Coke texture, reactivity and tumbler strength after reaction under simulated blast furnace conditions

Zhang, Weiji; Shi, Ting; Zhang, Zuo‐Feng; Yinping, Cao; Qian, Hui; Wu, Xiaoqing; Li, Jing; Zhang, Qun; Yang, Guangzhi; Yang, Jing

doi:10.1016/j.fuel.2019.04.057

Cited by 23 publications

(9 citation statements)

References 19 publications

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“…It was found that when the mineral effect was not strong, the CRI decreased with the increasing Lc and La. During the CO 2 gasification reaction, the isotropic texture in the coke reacted more quickly than the anisotropic texture [ 42 , 43 , 44 , 45 ]. The higher value of the ∑ISO of the coke is, the higher CRI of the coke will be.…”

Section: Relations Between Coke Structures and Propertiesmentioning

confidence: 99%

“…In that sense, all the optical textures except isotropic and inert can be considered anisotropic. Zhang et al [ 45 ] evaluated the optical texture of six cokes from different plants according to Chinese standard YB/T 077-2017 (method for determination of coke visual structure). He found the coke with higher isotropic texture content exhibited higher reactivity.…”

Section: Characterization Of Coke Structuresmentioning

confidence: 99%

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A Comprehensive Review of Characterization Methods for Metallurgical Coke Structures

Zheng

Zhang

et al. 2021

Materials

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The structure of coke affects its reactivity and strength, which directly influences its performance in the blast furnace. This review divides coke structures into chemical structure, physical structure, and optical texture according to their relevant characteristics. The focuses of this review are the current characterization methods and research status of the coke structures. The chemical structures (element composition and functional group) can be characterized by elemental analysis, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (Raman), X-ray photoelectron spectroscopy (XPS), and nuclear magnetic resonance imaging technology (13C NMR). The physical structures (pore structure and micro-crystallite structure) can be characterized by image method, X-ray CT imaging technique, mercury intrusion method, nitrogen gas adsorption method, X-ray diffraction method (XRD), and high-resolution transmission electron microscopy (HRTEM). The optical textures are usually divided and counted by a polarizing microscope. In the end, this review provides an idea of the construction of a coke molecular structural model, based on the above characterization. With the coke model, the evolution principles of the coke can be calculated and simulated. Hence, the coke performance can be predicted and optimized.

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Section: Relations Between Coke Structures and Propertiesmentioning

confidence: 99%

Section: Characterization Of Coke Structuresmentioning

confidence: 99%

A Comprehensive Review of Characterization Methods for Metallurgical Coke Structures

Zheng

Zhang

et al. 2021

Materials

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“…Coke also supports the entire media in blast furnaces and participates in complicated multiple-phase reactions, especially in cohesive zones, because sinter, pellet, and ore begin to melt at high temperatures. In addition, coke acts as the only solid material that greatly affects the gas distribution and stability of blast furnaces [ 3 , 4 ]. Consequently, the role of coke as a structural support medium enhances.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive investigation of the reaction behaviorial features of coke with different CRIs in the simulated cohesive zone of a blast furnace

Tian

Zhou

et al. 2021

PLoS ONE

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The reaction characteristics and mechanism of coke with different coke reactivity indices (CRIs) in the high-temperature zone of a blast furnace should be fully understood to correctly evaluate the coke quality and optimize ironmaking. In this work, low-CRI coke (coke A) and high-CRI coke (coke B) were charged into a thermogravimetric analyzer to separately study their microstructural changes, gasification characteristics, and reaction mechanism under simulated cohesive zone conditions in a blast furnace. The results show that both coke A and coke B underwent pyrolysis, polycondensation, and graphitization during the heat treatment. The pyrolysis, polycondensation, gasification speed, and dissolution speed rates of coke B were higher than those of coke A. Direct and indirect reduction between sinter and coke occurred in the cohesive zone and had different stages. The consumption rate of coke B was faster than that of coke A during the coke–sinter reduction. The carbon molecules of coke A must absorb more energy to break away from the skeleton than those of coke B.

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“…In our former publication [ 15 ], we reported our revised simulated conditions for coke evaluation at high temperature. The reaction temperature was up to 1350 °C and the total reaction time was about 334 min.…”

Section: Introductionmentioning

confidence: 99%

A Simple Method of Evaluating the Thermal Properties of Metallurgical Cokes under High Temperature

et al. 2021

Self Cite

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The reactivity index of weight loss (RI) and tumbling strength after the reaction (I10600) of manufacturing coke were first tested at a temperature series of 1100, 1200, and 1300 °C under CO2 atmosphere with different compositions and duration times to study the effects of temperature, time, and gas composition on coke hot strength. Then the RI/I10600, carbon structure, and optical texture of the cokes prepared from different single coals were mainly studied after a solution reaction with CO2 under a high temperature of 1300 °C and a standard temperature of 1100 °C. It was found that temperature greatly affects the RI/I10600 of coke, especially at high temperatures up to 1300 °C. Compared with standard tests under 1100 °C, the changes of RI/I10600 for different cokes are very different at 1300 °C, and the changes are greatly related to coke optical texture. Under a high temperature in the testing method, the tumbling strength of cokes with more isotropy increased, whereas it decreased for those with less isotropy. This simple method of using high temperature could yield the same results when compared with complicated simulated blast furnace conditions.

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Coke texture, reactivity and tumbler strength after reaction under simulated blast furnace conditions

Cited by 23 publications

References 19 publications

A Comprehensive Review of Characterization Methods for Metallurgical Coke Structures

A Comprehensive Review of Characterization Methods for Metallurgical Coke Structures

A comprehensive investigation of the reaction behaviorial features of coke with different CRIs in the simulated cohesive zone of a blast furnace

A Simple Method of Evaluating the Thermal Properties of Metallurgical Cokes under High Temperature

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