Effect of Alumina on Calcium Ferrites Development in the Goethite Ore Sinters

Hariswijaya, Dali; Rocha, Leonardo Tomas da; Chiwandika, Edson Kugara; Jung, Seung Boo

doi:10.1007/s40831-021-00477-6

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…In contrast to it, the amount of Fe 2 O 3 was significantly decreased, which could explain the improved interaction between solid particles and the calcium ferrite phase. The method of quantifying used in this study was previously reported by Hariswijaya et al, 56) which consisted of calculating the integral value of the peaks identified by XRD of each phase using OringPro software. The evaluation was repeated at least 3 times to ensure accuracy.…”

Section: Change In the Pore Size Distribution And Phasementioning

confidence: 99%

Effects of Adding Iron Ores-based Calcium Ferrites to the Sinter Mix on Sinter Quality and Reduction of CO2, NO and SO2

et al. 2022

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Section: Change In the Pore Size Distribution And Phasementioning

confidence: 99%

Effects of Adding Iron Ores-based Calcium Ferrites to the Sinter Mix on Sinter Quality and Reduction of CO2, NO and SO2

et al. 2022

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“…Promoting the formation of calcium ferrite in sinter has always been an important issue for decades for reducing coke ratio and ensuring the smooth operation of blast furnaces. [5][6][7][8] While, due to the stronger bonding force for CaO with SiO 2 than that for CaO with Fe 2 O 3 , the formation of calcium silicate was unavoidable in the sintering process. [9,10] Compared with calcium ferrite, the calcium silicate phases that were formed in sinter possessed relatively higher melting points (above 1450 °C) and worse reducibility.…”

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Competitive Formation Behavior of Calcium Silicate and Calcium Ferrite in Sintering of Iron Ore Fines

Du,

Wei,

Guo

2024

steel research int.

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Calcium silicate is the undesirable bonding phase in sinter with relatively high melting point and poor reducibility, while the formation mechanism in sinter is ambiguous. Herein, the phase transformation, phase quantification, and morphology evolution of calcium silicate and calcium ferrite in CaO‐SiO2‐Fe2O3‐Al2O3 systems under different n(Fe2O3)/n(CaO) and Al2O3 content are investigated. It is found that with the increase of n(Fe2O3)/n(CaO), the calcium ferrite phases transform from Ca2Fe2O5 (C2F) to complex calcium ferrite, and calcium silicate phases including β‐Ca2SiO4 (β‐C2S) and γ‐Ca2SiO4 (γ‐C2S) are promoted. Moreover, small amount (2%) of Al2O3 can effectively promote the content of silico‐ferrite of calcium and aluminum (SFCA) increasing from 20.95% to 46.69%, whereas inhibiting the β‐C2S from 51.79% to 42.34%. When the content of Al2O3 is over 4%, the Ca2Al(AlSiO7) phase is formed, where both the SFCA and calcium silicate are inhibited. On this base, the competitive mechanism for the formation of calcium silicate and calcium ferrite is revealed, where the Ca2+ and Si4+ are preferred to react with Fe3+ and Al3+ to form liquid phase SFCA, while the amount for β‐C2S or γ‐C2S can be decreased due to the deprivation of Ca2+ and Si4+.

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Effects of Recycling By-Products as Calcium Ferrites Added to the Sinter Mix on Sinter Quality and Emission of CO2, NO, and SO2

Rocha

Cho

Kim

et al. 2022

Metall Mater Trans B

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Effect of Alumina on Calcium Ferrites Development in the Goethite Ore Sinters

Cited by 3 publications

References 18 publications

Effects of Adding Iron Ores-based Calcium Ferrites to the Sinter Mix on Sinter Quality and Reduction of CO<sub>2</sub>, NO and SO<sub>2</sub>

Effects of Adding Iron Ores-based Calcium Ferrites to the Sinter Mix on Sinter Quality and Reduction of CO<sub>2</sub>, NO and SO<sub>2</sub>

Competitive Formation Behavior of Calcium Silicate and Calcium Ferrite in Sintering of Iron Ore Fines

Effects of Recycling By-Products as Calcium Ferrites Added to the Sinter Mix on Sinter Quality and Emission of CO2, NO, and SO2

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