chemical analysis, XRD, and SEM-EDS were used to analyze the chemical and phase composition, degree of graphitization, and microstructure to clarify the characteristics and evolution of fine particles. The results show a clear correlation between particle size and chemical composition.Although the phase components of different-size particles are similar in the same area, their chemical contents are quite different. The chemical and phase composition of particles with the same particle size significantly differ in the other regions. The fine particles in the S1 region mainly consist of coke powder, ZnO, and alkali metals. Significant amounts of slag iron minerals and C coexist in the fine particles of the S2 area. The slag iron minerals contents and the carbon graphitization degree of fine particles increase as the furnace burden descends.

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“…The influence of temperature, CO 2 concentration and reaction duration on coke strength had been carried out in the laboratory. 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 [7–14] and graphitization [15–18] were affected by its surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of reaction conditions on coke tumbling strength, carbon structure and mineralogy

Cited by 25 publications

References 11 publications

Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

Characteristics of Residual Fine Particles in a Blast Furnace

Microstructure analysis and mineral phase transformation of coke in blast furnace

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