In situ x-ray diffraction investigation of the formation mechanisms of silico-ferrite of calcium and aluminium-I-type (SFCA-I-type) complex calcium ferrites

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dc.contributor.authorWebster, NASen_AU
dc.contributor.authorPownceby, MIen_AU
dc.contributor.authorMadsen, ICen_AU
dc.date.accessioned2014-10-21T01:40:55Zen_AU
dc.date.available2014-10-21T01:40:55Zen_AU
dc.date.issued2013-01-01en_AU
dc.date.statistics2014-10-21en_AU
dc.description.abstractThe formation mechanisms of the complex Ca-rich ferrite phase SFCA-I, an important bonding material in iron ore sinter, during heating of synthetic sinter mixtures in the temperature range 298-1623 K in air and at pO(2) = 5 x 10(-3) atm, were determined using in situ X-ray powder diffraction. In air, the initial formation of SFCA-I at similar to 1438 K (depending on composition) was associated with reaction of precursor phases Fe2O3, CaO center dot Fe2O3, SiO2, amorphous AI-oxide and a CFA phase of approximate composition 71.7 mass% Fe2O3, 12.9 mass% CaO, 0.3 mass% SiO2 and 15.1 mass% Al2O3. At temperatures above similar to 1453 K, the decomposition of another phase, gamma-CFF, resulted in the formation of additional SFCA-I. At lower oxygen partial pressure the initial formation of SFCA-I occurred at similar temperatures and was associated with reaction between similar phases as its formation in air. However, the decomposition of gamma-CFF did not result in the formation of additional SFCA-I, with the maximum SFCA-I concentration (25 mass%) lower than the values attained in air (54 and 34 mass%). Hence, more oxidising conditions appear to favour the formation of the desirable SFCA-I phase. Copyright © The Iron and Steel Institute of Japan 2013.en_AU
dc.identifier.citationWebster, N. A. S., Pownceby, M. I., & Madsen, I. C. (2013). In situ x-ray diffraction investigation of the formation mechanisms of silico-ferrite of calcium and aluminium-I-type (SFCA-I-type) complex calcium ferrites. ISIJ International, 53(8), 1334-1340. doi:10.2355/isijinternational.53.1334en_AU
dc.identifier.govdoc5441en_AU
dc.identifier.issn1347-5460en_AU
dc.identifier.issue8en_AU
dc.identifier.journaltitleISIJ Internationalen_AU
dc.identifier.pagination1334-1340en_AU
dc.identifier.urihttp://dx.doi.org/10.2355/isijinternational.53.1334en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5941en_AU
dc.identifier.volume53en_AU
dc.language.isoenen_AU
dc.publisherThe Iron and Steel Institute of Japanen_AU
dc.subjectIron oresen_AU
dc.subjectOresen_AU
dc.subjectDiffractionen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectCrystal structureen_AU
dc.subjectCrystalsen_AU
dc.titleIn situ x-ray diffraction investigation of the formation mechanisms of silico-ferrite of calcium and aluminium-I-type (SFCA-I-type) complex calcium ferritesen_AU
dc.typeJournal Articleen_AU
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