Mechanisms of Phase and Microstructure Formation during the Cooling of “Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;”–CaO–SiO&lt;sub&gt;2&lt;/sub&gt;–Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Melts in Air and Implications for Iron Ore Sintering

Nicol, Stuart; Cheng, Siyu; Jak, Evgueni; Hayes, Peter C.

doi:10.2355/isijinternational.isijint-2020-182

Cited by 12 publications

(20 citation statements)

References 26 publications

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“…In the past several decades, the properties of Crbearing and Ti-bearing slags have been widely investigated. [23][24][25][26][27][28][29][30][31][32][33] Qiu et al 23 studied the viscosity of titanium-containing slag and discovered that the slag viscosity increased significantly with increasing Cr 2 O 3 content, and Jiao et al 28 investigated the change in the viscosity of the CaO-MgO-Al 2 O 3 -SiO 2 -TiO 2 slag with different TiO 2 contents. Nicol et al 32 studied the controlled solidification of iron oxiderich melts in the ''Fe 2 O 3 ''-CaO-SiO 2 -Al 2 O 3 system in air.…”

Section: Introductionmentioning

confidence: 99%

“…[23][24][25][26][27][28][29][30][31][32][33] Qiu et al 23 studied the viscosity of titanium-containing slag and discovered that the slag viscosity increased significantly with increasing Cr 2 O 3 content, and Jiao et al 28 investigated the change in the viscosity of the CaO-MgO-Al 2 O 3 -SiO 2 -TiO 2 slag with different TiO 2 contents. Nicol et al 32 studied the controlled solidification of iron oxiderich melts in the ''Fe 2 O 3 ''-CaO-SiO 2 -Al 2 O 3 system in air. However, the TiO 2 content of the slags examined in these studies was low (<30%), while investigations of the viscosity and crystallization process of Cr-bearing high titanium slag, and in particular with greater than 40% TiO 2 have been rare.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Al2O3 on the Viscosity and Crystallization Behavior of CaO-SiO2-MgO-Al2O3-TiO2-Cr2O3 Slag

et al. 2021

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The viscosity and crystallization behavior of CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2 -Cr 2 O 3 slag with different Al 2 O 3 contents have been investigated by FactSage thermodynamic calculations, melting point and melting rate measurements, viscosity measurements, phase composition, and microscopy analysis. Fact-Sage thermodynamics calculations revealed that with increasing Al 2 O 3 content, the contents of crystallized spinel, perovskite, and anosovite gradually increased, while the contents of sphene and clinopyroxene decreased. The increase in the Al 2 O 3 content increased the softening, hemispherical, and flowing temperatures. The composition and microstructure of the crystallized phase were assessed using x-ray diffraction and scanning electron microscopy. The results indicated that with the increase of Al 2 O 3 content, the peak intensities of the spinel phase with a high melting point increased. Furthermore, a greater amount of the spinel phase crystallized, explaining the observed increase in the viscosity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Al2O3 on the Viscosity and Crystallization Behavior of CaO-SiO2-MgO-Al2O3-TiO2-Cr2O3 Slag

et al. 2021

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“…Only a few studies have been conducted on the mineral composition and structure of sintered ore with respect to the cooling regime. 25,26) The mineral structure of sintered ore is closely related to its cooling process. Thus, clarifying the mineral evolution trends in the cooling stage of the iron ore sintering process and studying the influence of the cooling system on the composition and structure of the sintered ore phase are important to improve the quality of sinters.…”

Section: Mineralization Characteristics Of Iron Ore Sinter and The Ef...mentioning

confidence: 99%

“…In the air atmosphere, the CaO-Fe 2 O 3 -SiO 2 system above 1 256°C underwent the L + M → L + H reaction, 26) which mainly involved oxidation of magnetite into sec-ondary hematite. First, the oxygen in the air reacted at the junction of the liquid phase to form O 2 − in the liquid phase.…”

Section: Mechanism Of Mineral Phase Transformation During the Cooling...mentioning

confidence: 99%

Mineralization Characteristics of Iron Ore Sinter and the Effects of Cooling Rate on Mineral Phase Structure

et al. 2023

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The mineral phase composition and structure of sintered ore are closely related to its quality. Analyzing the characteristics of the phase structure of sintered ores and studying the influence of sintering conditions are important to optimize their quality. In this study, the mineralization characteristics of ore during the sintering process were studied through interrupted quenching experiments. The results clarified the evolution of the structure of the sintered ore phases during the heating and cooling and its mechanism. In this study, the effects of the cooling rate on the mineral composition and structure of sintered ore were also studied. The results showed that the structure of the mineral phase changed during the iron ore sintering process as follows: granular → molten → dissolution texture. During the cooling process, as the temperature decreased, the magnetite and liquid phase contents gradually decreased, and the silico-ferrite of calcium and aluminum (SFCA) and hematite contents increased; however, the porosity did not change to a great extent. The formation of SFCA during the cooling stage consumed hematite and magnetite, and SFCA preferentially formed and grew on magnetite. As the cooling rate of the sinter was increased, the magnetite and silicate contents increased, and the hematite and SFCA contents decreased. Meanwhile, the structure of SFCA changed from block-like to columnar and acicular, and the aspect ratio increased.

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“…[30][31][32] The formation characteristics of SFCA is mainly dominated by the factors such as the chemical compositions of iron ores, sinter basicity, gas atmosphere and cooling rate. [33][34][35][36][37] Normally, the higher sinter basicity, iron grade and SiO 2 content of iron ores and oxygen partial pressure contribute to the formation of SFCA while the excessive Al 2 O 3 and MgO contents of iron ores and overquick cooling rate during sintering are adverse to the formation of SFCA. In general, SFCA can be divided into two types on the basis of the composition, morphology and crystal structure, i.e.…”

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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Mechanisms of Phase and Microstructure Formation during the Cooling of “Fe<sub>2</sub>O<sub>3</sub>”–CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Melts in Air and Implications for Iron Ore Sintering

Cited by 12 publications

References 26 publications

Effect of Al2O3 on the Viscosity and Crystallization Behavior of CaO-SiO2-MgO-Al2O3-TiO2-Cr2O3 Slag

Effect of Al2O3 on the Viscosity and Crystallization Behavior of CaO-SiO2-MgO-Al2O3-TiO2-Cr2O3 Slag

Mineralization Characteristics of Iron Ore Sinter and the Effects of Cooling Rate on Mineral Phase Structure

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

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