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

Xin, Rui-Feng; Du, Yong; Guo, Xing‐Min

doi:10.3390/ma15155257

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…An increase in the Al 2 O 3 mass% from 1.5 to about 2.0 resulted in more liquid phase generation and higher liquid phase viscosity [29][30][31]. The rise in the liquid phase led to the formation of smaller magnetite crystal particles.…”

Section: Model Significance Analysismentioning

confidence: 99%

A Quantitative and Optimization Model for Microstructure Uniformity of Sinter Based on Multiple Regression-NSGA2

Fang,

Li,

Liu

et al. 2024

Metals

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The degree of homogeneity of the sintered ore phase structure directly determines its quality index. A sinter ore quality evaluation method based on the quantification of the homogeneity of the mineral phase structure is proposed. First, the magnetite particle size characteristics in the ore phase structures with different degrees of homogeneity were summarized under a polarized light microscope, and a criterion for evaluating the uniformity of the sintered ore phase structure based on the magnetite content of different particle size grades was determined. Second, a multiple regression model was established for the raw material composition ratio of magnetite with varying particle size grades. Finally, the multiple regression model was optimized using the second-generation non-dominated sorting genetic algorithm (NSGA2). The results show that mineral phase structure analysis categorized the magnetite particle sizes into <30 μm, 30~60 μm, and >60 μm. The adjusted R2 of the multiple regression model of the chemical composition of raw materials and the proportion of magnetite of each particle size grade were all greater than 0.95, and the p values were all <0.05, indicating a high degree of model fitting. Using model analysis, the single factor and the interaction between the multiple factors that significantly influence the proportion of magnetite in the three particle size grades were determined. The multivariate regression model was optimized using the NSGA2 algorithm to determine the ratios of Al2O3 mass% = 1.82, MgO mass% = 1.50, and R(CaO mass%/SiO2 mass%) = 1.84 for the highest degree of uniformity of the sintered ores. Under this sintering condition, the micro-mineral phase structure became more homogeneous, confirming the model’s reliability.

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Section: Model Significance Analysismentioning

confidence: 99%

A Quantitative and Optimization Model for Microstructure Uniformity of Sinter Based on Multiple Regression-NSGA2

Fang,

Li,

Liu

et al. 2024

Metals

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“…In particular, the papers focus on the description of the different phases of SFCA-I and the study of their phase and chemical composition, crystalline structures, and formation conditions. In the works of Chinese scientists [24,25], correlations were found between the phase components of the agglomerate and their prop-erties based on the composition and characteristics of the concentrate. Mumme W.G.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Structure and Physicochemical Properties of the Mixed Basicity Iron Ore Sinter

Dmitriev,

Vyaznikova,

Vitkina

et al. 2023

Magnetochemistry

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To study the influence of sinter basicity on the microstructure, phase composition, and physicochemical and metallurgical properties, samples of agglomerates with different basicities were sintered and investigated. A comprehensive study of the structure, composition, chemical, and metallurgical properties of the sinter was conducted, and the optimum values for these properties were determined. The results of the mineralogical transformations that occurred during the sintering process are also presented. The magnetite contained in the concentrate partially dissolves in the silicate component and flux during agglomeration, forming a complex silicate SFCA with the general formula M14O20 (M–Ca, Si, Al, and Mg), which is the binder of the ore phases of the agglomerate. The proportion of ferrosilicates of calcium and aluminum in the sinter depends on the basicity of the sinter charge, and the morphology of the SFCA phase depends on the cooling rate of the sinter. The more CaO in the sinter charge, the more SFCA phase is formed in the sinter, and slow cooling results in the growth of large lamellar and dendritic SFCA phases.

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“…Bonding phase is the premise for the consolidation of sintered raw materials into blocks. It binds the unmelted sinter together and determines the strength and yield of sinter [4,6]. A large number of studies have shown that in the bonding phase of sinter, calcium ferrite, especially Silico-Ferrite of Calcium and Aluminum is the best, which is usually abbreviated as SFCA.…”

Section: Introductionmentioning

confidence: 99%

A Review of Calcium Ferrite in Sintering of Iron Ore and The Effect of Gangue Composition on Its Formation

Fan¹

2023

AJST

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In this paper, published studies on the bonding phase of calcium ferrite are reviewed. As the main bonding phase of high-basicity sinter, calcium ferrite has the advantages of high strength, good reducibility and easy formation of liquid phase. In particular, we emphasize the formation process of calcium ferrite phases, especially Silico-Ferrite of Calcium and Aluminum(‘SFCA’), and the influence of common gangue components (Al2O3, SiO2, MgO) on its formation. Based on the critical analysis of the current data, some deficiencies in this field are put forward and the research directions we think will be key in this field in the future are attached, so as to improve the theories related to calcium ferrite in iron ore sintering. The relevant results provide theoretical basis for understanding the formation process of calcium ferrite and producing high quality sinter.

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

Cited by 6 publications

References 29 publications

A Quantitative and Optimization Model for Microstructure Uniformity of Sinter Based on Multiple Regression-NSGA2

A Quantitative and Optimization Model for Microstructure Uniformity of Sinter Based on Multiple Regression-NSGA2

A Study of the Structure and Physicochemical Properties of the Mixed Basicity Iron Ore Sinter

A Review of Calcium Ferrite in Sintering of Iron Ore and The Effect of Gangue Composition on Its Formation

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