Effect of Iron Carbon Agglomerates on Isothermal Reduction of Pellets with Different Reducibility

Bao, Jiwei; Chu, Mansheng; Liu, Zhenggen; Han, Dongmei; Guo, Jing; Zhang, Lifeng

doi:10.1002/srin.202100345

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…The addition of ICA among ferrous burdens can produce a synergistic coupling effect with the reduction of ferrous burdens. The CO generated by gasification reaction of ICA will increase the reduction potential of reducing gas and promote the reduction of ferrous burdens, especially the ICA with higher reactivity has a more significant promoting effect on the reduction of ferrous burdens [26]. Simultaneously, the CO 2 generated by the reduction of ferrous burdens will promote the gasification reaction of ICA.…”

Section: Resultsmentioning

confidence: 99%

“…We have studied the effect and mechanism of ICA on the reduction of ferrous burdens and proved that ICA can effectively promote the reduction of pellets [26–28]. On the basis of the previous research results, this paper mainly studies the effect and mechanism of different reactive ICAs on the softening, melting, dripping and gas permeability of BF mixed burdens.…”

Section: Introductionmentioning

confidence: 99%

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Influence mechanism of different reactive Iron Carbon Agglomerates on softening–melting–dropping properties of BF mixed burdens

Bao

Chu

Liu

et al. 2022

Ironmaking & Steelmaking

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The application of iron carbon agglomerates (ICA) in blast furnace (BF) is considered to be an innovative technology of low-carbon ironmaking. In this paper, the influence mechanism of different reactive ICAs on softening-melting-dropping properties of BF mixed burdens was revealed. The results show that mixing ICA in the ferrous burdens can effectively improve softening-melting dropping properties of mixed burdens and the improvement effect is the best when the iron ore ratio of ICA is 20%~30%. The influence mechanism is: (1) ICA has a coupling effect with the reduction of ferrous burdens, which can promote reduction of ferrous burdens and improve softening-melting performance of mixed burdens. (2) ICA can promote the molten iron carbonization and reduce the viscosity of primary slag, which can improve dropping performance of slag-iron. (3) ICA can support the skeleton of burden bed and space the burdens, which can improve gas permeability of burden bed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence mechanism of different reactive Iron Carbon Agglomerates on softening–melting–dropping properties of BF mixed burdens

Bao

Chu

Liu

et al. 2022

Ironmaking & Steelmaking

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“…Therefore, the activation energy of the mixture of ICA and sinter A is greater than that of pure sinter A. However, according to previous research results 28,44) , ICA has a significant promoting effect on the reduction of iron-bearing burdens. Therefore, it is speculated that the activation energy of the reduction reaction of sinter A in the mixture will correspondingly decrease.…”

Section: Kinetic Analysis and Establishment Of Kinetic Modelmentioning

confidence: 89%

Isothermal Reduction Kinetics of the Mixture of Iron Carbon Agglomerates and Sinter

Bao,

Chu,

Tang

et al. 2024

ISIJ Int.

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The effect of iron carbon agglomerates (ICA) on the reduction of sinter is very important to blast furnace (BF) ironmaking. In this paper, the isothermal reduction kinetics of ICA-sinters mixture and the coupling synergistic mechanism between ICA and sinter are comprehensively studied. The results show that the early stage of isothermal reduction of ICA-sinters mixture is jointly controlled by the interfacial chemical reactions of FeO being reduced to Fe in sinter and gasification reaction in ICA, and the later stage is controlled by the internal diffusion. As the reactivity of ICA improves from 52.81% to 69.71%, the isothermal reduction reaction activation energy of ICA-sinters mixture decreases from 84.22 to 72.58 kJ/mol in early stage and decreases from 110.78 to 97.41 kJ/mol in late stage. Meanwhile, the activation energy of isothermal reduction reaction for the mixture of ICA and sinter with a higher reducibility is lower. There is a coupling synergistic effect between ICA and sinters, and ICA plays a continuous role in circulating CO and transferring oxygen during the reduction of sinter, which can significantly promote the reduction of iron oxides in sinter. The synergistic effect gradually increases with the improvement of the reactivity of ICA and the reducibility of sinter.

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“…In recent years, iron coke has become one of the most popular research directions for low‐carbon ironmaking in blast furnaces. [ 11–16 ]…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, iron coke has become one of the most popular research directions for low-carbon ironmaking in blast furnaces. [11][12][13][14][15][16] Iron coke, which is also named as ferro coke and iron carbon agglomerates, is one of several innovative highly reactive cokes used as blast furnace burdens. Iron coke is helpful for energy saving, CO 2 emissions reduction, and green production of iron in the ironmaking process because it uses cheap coal resources, is highly reactive in the reduction process (in relation to the reaction rate of coke with CO 2 ), and decreases the thermal reserve zone temperature of the blast furnace.…”

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confidence: 99%

Effect of CO₂ Gasification on High‐Temperature Characteristics of Iron Coke: In Situ Compressive Strength

Liu

Chen

et al. 2022

steel research int.

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Iron and steel are one of the most important industrial raw materials, and are thus considered as a pillar of the Chinese economy. [1,2] The iron and steel industries play an important role in the national economy of China and are the foundation of its rapid industrialization and urbanization. [3] Steel production and consumption in China were 996.63 and 945.27 million tons in 2019, accounting for 53% and 50% of the world's total steel production and consumption, respectively. [4] However, iron and steel production are one of the most energy-and carbon-intensive processes in the world, and they account for more than 5% of the world's annual energy demand. [5][6][7] It is well known that carbon dioxide emission contributes to climate change and is likely to have an adverse effect on human health. [8] China has proposed the goal of achieving carbon emissions peak by 2030 and will strive to be carbon neutral by 2060. [9] Driven by the carbon neutrality target, a rapid and far-reaching clean iron and steelmaking process is expected. At present, the most common iron and steelmaking process involves a long process, named blast furnace-basic oxygen furnace (BF-BOF), which accounts for 90% of China's steel production and is emissionintensive, mainly owing to its reliance on coal. [4] In the presently used iron and steel production processes, energy consumption and CO 2 emissions mainly derive from the ironmaking process. Therefore, decreasing CO 2 emissions and reducing the energy consumption of the blast furnace used in ironmaking are of great importance for the sustainable development of the steel industry in China. [10] In the long term, hydrogen metallurgy has great potential due to its low-carbon emission levels and high efficiency for iron and steelmaking processes. However, the high cost of green hydrogen production has made it difficult for China to absolutely adopt this process. Above all, decreasing carbon emissions and energy consumption through the update of present BF-BOF processes has important practical implications. In recent years, iron coke has become one of the most popular research directions for low-carbon ironmaking in blast furnaces. [11][12][13][14][15][16] Iron coke, which is also named as ferro coke and iron carbon agglomerates, is one of several innovative highly reactive cokes used as blast furnace burdens. Iron coke is helpful for energy saving, CO 2 emissions reduction, and green production of iron in the ironmaking process because it uses cheap coal resources, is highly reactive in the reduction process (in relation to the reaction rate of coke with CO 2 ), and decreases the thermal reserve zone temperature of the blast furnace. [17][18][19][20] In the iron coke carbonization process, approximately 70% of iron oxides in the iron ore powder added to coal are reduced to metallic iron. [21] Metallic iron helps decrease the starting temperature for gasification because it has a catalytic effect on the gasification process. [22] Besides, the number of pores in iron coke is greater

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Effect of Iron Carbon Agglomerates on Isothermal Reduction of Pellets with Different Reducibility

Abstract: Research data are not shared.

Cited by 7 publications

References 25 publications

Influence mechanism of different reactive Iron Carbon Agglomerates on softening–melting–dropping properties of BF mixed burdens

Influence mechanism of different reactive Iron Carbon Agglomerates on softening–melting–dropping properties of BF mixed burdens

Isothermal Reduction Kinetics of the Mixture of Iron Carbon Agglomerates and Sinter

Effect of CO₂ Gasification on High‐Temperature Characteristics of Iron Coke: In Situ Compressive Strength

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Effect of Iron Carbon Agglomerates on Isothermal Reduction of Pellets with Different Reducibility

Abstract: Research data are not shared.

Cited by 7 publications

References 25 publications

Influence mechanism of different reactive Iron Carbon Agglomerates on softening–melting–dropping properties of BF mixed burdens

Influence mechanism of different reactive Iron Carbon Agglomerates on softening–melting–dropping properties of BF mixed burdens

Isothermal Reduction Kinetics of the Mixture of Iron Carbon Agglomerates and Sinter

Effect of CO2 Gasification on High‐Temperature Characteristics of Iron Coke: In Situ Compressive Strength

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Effect of CO₂ Gasification on High‐Temperature Characteristics of Iron Coke: In Situ Compressive Strength