Silico-ferrite of calcium and aluminum (SFCA) iron ore sinter bonding phases: new insights into their formation during heating and cooling

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dc.contributor.authorWebster, NASen_AU
dc.contributor.authorPownceby, MIen_AU
dc.contributor.authorMadsen, ICen_AU
dc.contributor.authorKimpton, JAen_AU
dc.date.accessioned2014-05-19T03:58:42Zen_AU
dc.date.available2014-05-19T03:58:42Zen_AU
dc.date.issued2012-12-01en_AU
dc.date.statistics2014-05-19en_AU
dc.description.abstractThe formation of silico-ferrite of calcium and aluminum (SFCA) and SFCA-I iron ore sinter phases during heating and cooling of synthetic iron ore sinter mixtures in the range 298 K to 1623 K (25 A degrees C to 1350 A degrees C) and at oxygen partial pressure of 5 x 10(-3) atm has been characterized using in situ synchrotron X-ray diffraction. SFCA and SFCA-I are the key bonding phases in iron ore sinter, and an improved understanding of their formation mechanisms may lead to improved efficiency of industrial sintering processes. During heating, SFCA-I formation at 1327 K to 1392 K (1054 A degrees C to 1119 A degrees C) (depending on composition) was associated with the reaction of Fe2O3, 2CaO center dot Fe2O3, and SiO2. SFCA formation (1380 K to 1437 K [1107 A degrees C to 1164 A degrees C]) was associated with the reaction of CaO center dot Fe2O3, SiO2, and a phase with average composition 49.60, 9.09, 0.14, 7.93, and 32.15 wt pct Fe, Ca, Si, Al, and O, respectively. Increasing Al2O3 concentration in the starting sinter mixture increased the temperature range over which SFCA-I was stable before the formation of SFCA, and it stabilized SFCA to a higher temperature before it melted to form a Fe3O4 + melt phase assemblage (1486 K to 1581 K [1213 A degrees C to 1308 A degrees C]). During cooling, the first phase to crystallize from the melt (1452 K to 1561 K [1179 A degrees C to 1288 A degrees C]) was an Fe-rich phase, similar in composition to SFCA-I, and it had an average composition 58.88, 6.89, 0.82, 3.00, and 31.68 wt pct Fe, Ca, Si, Al, and O, respectively. At lower temperatures (1418 K to 1543 K [1145 A degrees C to 1270 A degrees C]), this phase reacted with melt to form SFCA. Increasing Al2O3 increased the temperature at which crystallization of the Fe-rich phase occurred, increased the temperature at which crystallization of SFCA occurred, and suppressed the formation of Fe2O3 (1358 K to 1418 K [1085 A degrees C to 1145 A degrees C]) to lower temperatures. © 2012, Springer Natureen_AU
dc.identifier.citationWebster, N. A. S., Pownceby, M. I., Madsen, I. C., & Kimpton, J. A. (2012). Silico-ferrite of calcium and aluminum (SFCA) iron ore sinter bonding phases: new insights into their formation during heating and cooling. Metallurgical and Materials Transactions B, 43B, 1344-1357.en_AU
dc.identifier.govdoc5142en_AU
dc.identifier.issn1073-5615en_AU
dc.identifier.journaltitleMetallurgical and Materials Transactions Ben_AU
dc.identifier.pagination1344-1357en_AU
dc.identifier.urihttp://dx.doi.org/10.1007/s11663-012-9740-5en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5600en_AU
dc.identifier.volume43Ben_AU
dc.language.isoenen_AU
dc.publisherSpringer natureen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectDecompositionen_AU
dc.subjectDiffractionen_AU
dc.subjectCrystal structureen_AU
dc.subjectSolid solutionsen_AU
dc.subjectTemperature dependenceen_AU
dc.titleSilico-ferrite of calcium and aluminum (SFCA) iron ore sinter bonding phases: new insights into their formation during heating and coolingen_AU
dc.typeJournal Articleen_AU
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