Reduction Behaviors of Pellets Under Different Reducing Potentials

Zuo, Xiaojian; Wang, Jingsong; An, Xiu-wei; She, Xuefeng; Xue, Qingguo

doi:10.1016/s1006-706x(13)60210-1

Cited by 14 publications

(8 citation statements)

References 7 publications

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“…Geiger and Lowry 19 thought that reduced iron could rise the rate of carbon deposition. Other studies [20][21][22] also indicated that there was carbon-deposition phenomenon in the process of iron ore reduction.…”

Section: Introductionmentioning

confidence: 93%

The effect of hydrogen addition on the carbon-deposition behaviour during the reduction of pellets for the blast furnace process

Wang

Ouyang

et al. 2016

Ironmaking & Steelmaking

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With the application of large amount of pulverised coal injection into the blast furnace, the hydrogen content in the gas will increase, which accelerates the reduction of iron ore in lump zone of the blast furnace as well as carbon-deposition reaction. This study has investigated the effect of hydrogen addition on carbon-deposition reaction during the reduction of pellets through thermodynamic calculation and experiment. The results show that H 2 can promote the carbon-deposition reaction, while the increase of temperature and CO 2 can significantly inhibit it. The preference region of temperature for C formation is about 600°C. Moreover, the promotion effect of H 2 on the carbon-deposition reaction at 700°C is better than that at 600°C. The SEM observation results show that the generated carbon is mainly distributed on the surface of the pellet, and only a little carbon is located inside the pellet. The agglomerated carbon could be more easily formed due to the dramatic carbon-deposition reaction caused by the lower temperature or higher H 2 content. But, most of the carbon just exists as an individual particle at the lower carbon-deposition reaction rate. The results of SEM-EDS reveal that carbon deposited is primarily in the form of elemental carbon rather than in the form of cementite. The study also shows that with increasing reduction time, the rate of carbon-deposition increases, mainly due to the promotion effect of reduced iron during the reduction process of pellets.

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Section: Introductionmentioning

confidence: 93%

The effect of hydrogen addition on the carbon-deposition behaviour during the reduction of pellets for the blast furnace process

Wang

Ouyang

et al. 2016

Ironmaking & Steelmaking

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“…Yin et al [ 106 ] used a Borist Furnace to mimic the reduction process in the shaft of the BF with low pulverized coal injection or oxygen‐enriched blast, or both oxygen enriched blast and pulverized coal injection, respectively. Zuo et al [ 107 ] studied the impact of reducing gas (H 2 and CO) on the reduction behavior of pellets in the TGR‐OBF process, whereas Lan et al [ 108 ] conducted a series of sinter reduction experiments in OBF atmosphere using the thermal balance weight loss method. The changes in reduction degree and reduction rate were investigated and the sinter reduction dynamics was also analyzed.…”

Section: Obf Experimental Researchmentioning

confidence: 99%

A Review on Explorations of the Oxygen Blast Furnace Process

Zhang

Dai

et al. 2020

steel research int.

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The oxygen blast furnace (OBF) process has been extensively studied theoretically because of the potentials of promising energy conservation and CO2 emission reduction. Herein, investigations of the OBF process are reviewed and some suggestions for its future development are presented. The main findings can be condensed into the following: static and dynamic models of the OBF should be revised to considering the newest theoretical findings in the thermodynamics and kinetics involved as well as the particular limitations of the technology. Models focusing on energy demand and emissions should be further developed and applied to enhance the design for increased efficiency and sustainability of the complicated OBF system. It will be challenging to operate the full OBF process with top gas recycling (TGR). The development of mathematical models focusing on the practical operation is therefore warranted and would provide useful tools for tackling control problems and difficulties that will arise in forthcoming industrial trials. Considering these potential challenges, a medium oxygen‐enriched blast furnace with TGR as a forerunner is suggested because its operation conditions show greater resemblance with those of the traditional blast furnace. This furthermore provides a path of transition to the use of the full OBF in industrial scale.

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“…The addition of hydrogen to carbon monoxide will significantly accelerate reduction. 20 Generally, compared with the reduction behaviour of sinter, the effect of gas composition variation on pellet is more remarkable in the OBF, which is determined primarily by the nature of the charge. The RI increase in pellet in OBF can obviously improve reduction behaviour of the charge mix, which is beneficial for improving metallurgical properties of burden in the cohesive zone of a blast furnace.…”

Section: Comparative Analysis Of Sinter and Pellet In Reduction Ratementioning

confidence: 99%

Reduction behaviour of ferrous burden under simulated oxygen blast furnace conditions

Liu

Wang

Zhang

et al. 2014

Ironmaking & Steelmaking

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The reduction behaviour of sinter and pellets was investigated by a programmable reduction apparatus to simulate the traditional blast furnace (TBF) and the oxygen blast furnace (OBF). The starting temperature for reduction of sinter and pellet in the OBF decreased 60 and 150uC compared with that in the TBF and, by the time the temperature reached 1100uC the reduction degree of sinter and pellet was 100.0 and 98.7% in the OBF compared to 94.0 and 83.1% in the TBF. The trends of the reduction rate of sinter and pellet were consistent in OBF and TBF. There are two peak values at about 60 and 80 min and in the OBF the third peak value of pellet emerged at 40 min. In addition, the mineral microstructures of the ferrous burden were characterised by means of SEM and the area proportion of metallic iron zone was obtained by SEM photos.

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Reduction Behaviors of Pellets Under Different Reducing Potentials

Cited by 14 publications

References 7 publications

The effect of hydrogen addition on the carbon-deposition behaviour during the reduction of pellets for the blast furnace process

The effect of hydrogen addition on the carbon-deposition behaviour during the reduction of pellets for the blast furnace process

A Review on Explorations of the Oxygen Blast Furnace Process

Reduction behaviour of ferrous burden under simulated oxygen blast furnace conditions

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