Reduction Mechanism of Composite Consisted of Coal and Hematite Ore by Volatile Matter at 700–1100 K

Takyu, Yuki; Murakami, Taichi; Son, Sang Han; Kasai, Eiki

doi:10.2355/isijinternational.55.1188

Cited by 19 publications

(17 citation statements)

References 24 publications

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“…It was also reported that the reduction of composite Fig. 3 Effect of various process parameters on the reduction kinetics of iron oxide-carbon composite pellet a carbon content [54], b additives [13], c char particle size [19], d pellet size [54], e ambient atmosphere [59], and f coal volatiles [65] pellet in RHF for DRI production can reduce both energy and CO 2 emissions [94]. Recently, Mishra and Roy [26,57,95] have tried to increase the heat and mass transfer in multilayer bed RHF by altering the size, shape, bed packing material, and composition of the pellet.…”

Section: Industrial Use Of Iron Ore-coal Composite Pelletmentioning

confidence: 98%

“…Hematite was found to be more effective in coal pyrolysis than magnetite. Takyu et al [65] studied the reduction mechanism of hematite ore-coal composite pellet by volatile matter at 630-830 °C. They reported that the extent of reduction increases with the increase in volatile in coal up to a certain limit, beyond which there is no beneficial effect.…”

Section: Coal Volatilesmentioning

confidence: 99%

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Review on Reduction Kinetics of Iron Ore–Coal Composite Pellet in Alternative and Sustainable Ironmaking

Mishra

2020

J. Sustain. Metall.

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The use of iron ore-coal composite pellet as a raw material for iron making is an ongoing area of research. Investigations on composite pellet reduction have reported some interesting phenomena, and experimental and modeling results, in which consistent and inconsistent conclusions have been presented in the literature. The aim of this review is to summarize the fundamentals of reduction kinetics of iron ore-coal composite pellet and the effect of various process parameters such as compositions, particle size, pellet geometry, ambient atmosphere and its partial pressure, heating conditions, and compaction pressure, etc., on it. The industrial application of composite pellet is also discussed. This article will be useful for the researchers carrying out experimental as well as modeling work related to the iron oxide-carbon composite pellet reduction.

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Section: Industrial Use Of Iron Ore-coal Composite Pelletmentioning

confidence: 98%

Section: Coal Volatilesmentioning

confidence: 99%

Review on Reduction Kinetics of Iron Ore–Coal Composite Pellet in Alternative and Sustainable Ironmaking

Mishra

2020

J. Sustain. Metall.

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“…Most coal generates H 2 at the temperatures above 600°C. 14,15) But some coal generates H 2 at lower temperature, about 400-600°C. 16) When the reduction degree of PRI is increased, adding H 2 is also important.…”

Section: Discussionmentioning

confidence: 99%

Conditions for Minimizing Direct Reduction in Smelting Reduction Iron Making

Shim

Jung

2018

ISIJ Int.

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“…There are some studies regarding the reduction of ore-coal composite pellets [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Kasai et al carried out some reduction experiments in a combustion bed packed with the composite pellets.…”

Section: Introductionmentioning

confidence: 99%

“…Takyu et al have fundamentally examined the reduction by volatile matter in a coalhematite ore composite. They found that the reduction degree of hematite ore initially increased with increasing content of volatile matter in coal, and that control of the heating rate is a possible way to promote reduction at a low temperature [6].…”

Section: Introductionmentioning

confidence: 99%

Carbothermic Reduction of Ore-Coal Composite Pellets in a Tall Pellets Bed

et al. 2018

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Recently, increasing attention has been paid to alternative ironmaking processes due to the desire for sustainable development. Aiming to develop a new direct reduction technology, the paired straight hearth (PSH) furnace process, the carbothermic reduction of ore-coal composite pellets in a tall pellets bed was investigated at the lab-scale in the present work. The experimental results show that, under the present experimental conditions, when the height of the pellets bed is 80 mm (16–18 mm each layer, and 5 layers), the optimal amount of carbon to add is C/O = 0.95. Addition of either more or less carbon does not benefit the production of high quality direct reduced iron (DRI). The longer reduction time (60 min) may result in more molten slag in the top layer of DRI, which does not benefit the actual operation. At 50 min, the metallization degree could be up to 85.24%. When the experiment was performed using 5 layers of pellets (about 80 mm in height) and at 50 min duration, the productivity of metallic iron could reach 55.41 kg-MFe/m2·h (or 75.26 kg-DRI/m2·h). Therefore, compared with a traditional shallow bed (one or two layers), the metallization degree and productivity of DRI can be effectively increased in a tall pellets bed. It should be pointed out that the pellets bed and the temperature should be increased simultaneously. The present investigation may give some guidance for the commercial development of the PSH process in the future.

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Reduction Mechanism of Composite Consisted of Coal and Hematite Ore by Volatile Matter at 700–1100 K

Cited by 19 publications

References 24 publications

Review on Reduction Kinetics of Iron Ore–Coal Composite Pellet in Alternative and Sustainable Ironmaking

Review on Reduction Kinetics of Iron Ore–Coal Composite Pellet in Alternative and Sustainable Ironmaking

Conditions for Minimizing Direct Reduction in Smelting Reduction Iron Making

Carbothermic Reduction of Ore-Coal Composite Pellets in a Tall Pellets Bed

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