Effect of HPC (Hyper-coal) on Strength of Ferro-coke during Caking Temperature

Uchida, Ataru; Yamazaki, Yoshiaki; Matsuo, Shohei; Saito, Yasuhiro; Matsushita, Yohsuke; Aoki, Hideyuki; Hamaguchi, Maki

doi:10.2355/isijinternational.isijint-2017-130

Cited by 14 publications

(9 citation statements)

References 14 publications

(21 reference statements)

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“…Then, hyper-coal (HPC) and high fluidity hyper-coal (HF-HPC) were as two different binders added in the same coal; the results showed that HPC and HF-HPC could both enhance adhesiveness between coal particles. The HF-HPC had a stronger liquidity after soft melting, so that it had a greater promotion effect on the ferro-coke compressive strength than HPC [ 22 , 23 ]. In the previous studies, however, the addition amounts of iron ore powder were all less than 30%.…”

Section: Introductionmentioning

confidence: 99%

Effect of Binders on the Crushing Strength of Ferro-Coke

Deng

Wang

et al. 2021

Materials

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Ferro-coke, as a new burden of blast furnace (BF), can not only greatly reduce the energy consumption and CO2 emission, but also promote the resource utilization by using the low-quality iron ore and low-grade coal. However, the strength of ferro-coke decreased with the increasing amount of iron ore powder. In order to maintain the strength of ferro-coke while increasing the amount of iron ore powder, it is necessary to add binder during the coking process to enhance the strength of ferro-coke. In this paper, phenolic resin, silicon metal powder, corn starch, and coal tar pitch were used as binder for the fabrication of ferro-coke. I-type drum machine (I 600), scanning electron microscope (SEM), and X-ray diffraction (XRD) were applied to test the crushing strength, morphology, and microcrystalline structure of the ferro-coke. The results showed that the increasing amount of iron ore powder resulted in lower crushing strength, higher porosity, and the worse macroscopic morphology of ferro-coke. When the amount of iron ore powder reached 40%, obvious cracks appeared on the surface of ferro-coke. When the amount of iron ore was 30%, the crushing strength of ferro-coke dropped to 18.15%. Among the four binders, coal tar pitch could significantly enhance the cold crushing strength of ferro-coke through decreasing the porosity of ferro-coke and improving the bonding effect between carbon matrix particles. In the case of the 10% coal tar pitch addition, the cold crushing strength of ferro-coke was increased from 18.15% to 76.41%; meanwhile, its hot compression strength during gasification improved by 100N.

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Section: Introductionmentioning

confidence: 99%

Effect of Binders on the Crushing Strength of Ferro-Coke

Deng

Wang

et al. 2021

Materials

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“…Qiu et al [21] investigated the effect of three iron compounds (Fe 3 O 4 , Fe 2 O 3 , FeC 2 O 4 Á2H 2 O) on the coking performance and properties of ferro-coke, and revealed that the iron compounds had little effect on the pyrolysis of coal, but had a strong influence on the strength of ferro-coke. In order to improve the strength of ferro-coke, Uchida et al [22][23][24] added a hyper-coal binder into the raw materials of ferro-coke and studied the effect of hyper-coal binder addition and iron ore reduction on the strength of ferro-coke in detail. Their results showed that the hyper-coal binder reduced the detrimental effect caused by the iron ore reduction and improved the adhesiveness of coal particles.…”

Section: Introductionmentioning

confidence: 99%

Influence of initial iron ore particle size on CO2 gasification behavior and strength of ferro-coke

Deng

Zheng

et al. 2020

J. Iron Steel Res. Int.

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Highly reactive ferro-coke has been widely studied due to its contribution to the energy saving and emission reduction in blast furnace ironmaking. To optimize the coking process of ferro-coke and improve its metallurgical properties, it is necessary to clarify the influence of initial iron ore on the strength, micro-morphology and CO 2 gasification reaction behavior of formed ferro-coke. The effects of initial iron ore particle size (0.50-1.00, 0.25-0.50 and 0.074-0.125 mm) on the CO 2 gasification reaction of ferro-coke were analyzed using thermo-analysis technique. In addition, the effects of initial iron ore particle size on the strength and morphology of ferro-coke were investigated by drum test, digital microscopy and scanning electron microscopy. The results show that iron reduced from iron ore has a great promotion effect on the CO 2 gasification reaction of ferrocoke. The smaller the particle size of initial iron ore, the more intense the gasification reaction, and the lower the starting temperature for gasification reaction of ferro-coke. The results of kinetic calculation show that the apparent activation energy of ferro-coke decreases with the decreasing particle size of blended iron ore. The particle size of initial iron ore has a great impact on the strength of ferro-coke. The ferro-coke prepared by 0.25-0.50 mm iron ore presents the best strength in this experiment.

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“…For the effect of different iron ores on the gasification of ferro-coke, Murakami et al revealed that hematite and goethite ore, which contained high combined water, could reduce the gasification beginning temperature by 30 and 50 °C, respectively, than that of a sample without the iron mineral addition. In order to further increase ferro-coke strength, Uchida et al mixed iron mineral and raw coals with some binders before the fabrication, and revealed that the formed ferro-coke had less big pores and better strength. , In addition to studying the metallurgical properties of ferro-coke, some scholars have investigated the ferro-coke coking behavior and its effect on coke ovens. Nomura et al − found that the iron minerals did not react with traditional silica bricks used in a coke oven chamber at 1100 °C.…”

Section: Introductionmentioning

confidence: 99%

“…In order to further increase ferro-coke strength, Uchida et al mixed iron mineral and raw coals with some binders before the fabrication, and revealed that the formed ferro-coke had less big pores and better strength. 16,17 In addition to studying the metallurgical properties of ferro-coke, some scholars have investigated the ferro-coke coking behavior and its effect on coke ovens. Nomura et al 18−20 found that the iron minerals did not react with traditional silica bricks used in a coke oven chamber at 1100 °C.…”

Section: Introductionmentioning

confidence: 99%

Influence of Iron Minerals on the Volume, Strength, and CO₂ Gasification of Ferro-coke

Zheng

Wang

et al. 2018

Energy Fuels

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The briquette volume evolution during the coking process is very important for the operation and health of a coke oven. The strength and CO2 gasification of formed ferro-coke determine its utilization as well as its effects on the blast furnace status. To enhance ferro-coke better performance during fabrication and utilization, a better understanding of the influence of iron minerals on the volume, strength, and CO2 gasification of ferro-coke is necessary. This study investigated the effects of different iron mineral fines (oolitic hematite, hematite, and limonite) on the volume evolution of blended briquettes (iron ore and coal) during the carbonization process using thermal-platform microscopy. Drum tests, diametral compression tests, and gasification tests were conducted on the formed ferro-coke. The microstructure and crystal structure of ferro-coke were characterized using SEM and XRD, respectively. This study reveals that the iron mineral type has little effect on the swelling behavior of blended briquettes but will strongly suppress the shrinkage behavior of the briquettes during the coking process, especially in the case of high iron mineral additions. The added amount of iron mineral has a greater influence on the volume change than does the iron mineral type. With increasing amounts of iron mineral, the strength of the ferro-coke strongly decreases. The impact of hematite, limonite, and oolitic hematite on the strength of formed ferro-coke gradually becomes weak. The influence of iron mineral on the gasification of formed ferro-coke decreases from hematite to oolitic hematite to limonite. The type and added amount of iron mineral fine have no influence on the gasification mechanism of ferro-coke. The minimum weighted mean activation energy of ferro-coke prepared by hematite contributes to its highest gasification reactivity.

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Effect of HPC (Hyper-coal) on Strength of Ferro-coke during Caking Temperature

Cited by 14 publications

References 14 publications

Effect of Binders on the Crushing Strength of Ferro-Coke

Effect of Binders on the Crushing Strength of Ferro-Coke

Influence of initial iron ore particle size on CO2 gasification behavior and strength of ferro-coke

Influence of Iron Minerals on the Volume, Strength, and CO₂ Gasification of Ferro-coke

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Effect of HPC (Hyper-coal) on Strength of Ferro-coke during Caking Temperature

Cited by 14 publications

References 14 publications

Effect of Binders on the Crushing Strength of Ferro-Coke

Effect of Binders on the Crushing Strength of Ferro-Coke

Influence of initial iron ore particle size on CO2 gasification behavior and strength of ferro-coke

Influence of Iron Minerals on the Volume, Strength, and CO2 Gasification of Ferro-coke

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Influence of Iron Minerals on the Volume, Strength, and CO₂ Gasification of Ferro-coke