Dominant Factor Affecting Reducibility of Calcio-wüstite Originating from Silico-ferrite of Calcium and Aluminum

Hayashi, Miyuki; Cai, Boyuan; Susa, Masahiro

doi:10.2355/isijinternational.isijint-2020-140

Cited by 2 publications

(1 citation statement)

References 25 publications

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“…However, the difference of reducibility is influenced by the surrounding microstructure such as pores. Hayashi et al 15) investigated the reduction behavior of calcio-wustite powder originated from multi-component CF using reagents. The samples were reduced by using hightemperature XRD.…”

Section: Introductionmentioning

confidence: 99%

Influence of Crystal Structure and Chemical Composition on the Reducibility of Silico-Ferrite of Calcium and Aluminum in CO–CO2–H2–H2O Atmosphere

Maruoka,

Mataoka,

Kasai

et al. 2024

ISIJ Int.

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In this study, influence of crystal structure and chemical composition for Silico-Ferrite of Calcium and Aluminum (SFCA) on its reducibility are examined. Eight types of powder samples containing SFCA and SFCA-I were prepared using chemical reagents by the heat treatments in air. The samples were heated up to 800℃ in the different atmospheres of CO-CO 2 -H 2 -H 2 O systems. The reducibility of the samples was evaluated using the peak intensity ratio identified by XRD before and during the reduction experiment. The intensity of SFCA peak is not decreased up to 700℃ in CO-CO 2 atmosphere, whereas the intensity become weak in CO-CO 2 -H 2 -H 2 O atmosphere. The intensity of SFCA-I peak is decreased above 500 o C in all atmospheric condition and the reduction reactions are enhanced by the addition of H 2 -H 2 O gas. Decrease in intensity of SFCA peak is independent of Fe composition, whereas that of SFCA-I is decreased with decreasing Fe concentration. The difference in reducibility is attributed to the difference in the crystal structure of multi-component CF. SFCA and SFCA-I are composed of pyroxene and spinel units. Since the pyroxene unit contains more gangue minerals than spinel unit, it implies that the pyroxene unit shows low reducibility than the spinel units. Since SFCA-I contains more the spinel units than SFCA, SFCA-I is easily reduced than SFCA.

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Section: Introductionmentioning

confidence: 99%

Influence of Crystal Structure and Chemical Composition on the Reducibility of Silico-Ferrite of Calcium and Aluminum in CO–CO2–H2–H2O Atmosphere

Maruoka,

Mataoka,

Kasai

et al. 2024

ISIJ Int.

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Effect of basicity on the reduction swelling properties of iron ore briquettes

Zhang

Luo

Jia

et al. 2021

High Temperature Materials and Processes

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The influence mechanism of basicity on the reduction swelling index (RSI) of iron ore briquettes was investigated using the SEM analysis and Factsage 7.3 thermodynamic calculations based on the addition of pure CaO to Bayan Obo iron concentrate. The results revealed that the solid solution of Ca2+ in the FeO lattice increased with the basicity of the briquettes, whereas the diffusion channels of Fe2+ ions increased during the reduction process from FeO to Fe and resulted in the formation of a great number of slender and anisotropic iron whiskers, which consequently increased the RSI. Furthermore, the melting point of the slag phase decreased as the CaO content increased; this reduced its ability to resist the reduction swelling of iron oxides. When the basicity was increased from 0.3 to 0.8, the RSI reached a maximum of 69.85%. However, due to the saturated solid solution of Ca2+ in FeO lattice, as the basicity further increased from 0.8 to 1.2, excess CaO melting into the slag phase promoted the precipitation of spinel minerals with high melting points and difficult reduction properties. Thus, the diffusion of Fe2+ and the growth of the iron whiskers were hindered, and the RSI was reduced.

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Dominant Factor Affecting Reducibility of Calcio-wüstite Originating from Silico-ferrite of Calcium and Aluminum

Cited by 2 publications

References 25 publications

Influence of Crystal Structure and Chemical Composition on the Reducibility of Silico-Ferrite of Calcium and Aluminum in CO–CO<sub>2</sub>–H<sub>2</sub>–H<sub>2</sub>O Atmosphere

Influence of Crystal Structure and Chemical Composition on the Reducibility of Silico-Ferrite of Calcium and Aluminum in CO–CO<sub>2</sub>–H<sub>2</sub>–H<sub>2</sub>O Atmosphere

Effect of basicity on the reduction swelling properties of iron ore briquettes

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