A Short Review of the Effect of Iron Ore Selection on Mineral Phases of Iron Ore Sinter

Park, Jun‐Woo; Kim, Eunju; Suh, In-kook

doi:10.3390/min12010035

Cited by 10 publications

(2 citation statements)

References 57 publications

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“…Sinter is a process of using low-grade iron ore to create high-quality manufactured iron ore, which is widely used in blast furnace ironmaking, and its quality directly determines the cost and efficiency of blast furnace production [1][2][3][4]. Its quality is closely related to microscopic mineral composition and mineral phase structure characteristics [5][6][7]. Therefore, it is of practical significance to analyze the mineral composition and internal structure of sinter to improve its quality.…”

Section: Introductionmentioning

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: Introductionmentioning

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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show abstract

“…Despite numerous studies dedicated to the investigation of iron ore sinter, there is a need for further research on its structure and physicochemical properties, taking into account the characteristics of mixed basicity compositions [2][3][4][5][6][7][8][9]. Analyzing the data obtained from studying the structure of mixed iron ore sinter will provide a better understanding of the mechanisms involved in its formation and optimize the sintering process.…”

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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Reduction of Basic Iron Ore Sinter under Blast Furnace Wall and Center‐Simulated Conditions in CO–CO₂–H₂–H₂O–N₂ Gas

Abdelrahim,

Iljana,

Aula

et al. 2024

steel research int.

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This study examines how varying conditions at the center and wall of a blast furnace (BF) impact the reduction of iron ore sinter in a gas containing hydrogen and water vapor. Sinter samples are isothermally reduced at 700–1100 °C using a BF simulator to assess reduction rates and extent. Characterization techniques analyze the reduced samples’ mineralogical, physical, and microstructural changes. Results indicate that metallic iron formed at 700 °C in samples reduced under BF center conditions but is absent up to 900 °C in BF wall conditions. Metallic iron is initially formed at the periphery and propagated inward as temperature increased. The sinter's non‐homogeneous structure hinders uniform gas diffusion, with unfused iron ore content obstructing reducibility. The skeletal density of reduced samples correlated with the degree of reduction. The reduction of magnetite to metallic iron through wüstite is observed. Wüstite reducibility was better than calcium ferrite. No carbon deposition is observed in all testing conditions. Comparisons to acid iron ore pellets suggest charging the sinter to the BF center and pellets to the wall, with a recommendation to minimize unfused iron ore in the sinter charge for improved reducibility.

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A Short Review of the Effect of Iron Ore Selection on Mineral Phases of Iron Ore Sinter

Cited by 10 publications

References 57 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

Reduction of Basic Iron Ore Sinter under Blast Furnace Wall and Center‐Simulated Conditions in CO–CO₂–H₂–H₂O–N₂ Gas

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A Short Review of the Effect of Iron Ore Selection on Mineral Phases of Iron Ore Sinter

Cited by 10 publications

References 57 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

Reduction of Basic Iron Ore Sinter under Blast Furnace Wall and Center‐Simulated Conditions in CO–CO2–H2–H2O–N2 Gas

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Reduction of Basic Iron Ore Sinter under Blast Furnace Wall and Center‐Simulated Conditions in CO–CO₂–H₂–H₂O–N₂ Gas