Reduction of Magnetite Concentrate Particles by H&lt;sub&gt;2&lt;/sub&gt;+CO at 1673 K

Wang, Haitao; Sohn, Hong Yong

doi:10.2355/isijinternational.55.706

Cited by 18 publications

(7 citation statements)

References 11 publications

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“…The drop tube reactor has been adopted as an ideal laboratory reactor for flash reduction of iron ore particles because of the advantages of fast heating rate, concurrent gas-solids flow without back mixing and particle collision, and short resident time. [3][4][5][6][7][8][9][10][11][12] The chemical reactions in the flash reduction process involves heterogeneous reactions between particles and gas, as well as homogeneous reactions among gas. The interaction between particles in the reactor is neglected due to the low volume fraction of particles.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Flash reduction behavior of iron concentrate has been well-studied in a single reduced gas including H 2 , 3-5) CO 6) and CH 4 , 7,8) and in a synthetic gas. [9][10][11][12] When iron ore is reduced by CO-CO 2 -H 2 -H 2 O system, the water gas shift reaction (WGSR) influences the reduction process. 13) This effect has been widely investigated by experiments, but most of which have focused on the pellets reduction process.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Effect of Water Gas Shift Reaction on Flash Reduction Behavior of Hematite with Syngas

Wang

et al. 2019

ISIJ Int.

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The water gas shift reaction (WGSR) is the most important side reaction in direct iron reduction processes in syngas. In this study, an Euler-Lagrange model has been developed to simulate the flash reduction behavior of hematite with syngas in a drop tube reactor. Based on model validation, the effect of WGSR on the flash reduction is investigated by comparing results predicted by models with and without WGSR. Results indicate that the WGSR has a minor effect in CO-H 2 system while a major effect in H 2-CO-CO 2-H 2 O system. The difference of gas composition caused by WGSR leads to a difference of gas reduction capacity, which results in different reduction behavior. The relationship between the composition of gas mixture and the equilibrium constant of WGSR determines the direction of WGSR and thus determines the positive or negative effect of WGSR on the reduction process. The higher oxygen partial pressure and temperature, the stronger influence of WGSR can be considered to have.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Effect of Water Gas Shift Reaction on Flash Reduction Behavior of Hematite with Syngas

Wang

et al. 2019

ISIJ Int.

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“…First, it was that gaseous reduction of REBOCI ore is much slower than that of haematite iron and magnetite iron. [18][19][20] The complete reduction of iron oxides in REBOCI ore by carbon monoxide requires temperature much more 1173 K and high reducing potential. Moreover, the impurities oxides in REBOCI ore could impeded or accelerated reduction, especially such as calcium fluoride and silicon oxides.…”

Section: Effect Of Temperaturementioning

confidence: 99%

Reduction process of rare earth Bayan Obo complex iron ore by carbon monoxide at 1073–1273 K

She

Zhao

Feng

et al. 2016

Ironmaking & Steelmaking

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This paper concerns the mechanism of iron oxide reduction and rare earth compound transformation in carbon monoxide circumstance. Rare earth Bayan Obo complex iron ore (REBOCIO) was reduced by CO-N 2 gas mixtures in a laboratory fixed bed reactor in the temperature range from 1073 to 1273 K. The influences of reductive conditions on the reduction rate including reduction temperature, reduction time and carbon monoxide content were studied. And the characteristics of reduced samples were analysed by XRD, BES and EDS. It is shown that the reduction degree increased with the increasing of temperature and monoxide content. Above 1123 K, the reduction is controlled by interfacial chemical reaction at early stage of the reaction and then turns to the internal diffusion controlling with reaction processing. The rare earth mineral transformation path at temperatures above 1123 K in the process of reduction is suggested as follow: ReCO 3 F ReOF Ce 4.667 (SiO 4 ) 3 O (and) Ca 3 Ce 2 [(Si x , P 1−x )O 4 ] 3 • F 3(1−x) (0 , x , 1)

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“…H 2 is the most active reducing agent and its reduction product is water, thereby it is an ideal substitute for carbon. Its strong diffusion and reduction ability improves the thermodynamic and kinetic conditions of iron oxide reduction and increases the reduction rate [13,14]. In addition, the smaller volume and lower viscosity of H 2 reduce the density and viscosity of gas in the blast furnace, which reduces the pressure difference and Its good thermal conductivity speeds up the heat exchange between burden and gas, thus improving the thermal energy utilization of gas in the blast furnace [15,16].…”

Section: Introductionmentioning

confidence: 99%

Review of hydrogen-rich ironmaking technology in blast furnace

Chen

Zuo

2021

Ironmaking & Steelmaking

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The global warming promotes the steel industry to replace part of coke by injecting hydrogen-rich fuel into the blast furnace to reduce CO 2 emissions and energy consumption. In this paper, the injected hydrogen-rich fuels and effects of hydrogen-rich smelting on burden reduction and property evolution were introduced, and the hot events related to hydrogen metallurgy were summarized. Increasing hydrogen content changes the thermodynamic and kinetic conditions of chemical reactions, changing the reduction behaviour of iron oxides and affecting the burden properties evolution and soft melting behaviour. Correspondingly the coke solution loss alters due to more H 2 O existence. In addition, the temperature and gas flow distribution are altered, affecting the iron oxide reduction rate and efficiency of blast furnace operation process. At present, some hydrogen metallurgy projects have been launched, making expected progress, which provides reference and thinking for the large-scale industrial application of hydrogen in blast furnace.

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Reduction of Magnetite Concentrate Particles by H<sub>2</sub>+CO at 1673 K

Cited by 18 publications

References 11 publications

Numerical Analysis of Effect of Water Gas Shift Reaction on Flash Reduction Behavior of Hematite with Syngas

Numerical Analysis of Effect of Water Gas Shift Reaction on Flash Reduction Behavior of Hematite with Syngas

Reduction process of rare earth Bayan Obo complex iron ore by carbon monoxide at 1073–1273 K

Review of hydrogen-rich ironmaking technology in blast furnace

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