The Role of Basicity in the Formation of the Structure and Properties of Iron Ore Agglomerates

Dmitriev, Andrey N.; Vyaznikova, Elena A.; Vitkina, Galina Yu.; Alektorov, Roman V.; Шубин, А. Б.

doi:10.4028/www.scientific.net/ddf.413.201

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…The Institute of metallurgy of the Ural Branch of the Russian Academy of sciences has developed a methodology for evaluating the influence of quality indicators of iron ore raw materials on the technical and economic indicators of blast furnace smelting [6][7][8][9][10]. The following metallurgical characteristics of laboratory agglomerates -mechanical strength, abrasion resistance, thermomechanical strength (LTD+6.3) -were determined according to the Russian State Standard 15137-87 and ISO 13930 within the developed methodology.…”

Section: Study Of Strength Characteristics Of Laboratory Agglomerates...mentioning

confidence: 99%

Study of the Strength Characteristics of Agglomerate Depending on its Structure and Phase Composition

Dmitriev

Vyaznikova

Vitkina

et al. 2022

DDF

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Strength characteristics of iron ore agglomerates of various basicity (mechanical strength and abrasion resistance, thermomechanical strength) have been investigated. The chemical and phase compositions of iron ore agglomerates, their microstructure and local chemical composition were analyzed. Dependences of the strength characteristics of iron ore agglomerates of various basicity on the morphology of silicate bond have been obtained. Dependences of influence of basicity of iron ore agglomerates on their strength characteristics depending on the proportion of phase components are obtained. It has been shown that an increase in the proportion of stabilized silicoferrite (SFCA) in the composition of agglomerates has a positive effect on their thermomechanical strength, which will increase the productivity of the blast furnace and significantly reduce the emission of dust.

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Section: Study Of Strength Characteristics Of Laboratory Agglomerates...mentioning

confidence: 99%

Study of the Strength Characteristics of Agglomerate Depending on its Structure and Phase Composition

Dmitriev

Vyaznikova

Vitkina

et al. 2022

DDF

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“…Numerous studies have been carried out to investigate changes in the phase composition of sinter under different conditions [27][28][29][30][31][32][33] to determine the compositional range, phase stability, crystal structure, and mechanism of SFCA formation and their influence on the metallurgical properties of the sinter. However, at both the fundamental and practical levels, the knowledge gained is disparate and individual.…”

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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Investigation of forming of structural components of iron ore sinter of different basicity under heating

VYAZNIKOVA,

Dmitriev,

Vit’kina

et al. 2023

Černaâ metallurgiâ. Bûlletenʹ naučno-tehničeskoj informacii

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A high-quality iron ore sinter must have sufficient mechanical strength both in the cold and hot state. Structural components such as the binding phases of calcium and aluminum silicoferrites SFCA and modifications of dicalcium silicate directly affect the strength characteristics of the sinter. During phase transitions, the volume of phases changes, which leads to the occurrence of stresses at the phase boundaries. Then stabilized phases of SFCA are key bundles in the iron ore sinter. Understanding the mechanisms of SFCA formation can lead to an increase in the efficiency of sintering process. The phase transformations occurring in sinter with a basicity of 1.2‒2.0 under controlled heating in an inert atmosphere and an air atmosphere are investigated. The temperatures of phase transitions during heating are shown. The study of the phase composition of sinter samples with different basicities showed that the ore phase consists of magnetite Fe3O4, hematite Fe2O3, calcium and aluminum silicoferrite SFCA and dicalcium silicate modifications α-2CaO•SiO2 and β-2CaO•SiO2. With an increase in the basicity of the sinter, the amount of magnetite and SFCA increases, the amount of hematite decreases, the content of α- and β-2CaO•SiO2 increases slightly. Heating of the sinter in the air atmosphere leads to the oxidation of magnetite to hematite, a decrease in the amount of SFCA, an increase in bicalcium and the appearance of tricalcium silicate. Heating in an inert atmosphere contributes to an increase in the amount of magnetite due to the reduction of hematite and the decomposition of the SFCA phase and an increase in the amount of dicalcium silicate.

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The Role of Basicity in the Formation of the Structure and Properties of Iron Ore Agglomerates

Cited by 3 publications

References 11 publications

Study of the Strength Characteristics of Agglomerate Depending on its Structure and Phase Composition

Study of the Strength Characteristics of Agglomerate Depending on its Structure and Phase Composition

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

Investigation of forming of structural components of iron ore sinter of different basicity under heating

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