Effect of SiO2 on the Formation of Acicular Calcium Ferrite in Sinter

Wang, Wei; Yang, Daiwei; Ouyang, Zhijun; Xu, Runsheng; Song, Mingming

doi:10.1007/s11663-019-01528-w

Cited by 22 publications

(8 citation statements)

References 16 publications

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“…The result indicated the antiferromagnetic phase was the most stable among three phases, which was same to the calculated results by Das et al with U = 4.0 eV. 34) In addition, Wang et al 35,36) calculated the surface energies of (040), (320), (201) and (401) surfaces, and they found the (401) surface had the lowest energy. However, the Hubbard parameter and the antiferromagnetic were not considered in the calculation process.…”

Section: Surface Structures Of Cafe 2 O 4 (001) (100) (110) and (11supporting

confidence: 76%

“…The method was also used to compare the relative stability of the low-index surfaces of LiFePO 4 , α-Bi 2 O 3 and VO 2 by Wang et al, 55) Lei et al 56) and Mellan et al, 57) respectively. Moreover, Wang et al 35) also observed the preferred orientation of the crystal for CaFe 2 O 4 had the (100) surface by TEM.…”

Section: Cafe 2 O 4 (111) Surface Termination and Stabilitymentioning

confidence: 91%

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Surface Structures of CaFe2O4 (001), (100), (110) and (111): A Density Functional Theory Study

Que

2021

ISIJ Int.

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Section: Surface Structures Of Cafe 2 O 4 (001) (100) (110) and (11supporting

confidence: 76%

Section: Cafe 2 O 4 (111) Surface Termination and Stabilitymentioning

confidence: 91%

Surface Structures of CaFe2O4 (001), (100), (110) and (111): A Density Functional Theory Study

Que

2021

ISIJ Int.

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“…The sample was compressed into a cylindrical shape (Ø 20 × 20 mm) and sintered in a platinum crucible. From the previous research [ 25 , 26 , 27 ] it was found that if the sample was held above the TL for 2 h, a molten equilibrium liquid phase would be formed.…”

Section: Methodsmentioning

confidence: 99%

Effect of Alumina on Crystallization Behavior of Calcium Ferrite in Fe2O3-CaO-SiO2-Al2O3 System

Xin

Guo

2022

Materials

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Al2O3 is a gangue component in iron ores, significantly influencing the formation and crystallization of calcium ferrite in the sintering process. But the mechanism of the Al2O3 effect on the crystallization of calcium ferrite is rarely reported. In this work, a crystallization device was designed to investigate the crystallization behavior of calcium ferrite in Fe2O3-CaO-SiO2-Al2O3 melt under non-isothermal conditions. XRD, SEM-EDS, and optical microscopy were used to identify the crystalline phase and the microstructure of samples. The result shows that the crystal morphology of SFCA changed in the order of strip, column, and needle as the Al2O3 content increased. The crystallization sequence of samples containing Al2O3 was observed as Ca4Fe14O25 (C4F14) → Fe2O3 →Ca3.18Fe15.48Al1.34O36 (SFCA-I) → CaFe2O4 (CF) → Ca5Si2(Fe, Al)18O36 (SFCA) → γ-Ca2SiO4 (C2S). The generation pathway of SFCA-I was found to be C4F14 + Si4+ + Al3+ → SFCA-I. Increasing the cooling rate can promote the formation of C4F14, SFCA-I, Fe2O3 and the amorphous phase. However, it prevented the crystallization of CF and SFCA while inhibiting the transformation of β-C2S to γ-C2S. When the Al2O3 content reached or exceeded 2.5 mass pct, the viscosity of Fe2O3-CaO-SiO2-Al2O3 melt increased sharply, resulting in the decrease in the crystal size of calcium ferrite.

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“…high-iron SFCA and low-iron SFCA. [38][39][40][41][42] The former possesses relatively higher mechanical strength and lower formation temperature compared with the latter. Thus, the more formation of high-iron SFCA is more beneficial to the improvement of sinter strength.…”

Section: Strength Of Bonding Matrixmentioning

confidence: 99%

Distinct Difference in High-temperature Characteristics between Limonitic Nickel Laterite and Ordinary Limonite

et al. 2022

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In order to achieve the effective utilization of limonitic nickel laterite for stainless steel production at lower cost, the distinct difference in high-temperature characteristics between limonitic nickel laterite and ordinary limonite has been systematically expounded via compact sintering method and the comparative analysis of the relevant sintering performance at the suitable basicity has also been conducted through sinter pot tests. The results indicate that limonitic nickel laterite possesses much poorer assimilability and liquid phase fluidity due to the abundant high-smelting minerals compared with ordinary limonite. The strength of bonding matrix of limonitic nickel laterite is relatively better as the basicity is not exceed 1.4 while that of ordinary limonite is maintained at a higher level with the basicity of no less than 1.8. Meanwhile, the former is far weaker than the latter due to the much less amount of liquid phase, rather higher porosity and looser microstructure of the bonding matrix. Limonitic nickel laterite is identified as a far more refractory ore for sintering compared with ordinary limonite, further supported by sinter pot tests. It is essential to strengthen limonitic nickel laterite sintering from the standpoints of how to promote the liquid phase formation and densification of the sinter.

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Effect of SiO2 on the Formation of Acicular Calcium Ferrite in Sinter

Cited by 22 publications

References 16 publications

Surface Structures of CaFe<sub>2</sub>O<sub>4</sub> (001), (100), (110) and (111): A Density Functional Theory Study

Surface Structures of CaFe<sub>2</sub>O<sub>4</sub> (001), (100), (110) and (111): A Density Functional Theory Study

Effect of Alumina on Crystallization Behavior of Calcium Ferrite in Fe2O3-CaO-SiO2-Al2O3 System

Distinct Difference in High-temperature Characteristics between Limonitic Nickel Laterite and Ordinary Limonite

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