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

Xu, Runsheng; Deng, Shuliang; Zheng, Heng; Wang, Wei; Song, Mingming; Xu, Wei; Wang, Fangfang

doi:10.1007/s42243-020-00454-5

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…The hightemperature compressive strength of iron coke with 40% iron ore content is <2000 N for carbonization temperatures of 700 and 800 °C, and <3000 N for temperatures of 900 and 1000 °C. The results above are higher than that of the previous studies in which high-temperature compressive strength of the iron coke after 60 min gasification is just 351.6 N. [24,25] It can be indicated that both the carbonization temperature and iron ore content have an effect on the high-temperature compressive strength of iron coke when roasted at 1100 °C for 60 min under a CO 2 atmosphere. The high carbonization temperature is beneficial at increasing the high-temperature compressive strength of iron coke.…”

Section: Compressive Strength Analysiscontrasting

confidence: 58%

“…They found that the cold crushing strength of iron coke decreased with increased amount of iron ore and that gasification had a strong effect on the hot compression strength due to carbon consumption. However, the highest value for the hot compression strength was just below 600 N and the best compression strength for iron coke after 60 min gasification was just 351.6 N. [24,25] Higuchi et al found that the cold strength of iron coke products decreased with an increase in the mixing ratio of iron ore. Iron coke with concentrations of iron ore up to 30% would have enough strength for use in the blast furnace as nut coke. [19] Uchida et al found that the coke strength is influenced by pore wall thickness rather than by the pores surrounding the iron particles generated by the consumption of the coke matrix during the reduction reaction of iron oxide.…”

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confidence: 99%

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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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Section: Compressive Strength Analysiscontrasting

confidence: 58%

mentioning

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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“…Por exemplo, a Ts diminuiu de 1080ºC para 999ºC e 957ºC com a adição de 27% e 43% de ferro, respectivamente. Outros estudos [19][20][21][22] também observaram reduções significativas na Ts com a adição de minério de ferro, variando de 55ºC a 150ºC, dependendo das condições e da proporção de minério de ferro utilizado. Além disso, outros estudos [17,18] demonstraram através de simuladores de alto-forno que a redução da Ts no CAR repercutiu em um decréscimo da temperatura da zona de reserva térmica do reator.…”

Section: Impacto Do Uso De Diferentes Fec Na Reatividade De Carunclassified

Utilização De Resíduos Siderúrgicos Na Produção De Coque Altamente Reativo: Uma Abordagem Para Redução De Emissões E Contribuição Para Economia Circular

Agra,

Biason,

Silva

et al. 2023

ABM Proceedings

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A redução das emissões de gases do efeito estufa (GEE), o aumento da eficiência energética e a reutilização de resíduos siderúrgicos são necessidades cruciais na indústria siderúrgica. Uma tecnologia estratégica que pode contribuir nesse sentido é o uso do coque altamente reativo (CAR) como substituto do nut coke nos altos-fornos. O CAR é produzido pela carbonização de misturas de carvões e minério de ferro. Este estudo analisa a utilização de resíduos siderúrgicos como substitutos do minério de ferro na produção de CAR, uma tecnologia estratégica para a redução das emissões de GEE e para a melhoria da eficiência energética na siderurgia. Os efeitos do uso desses materiais no comportamento de pirólise e termoplasticidade das misturas com carvões foram avaliados. Além disso, investigou-se a eficiência de aumento de reatividade e a resistência mecânica dos CAR produzidos. Os resultados demonstraram que, além de ser viável tecnicamente, essa abordagem oferece vantagens para certos resíduos. Por exemplo, é possível obter coques mais resistentes utilizando resíduos que apresentam menor degradação da fluidez das misturas, além de obter maior reatividade com resíduos de granulometria fina que contenham compostos catalíticos além do ferro.

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“…[ 67 ] Furthermore, Li et al [ 68 ] found that the less the gangue content in iron ore fines, the less its effect on the cold strength of iron coke would be. Wang et al [ 69 ] analyzed the effect of the initial particle size of iron ore (0.50–1.00 mm QE1, 0.25–0.50 mm QE2, and 0.074–0.125 mm QE3) on the strength of iron coke. The results showed that the initial particle size has a large effect on the strength of iron coke.…”

Section: Metallurgical Properties Of Iron Cokementioning

confidence: 99%

Performance Optimization and Efficient Application of Highly Reactive Iron Coke: Research Progress and Future Trend

Wang

Bao

et al. 2023

steel research int.

Self Cite

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Iron coke has emerged as a promising raw material for low‐carbon ironmaking. However, the structure and properties of iron coke are still obstacles to practical application in blast furnaces, especially the strength of iron coke. Herein, investigations on the preparation and properties of iron coke are reviewed and an integrated system for the performance optimization and efficient utilization of iron coke is proposed. First, the characteristics of different preparation processes for iron coke are compared; then the advantages and limitations of the three processes are summarized. Afterward, the evolution mechanism of iron coke strength and the catalytic mechanism of Fe on the gasification reaction of iron coke are explored in depth. In addition, the coupling mechanism of iron coke gasification and iron ore reduction is analyzed and discussed. The influence of iron coke on the melting–dropping properties of blast furnace charge and the mathematical simulation of using iron coke in the blast furnace are analyzed and summarized. Finally, a comprehensive strategy for the performance optimization of iron coke and its efficient application in the blast furnace is proposed, in which the sequence slicing 3D reconstruction method is applied to analyze the relationship between microstructure and performance of iron coke.

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

Cited by 7 publications

References 36 publications

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

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

Utilização De Resíduos Siderúrgicos Na Produção De Coque Altamente Reativo: Uma Abordagem Para Redução De Emissões E Contribuição Para Economia Circular

Performance Optimization and Efficient Application of Highly Reactive Iron Coke: Research Progress and Future Trend

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

Cited by 7 publications

References 36 publications

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

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

Utilização De Resíduos Siderúrgicos Na Produção De Coque Altamente Reativo: Uma Abordagem Para Redução De Emissões E Contribuição Para Economia Circular

Performance Optimization and Efficient Application of Highly Reactive Iron Coke: Research Progress and Future Trend

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

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