Effect of Volume Breakage Due to DI Measurement on Pore Structure in Coke

Sakimoto, Naoto; Takanohashi, Toshimasa; Sakai, Koji; Shishido, Takahiro; Yoshida, Takuya; Okuyama, Noriyuki

doi:10.2355/isijinternational.isijint-2015-388

Cited by 14 publications

(24 citation statements)

References 10 publications

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“…The strength and bulk density of coke are important parameters that determines its usability in a blast furnace. 1,3) High strength is needed to support the iron ore charge while porous structure allows gases to pass through the furnace. An industrial coke making process, starting material (Charge) is a blend of coking coal, caking coal, and non-caking coal, and the mixing ratio is typically an industrial secret.…”

Section: Introductionmentioning

confidence: 99%

“…There have been renewed interest in using oil/coal derived additives as binders to produce cokes from low rank non-coking coals. [3][4][5] However, the coke strength required for the commercial use in a blast furnace has not been achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Another approach is to chemical upgrade the coal by increasing its H/C ratio by solvent treatment. [3][4][5][6][7][8][9][10][11][20][21][22][23][24][25] Takanohashi et al treated different coals with 1-MN and obtained 1-MN soluble fractions. 7,32) This 1-MN soluble coal fraction was called coal-derived binder.…”

Section: Introductionmentioning

confidence: 99%

“…3,5,[6][7][8][9]27,29,31) They investigated the interactions between caking and slightly caking or non-caking coals using NMR analysis and H/C ratio and concluded that the binders (HPC) enhance the thermo-plasticity of the coal blend due to their high thermo-plasticity and overlapping thermoplastic temperature range with that of coals. 3,[19][20][21][23][24][25][26][27] Sakimoto et al introduced carbon matrix connectivity index to estimate the coke drum index which directly correlates with the coke strength. 3,29) They concluded that the addition of binders (HPC) increase the carbon matrix connectivity of the coke leading to increased coke strength.…”

Section: Introductionmentioning

confidence: 99%

“…3,[19][20][21][23][24][25][26][27] Sakimoto et al introduced carbon matrix connectivity index to estimate the coke drum index which directly correlates with the coke strength. 3,29) They concluded that the addition of binders (HPC) increase the carbon matrix connectivity of the coke leading to increased coke strength. Sharma et al reported production of high strength carbon composites with fracture strengths (tensile strength) much higher than the commercial cokes from non-caking coals only by adding coal derived binders.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Carbonization Heating Rate on the Tensile Strength of Cokes Prepared from Chemically Upgraded Low Rank Coals

et al. 2019

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In this study, effect of carbonization heating rate and solvent removal method on the tensile strength of cokes prepared from chemical upgraded coal samples was investigated. A low rank coal, L coal, was solvent treated at 420°C, 2 h with 1-methylnapthlene (1-MN) solvent. Upgraded coal samples were obtained by removing 1-MN from the solvent treated samples. Two different approaches were applied to remove 1-MN from the treated samples; washing with tetrahydrofuran (THF) and that with n-hexane (HEX). All upgraded samples were first pelletized under a mechanical pressure and time of 40 MPa and 10 min, respectively, and then carbonized at heating rate of 3, 10 or 25°C/min. Carbonized coke samples strength was measured as tensile strength (MPa). It was found that lower heating rate gave higher tensile strength irrespective of solvent removal method. This may be due to that lower heating rates allowed the coal upon heating to undergo softening, melting and re-solidification for longer time. n-HEX-washed upgraded samples showed higher strength than THF-washed ones when the same heating rates were applied. Surfaces of coke samples were observed by scanning electron microscopy (SEM) and it was found that pore development structures of cokes n-HEX-washed samples and those from THF-washed samples were different from each other. This difference may be responsible for that in the strength.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%