Reduction of Molten Iron Oxide and FeO Bearing Slags by H2-Ar Plasma

Kamiya, Kōji; Kitahara, Nobuyasu; Morinaka, Isao; Sakuraya, Kazuyuki; Ozawa, Masashi; Tanaka, Minoru

doi:10.2355/isijinternational1966.24.7

Cited by 31 publications

(34 citation statements)

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“…Badr [13] studied the characteristics of the HPSR process in terms of thermodynamics, kinetics, and the possibility of industrialization. His results have confirmed the observations of previous researchers [20,25,26].…”

Section: Thermodynamic Properties Of Thermal Plasmasupporting

confidence: 90%

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Thermodynamic of Liquid Iron Ore Reduction by Hydrogen Thermal Plasma

Seftejani

Schenk

2018

Metals

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The production of iron using hydrogen as a reducing agent is an alternative to conventional iron- and steel-making processes, with an associated decrease in CO2 emissions. Hydrogen plasma smelting reduction (HPSR) of iron ore is the process of using hydrogen in a plasma state to reduce iron oxides. A hydrogen plasma arc is generated between a hollow graphite electrode and liquid iron oxide. In the present study, the thermodynamics of hydrogen thermal plasma and the reduction of iron oxide using hydrogen at plasma temperatures were studied. Thermodynamics calculations show that hydrogen at high temperatures is atomized, ionized, or excited. The Gibbs free energy changes of iron oxide reductions indicate that activated hydrogen particles are stronger reducing agents than molecular hydrogen. Temperature is the main influencing parameter on the atomization and ionization degree of hydrogen particles. Therefore, to increase the hydrogen ionization degree and, consequently, increase of the reduction rate of iron ore particles, the reduction reactions should take place in the plasma arc zone due to the high temperature of the plasma arc in HPSR. Moreover, the solubility of hydrogen in slag and molten metal are studied and the sequence of hematite reduction reactions is presented.

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Section: Thermodynamic Properties Of Thermal Plasmasupporting

confidence: 90%

“…Kamiya et al [26] studied the reduction of molten iron oxide using H 2 -Ar plasma. They reported that the hydrogen utilization degree can be 60% at low concentration of hydrogen in the gas mixture.…”

Section: H 2 +mentioning

confidence: 99%

Thermodynamic of Liquid Iron Ore Reduction by Hydrogen Thermal Plasma

Seftejani

Schenk

2018

Metals

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“…One of the main results was a lower degree of hydrogen utilisation (η H 2 ) when using a high concentration of hydrogen in the mixture of H 2 -Ar. Their results were in good agreement with the observations of other researchers [28][29][30][31][32]. In the present study, the concentration of hydrogen in the gas mixture was set to be constant.…”

Section: Introductionsupporting

confidence: 92%

Slag Formation during Reduction of Iron Oxide Using Hydrogen Plasma Smelting Reduction

et al. 2020

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Replacing carbon by hydrogen is a huge step towards reducing CO2 emissions in the iron- and steel-making industry. The reduction of iron oxides using hydrogen plasma smelting reduction as an alternative to conventional steel-making routes has been studied at Montanuniversitaet Leoben, Austria. The aim of this work was to study the slag formation during the reduction process and the reduction behaviour of iron oxides. Furthermore the reduction behaviour of iron ore during continuous feeding was assessed. Mixtures of iron ore and calcined lime with a basicity of 0, 0.8, 1.6, 2.3, and 2.9 were melted and reduced by hydrogen. The off-gas composition was measured during the operations to calculate the process parameters. The reduction parameters, namely the degree of reduction, degree of hydrogen utilisation, produced iron, and slag, are presented. The results of the batch-charged experiments showed that at the beginning of the reduction process, the degree of hydrogen utilisation was high, and then, it decreased over the operation time. In contrast, during the continuous-feeding experiment, the degree of hydrogen utilisation could be kept approximately constant. The highest degrees of reduction and hydrogen utilisation were obtained upon the application of a slag with a basicity of 2.3. The experiment showed that upon the continuous feeding of iron ore, the best conditions for the reduction process using hydrogen could be applied.

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“…One of the main results was a lower degree of hydrogen utilisation ( 2 ) when using a high concentration of hydrogen in the mixture of H2-Ar. Their results were in good agreement with the observations of other researchers [29][30][31][32][33]. In the present study, the concentration of hydrogen in the gas mixture was set to be constant.…”

Section: Introductionsupporting

confidence: 92%

Slag Formation During Reduction of Iron Oxide Using Hydrogen Plasma Smelting Reduction

Seftejani

Schenk

Spreitzer

et al. 2020

Preprint

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Replacing carbon by hydrogen is a huge step towards reducing CO2 emissions in the iron- and steel-making industry. The reduction of iron oxides using hydrogen plasma smelting reduction as an alternative to conventional steel-making routes has been studied at Montanuniversitaet Leoben, Austria. The aim of this work was to study the slag formation during the reduction process and the reduction behaviour of iron oxides. Furthermore, the reduction behaviour of iron ore during continuous feeding was assessed. Mixtures of iron ore and calcined lime with a basicity of 0, 0.8, 1.6, 2.3, and 2.9 were melted and reduced by hydrogen. The off-gas composition was measured during the operations to calculate the process parameters. The reduction parameters, namely the degree of reduction, degree of hydrogen utilisation, produced iron, and slag, are presented. The results of the batch-charged experiments showed that at the beginning of the reduction process, the degree of hydrogen utilisation was high, and then, it decreased over the operation time. In contrast, during the continuous-feeding experiment, the degree of hydrogen utilisation could be kept approximately constant. The highest degrees of reduction and hydrogen utilisation were obtained upon the application of a slag with a basicity of 2.3. The experiment showed that upon the continuous feeding of iron ore, the best conditions for the reduction process using hydrogen could be applied.

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Reduction of Molten Iron Oxide and FeO Bearing Slags by H2-Ar Plasma

Cited by 31 publications

References 0 publications

Thermodynamic of Liquid Iron Ore Reduction by Hydrogen Thermal Plasma

Thermodynamic of Liquid Iron Ore Reduction by Hydrogen Thermal Plasma

Slag Formation during Reduction of Iron Oxide Using Hydrogen Plasma Smelting Reduction

Slag Formation During Reduction of Iron Oxide Using Hydrogen Plasma Smelting Reduction

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