Silico-ferrite of Calcium and Aluminum Characterization by Crystal Morphology in Iron Ore Sinter Microstructure

Mežibrický, Roland; Fröhlichová, Mária

doi:10.2355/isijinternational.isijint-2016-044

Cited by 15 publications

(19 citation statements)

References 18 publications

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“…It has been assumed that prismatic and platy SFCA correspond to SFCA and SFCA-I, respectively, but based on this evidence, it appears that PC is under-representing the proportion of SFCA-I present. Traditionally, morphologies are used to distinguish these two variants when using optical-based techniques; however, recent work by Mezibricky and Frolichova [5] has demonstrated that using a morphological approach to distinguish between SFCA and SFCA-I types is problematic since both phases can exhibit similar textures.…”

Section: As Shown Inmentioning

confidence: 99%

“…Murao et al [27] determined thermodynamic stability for SFCA, and this range is reproduced in Figure 6. Less work has been reported for SFCA-I; however, many authors have reported a difference in the chemical composition of SFCA and SFCA-I [3,5,7,28]. Selected results are plotted in Figure 6 for comparison.…”

Section: Semmentioning

confidence: 99%

“…SFCA-I and SFCA are stable in discrete compositional ranges and have distinct crystallographic structures, which are presumed to correspond to the platy and prismatic morphologies observed using reflected light microscopy, respectively. However, recent work by Mezibricky and Frolichova [5] has demonstrated that using a morphological approach to distinguishing between SFCA and SFCA-I types is problematic since both phases can exhibit similar textures.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the Mineralogy of Iron Ore Sinters Using a Range of Techniques

et al. 2019

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Many different approaches have been used in the past to characterise iron ore sinter mineralogy to predict sinter quality and elucidate the impacts of iron ore characteristics and process variables on the mechanisms of sintering. This paper compares the mineralogy of three sinter samples with binary basicities (mass ratio of CaO/SiO 2 ) between 1.7 and 2.0. The measurement techniques used were optical image analysis and point counting (PC), quantitative X-ray diffraction (QXRD) and two different scanning electron microscopy systems, namely, Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN) and TESCAN Integrated Mineral Analyser (TIMA). Each technique has its advantages and disadvantages depending on the objectives of the measurement, with the quantification of crystalline phases, textural relationships between minerals and chemical compositions of the phases covered by the combined results. Some key differences were found between QXRD and the microscopy techniques. QXRD results imply that not all of the silico-ferrite of calcium and aluminium (SFCA types) are being identified on the basis of morphology in the microscopy results. The amorphous concentration determined by QXRD was higher than the glass content identified in the microscopy results, whereas the magnetite and total SFCA concentration was lower. The scanning electron microscopy techniques were able to provide chemical analysis of the phases; however, exact correspondence with textural types was not always possible and future work is required in this area, particularly for differentiation of SFCA and SFCA-I phases. The results from the various techniques are compared and the relationships between the measurement results are discussed.

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Section: As Shown Inmentioning

confidence: 99%

Section: Semmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of the Mineralogy of Iron Ore Sinters Using a Range of Techniques

et al. 2019

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“…The objective of the synthesis was to prepare pure prismatic SFCA crystals, i.e., without any intergrowing SFCA-I crystals, which would make the evaluation of indentation erroneous. It is known from the literature that SFCA-I does not crystalize from the melt [26,27]. Thus, to prevent the formation of SFCA-I, the thermal treatment was chosen to ensure complete melting of the ferrites which had formed through solid-state reactions during the early stages of the experiment.…”

Section: Mixturementioning

confidence: 99%

Synthesis and Mechanical Testing of Calcium Aluminosilicoferrite Crystals with High Alumina Content

Mežibrický

Csanádi

Habler

et al. 2019

Metals

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Due to the gradual shift to less rich iron ores, the alumina content in the raw materials used for iron-making is progressively increasing, affecting the mineralogy and the properties of iron ore sinters. In this context, the effect of Al content on the mechanical properties of calcium aluminosilicoferrites Ca2(Ca,Mg,Fe)6(Fe,Si,Al)6O20 (SFCA), which is the most important bonding phase in iron ore sinters, is of particular interest. In this study, high-alumina calcium aluminosilicoferrites were synthesized and their mechanical properties were determined by nanoindentation using a cube-corner indenter. For synthesis, different raw materials were taken as proxies for the adhering layer in a sinter granule. Three mixtures were prepared, high-iron, high-silica, and high-alumina and heated in an alumina crucible, which was used to simulate the high-alumina nucleus in a granule. The different raw materials used for synthesis had only minor influence on the compositions of the synthesized ferrites. All ferrites showed similar mechanical behavior during indentation, indicating that neither the chemical nor the mechanical properties were affected by the different compositions of the adhering layer, when the sinter granule is dominated by a high-alumina nucleus. The crystallographic orientation of the tested grains had only minor influence on the results of the nanoindentation experiments.

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“…Nowadays, the research in the field of iron ore sinter mineralogy is concentrated on one group of the bonding phases -complex calcium ferrites (designated as SFCA, an acronym for silicoferrite of calcium and aluminum), which accumulate besides Fe2O3 and CaO also SiO2, Al2O3 and other minority components [3][4][5]. In industrially produced sinters, there are 2 types of SFCA-s according to the chemical composition: low-Fe SFCA and high-Fe SFCA-I [6]. Before advanced study of SFCA/SFCA-I, calcium ferrites CaFe4O7 and CaFe3O5 were considered as the main ferrite phases in lime-fluxed iron ore sinters [7,8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Iron Ore Sinter Mineralogy Quantification

Mežibrický

Fröhlichová

2017

Acta Metall Slovaca

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At present, the powder XRD is widely used analytical method for iron ore sinter mineralogy determination. In many types of research, diffraction data for SFCA and SFCA-I phases were not available, and diffraction data for other calcium ferrites were used instead. Therefore, the aim of this paper is to bring a comparison between the evaluation of diffractograms, when SFCA/SFCA-I, and, other calcium ferrites, respectively, are considered. As a result, the quantification of phases is quite comparable, when minerals are collected into groups, i.e. hematite, magnetite, calcium ferrites, silicates and non-assimilated non-ferrous phases. Only in the case of silicates, a comparison tends to be dissatisfactory.

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Silico-ferrite of Calcium and Aluminum Characterization by Crystal Morphology in Iron Ore Sinter Microstructure

Cited by 15 publications

References 18 publications

Comparison of the Mineralogy of Iron Ore Sinters Using a Range of Techniques

Comparison of the Mineralogy of Iron Ore Sinters Using a Range of Techniques

Synthesis and Mechanical Testing of Calcium Aluminosilicoferrite Crystals with High Alumina Content

Comparison of Iron Ore Sinter Mineralogy Quantification

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