Microstructure Evolution During Controlled Solidification of “Fe2O3”-CaO-SiO2 Liquids in Air

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

doi:10.1007/s11663-019-01687-w

Cited by 13 publications

(44 citation statements)

References 19 publications

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“…Details of the experimental technique used in this study have been reported in a previous publication by the authors. 2) The technique enables each stage of the solidification process to be identified and differentiated from the processes occurring during heating. The ability to rapidly quench the sample and to accurately capture the microstructures and phase compositions present at temperature are critical to the experimental design.…”

Section: Experimental Techniquementioning

confidence: 99%

“…Assemblage II is additive to Assemblage I, with new microstructures forming on the existing solids. 2) Analysis of the liquid compositions present in the later stages of Assemblage I shows that the melt is undercooled with respect to C 2 S. Once nucleated, the C 2 S rapidly solidifies due to the supercooling, with a C 2 S layer (IIa) forming on the hematite followed by individual C 2 S crystals (IIb). Due to the rapid solidification of C 2 S, moving the liquid composition directly away from the C 2 S composition and towards the C 2 S-SFC boundary line.…”

Section: Formation Of Assemblage II (L + C 2 S + H)mentioning

confidence: 99%

“…It has been postulated that the different iron oxide morphologies and phase associations result in different sinter properties. 1) A series of studies have been undertaken to determine the stages and phase assemblages occurring during the solidification of "Fe 2 O 3 "-CaO-SiO 2 melts 2,3) and the effects of cooling rate on the phases formed and the resulting microstructures on solidification of these melts. 4) In the present study, a systematic investigation of the effects of changing bulk Fe 2 O 3 concentration, independent of other controllable parameters, on the microstructures and phases formed on cooling "Fe 2 O 3 "-CaO-SiO 2 melts at conditions relevant to iron ore sintering is described.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Bulk Fe2O3 Concentration on the Controlled Solidification of “Fe2O3”–CaO–SiO2 Liquids in Air

2020

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The solidification of "Fe 2 O 3 "-CaO-SiO 2 liquids in air at a controlled cooling rate of 2.0 K/s for a range of Fe 2 O 3 concentrations in the bulk has been investigated. The compositions investigated were selected such that the bulk compositions were within the hematite primary phase field and had a CaO/SiO 2 ratio of 3.46 wt/wt.Non-equilibrium phase assemblages were formed for all bulk compositions investigated. Specifically, the silico ferrite of calcium (SFC) phase was not formed on cooling. The microstructures and proportions of the phase assemblages formed were found to vary with the Fe 2 O 3 concentration in the bulk.

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Section: Experimental Techniquementioning

confidence: 99%

Section: Formation Of Assemblage II (L + C 2 S + H)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of the Bulk Fe2O3 Concentration on the Controlled Solidification of “Fe2O3”–CaO–SiO2 Liquids in Air

2020

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“…On reaching the target temperature, the samples were released and fell under gravity into water, the quenching medium. Further details of the experimental apparatus are provided elsewhere [11].…”

Section: Laboratory Scale Testsmentioning

confidence: 99%

Measurement of Process Conditions Present in Pilot Scale Iron Ore Sintering

Nicol

Chen

et al. 2019

Minerals

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An improved experimental technique has been developed to measure, concurrently, the oxygen partial pressures and temperatures within a pilot scale iron ore sinter pot as a function of time. The measurements and thermodynamic calculations have demonstrated that the oxygen partial pressure at peak bed temperature and during cooling can be oxidising or reducing relative to hematite. Examples of typical microstructures and phase assemblages observed in product sinters are presented. Potential mechanisms of hematite and magnetite formation at sub-liquidus and sub-solidus conditions are demonstrated. The relative impacts of changes to coke rate and draft pressure drop on the process conditions and proportions of the phases formed in the sinter have been measured. Increasing coke rate was shown to result in a faster sinter heating rates, higher peak bed temperatures and times at peak temperature. Higher draft pressures across the sinter bed resulted in faster sinter heating rates and shorter times at peak temperature.

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“…Especially, calcium-ferrite-based materials are sensitive to several factors such as the composition, [29][30][31][32][33][34][35][36] thermal history, [37] and gas atmosphere. [18,38,39] Therefore, it is important to control the factors and analyze the samples exactly.…”

Section: Introductionmentioning

confidence: 99%

Effects of Basicity and Al2O3 Content on the Chemistry of Phases in Iron Ore Sinter Containing ZnO

Park

Ramaraghavulu

Suh

et al. 2020

Metall Mater Trans B

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The effects of basicity and Al 2 O 3 content on the chemistry of phases in iron ore sinter containing ZnO were investigated by Rietveld analysis of the X-ray diffraction (XRD) patterns. Bulk composition analysis was carried out using inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and wet-chemical analysis. The composition of each phase was investigated using a scanning electron microscope-energy dispersive X-ray analyzer (SEM-EDX). It was found that ZnO exists in the franklinite and the silicoferrite of calcium and aluminum (SFCA) phases. With increasing ZnO content, the phase fraction of the franklinite increased, while the fraction of SFCA slightly increased. When ZnO content was fixed at 1 wt pct and basicity increased, the fraction of franklinite decreased and that of SFCA increased. Here, the solubility of ZnO in the SFCA increased. As the Al 2 O 3 content increased, the fraction of franklinite decreased and that of SFCA increased, while ZnO content in the SFCA did not change significantly.

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Microstructure Evolution During Controlled Solidification of “Fe2O3”-CaO-SiO2 Liquids in Air

Cited by 13 publications

References 19 publications

Effects of the Bulk Fe<sub>2</sub>O<sub>3</sub> Concentration on the Controlled Solidification of “Fe<sub>2</sub>O<sub>3</sub>”–CaO–SiO<sub>2</sub> Liquids in Air

Effects of the Bulk Fe<sub>2</sub>O<sub>3</sub> Concentration on the Controlled Solidification of “Fe<sub>2</sub>O<sub>3</sub>”–CaO–SiO<sub>2</sub> Liquids in Air

Measurement of Process Conditions Present in Pilot Scale Iron Ore Sintering

Effects of Basicity and Al2O3 Content on the Chemistry of Phases in Iron Ore Sinter Containing ZnO

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