Swelling Behavior of Iron Ore Pellets during Reduction in H2 and N2/H2 Atmospheres at Different Temperatures

Kovtun, Oleksandr; Levchenko, Mykyta; Oldinski, Erik; Gräbner, Martin; Volkova, Olena

doi:10.1002/srin.202300140

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…The Reduction Swelling Index (RSI) quantifies the increase in pellet volume during reduction and is known to rise with increasing temperature [58,105,106]. Scharm et al found that the RSI is significantly higher in an H 2 atmosphere compared to a CO atmosphere, peaking during the first stage of reduction (Figure 13) [58].…”

Section: Results Of Research Studies Focused On the Reduction In Iron...mentioning

confidence: 99%

“…Zhao et al observed that the RSI of pellets decreases with increasing H 2 content; they also noted that temperature has a more significant impact on swelling than the composition of the reducing atmosphere [105]. Kovtun et al found that the chemical composition and porosity of pellets significantly affect the RSI; specifically, pellets with lower gangue (CaO and SiO 2 ) content exhibited higher RSI at the same temperature [106]. Conversely, Sharma et al reported that an increase in gangue content leads to a decrease in RSI [108].…”

Section: Results Of Research Studies Focused On the Reduction In Iron...mentioning

confidence: 99%

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An Overview Analysis of Current Research Status in Iron Oxides Reduction by Hydrogen

Miškovičová,

Legemza,

Demeter

et al. 2024

Metals

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This paper focuses on the study of current knowledge regarding the use of hydrogen as a reducing agent in the metallurgical processes of iron and steel production. This focus is driven by the need to introduce environmentally suitable energy sources and reducing agents in this sector. This theoretical study primarily examines laboratory research on the reduction of Fe-based, metal-bearing materials. The article presents a critical analysis of the reduction in iron oxides using hydrogen, highlighting the advantages and disadvantages of this method. Most experimental facilities worldwide employ their unique original methodologies, with techniques based on Thermogravimetric analysis (TGA) devices, fluidized beds, and reduction retorts being the most common. The analysis indicates that the mineralogical composition of the Fe ores used plays a crucial role in hydrogen reduction. Temperatures during hydrogen reduction typically range from 500 to 900 °C. The reaction rate and degree of reduction increase with higher temperatures, with the transformation of wüstite to iron being the slowest step. Furthermore, the analysis demonstrates that reduction of iron ore with hydrogen occurs more intensively and quickly than with carbon monoxide (CO) or a hydrogen/carbon monoxide (H2/CO) mixture in the temperature range of 500 °C to 900 °C. The study establishes that hydrogen is a superior reducing agent for iron oxides, offering rapid reduction kinetics and a higher degree of reduction compared to traditional carbon-based methods across a broad temperature range. These findings underscore hydrogen’s potential to significantly reduce greenhouse gas emissions in the steel production industry, supporting a shift towards more sustainable manufacturing practices. However, the implementation of hydrogen as a primary reducing agent in industrial settings is constrained by current technological limitations and the need for substantial infrastructural developments to support large-scale hydrogen production and utilization.

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Section: Results Of Research Studies Focused On the Reduction In Iron...mentioning

confidence: 99%

Section: Results Of Research Studies Focused On the Reduction In Iron...mentioning

confidence: 99%

An Overview Analysis of Current Research Status in Iron Oxides Reduction by Hydrogen

Miškovičová,

Legemza,

Demeter

et al. 2024

Metals

View full text Add to dashboard Cite

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Results of Hydrogen Reduction of Iron Ore Pellets at Different Temperatures

Kovtun,

Levchenko,

Ilatovskaia

et al. 2024

steel research int.

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The application of hydrogen as a reducing agent in existing blast furnaces presents a promising avenue for significantly reducing emissions. The current emphasis on hydrogen reduction may necessitate a review of parameters such as the temperature, chemical composition, porosity, reduction time, and reducing agent. In this study, the impact of varying the temperature of reducing iron ore pellets in hydrogen is focused on. A mercury intrusion porosimeter is used to assess the porosity postreduction. The microstructure of the reduced pellets is analyzed with the help of scanning electron microscopy. Notably, the pore size and overall porosity are higher at higher temperatures. Using an X‐ray diffractometer, it is determined that Fe2O3 is reduced to Fe across all specified temperatures at different reduction times. The maximum degree of reduction is attained at 1000 °C while the minimum degree of reduction is attained at 700 °C. Considering these characteristics, researchers in the field can identify the optimal conditions, develop strategies, and advance technologies that contribute to the production of environmentally friendly steel.

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Effect of SiO₂ and Al₂O₃ on the Thermophysical Properties and the Foaming Index of Electric Arc Furnace Slag from the Production of Construction Steel

Levchenko,

Kovtun,

Angelini

et al. 2024

steel research int.

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Viscosity, density, and surface tension of an industrial electric arc furnace (EAF) slag from production of construction steel with varying SiO2 and Al2O3 contents are investigated using a rotating viscometer and the maximum bubble pressure method. In addition, influence of thermophysical properties on foaming index is discussed. To predict the behavior of the solid phase in the slag at different temperatures, thermodynamic calculations are performed using FactSage 8.1 software. The experiments demonstratethat SiO2 and Al2O3 act as network formers in the studied slag systems, resulting in increased viscosity values in the liquid‐dominant region and decreased density of the slag. The presence of alumina and silica altered the behavior of the slag in the liquid‐dominant region, shifting the breaking point of the slags. Furthermore, the addition of silica decreases the surface tension of the slag, confirming its role as a surfactant. However, the addition of Al2O3 increases the surface tension due to the high surface tension of pure alumina. Consequently, the foaming index of the slag can increase by ≈40%, primarily due to the polymerization of the slag.

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Swelling Behavior of Iron Ore Pellets during Reduction in H₂ and N₂/H₂ Atmospheres at Different Temperatures

Cited by 5 publications

References 31 publications

An Overview Analysis of Current Research Status in Iron Oxides Reduction by Hydrogen

An Overview Analysis of Current Research Status in Iron Oxides Reduction by Hydrogen

Results of Hydrogen Reduction of Iron Ore Pellets at Different Temperatures

Effect of SiO₂ and Al₂O₃ on the Thermophysical Properties and the Foaming Index of Electric Arc Furnace Slag from the Production of Construction Steel

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Swelling Behavior of Iron Ore Pellets during Reduction in H2 and N2/H2 Atmospheres at Different Temperatures

Cited by 5 publications

References 31 publications

An Overview Analysis of Current Research Status in Iron Oxides Reduction by Hydrogen

An Overview Analysis of Current Research Status in Iron Oxides Reduction by Hydrogen

Results of Hydrogen Reduction of Iron Ore Pellets at Different Temperatures

Effect of SiO2 and Al2O3 on the Thermophysical Properties and the Foaming Index of Electric Arc Furnace Slag from the Production of Construction Steel

Contact Info

Product

Resources

About

Swelling Behavior of Iron Ore Pellets during Reduction in H₂ and N₂/H₂ Atmospheres at Different Temperatures

Effect of SiO₂ and Al₂O₃ on the Thermophysical Properties and the Foaming Index of Electric Arc Furnace Slag from the Production of Construction Steel