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Fundamentals of Silico-Ferrite of Calcium and Aluminum (SFCA) and SFCA-I Iron Ore Sinter Bonding Phase Formation: Effects of MgO on Phase Formation During Heating

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Abstract

The effect of MgO on the stability, concentrations and formation mechanisms of silico-ferrite of calcium and aluminum (SFCA and SFCA-I) iron ore sinter bonding phases during heating in synthetic mixtures was investigated using in situ x-ray diffraction. The novelty of this study is in the intricate detail in which the formation mechanisms of the SFCA-I and SFCA phases are characterized, and the observation of the effects of MgO addition on intermediate phases. For example, the significant mechanistic effect of increasing MgO content is the lack of additional SFCA formed after SFCA-I decomposition, with additional magnesioferrite spinel being formed instead. In MgO-free mixtures, the decomposition of SFCA-I typically results in a significant increase in SFCA concentration. Through the results of phase equilibria experiments, this study also provides evidence that the SFCA-I structure accommodates more Mg2+ than the SFCA structure, which is consistent with evidence that the SFCA-I structure contains a higher amount of Fe2+ than SFCA.

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Acknowledgements

This research was undertaken on the powder diffraction beamline (10BM1) at the Australian Synchrotron (part of ANSTO), Victoria, Australia, under beamtime award AS132/PD/6321. Dr Bree Morgan (formerly CSIRO Mineral Resources and now at the University of Sydney) is thanked for assistance with data collection.

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Authors and Affiliations

  1. CSIRO Mineral Resources, Private Bag 10, Clayton South, VIC, 3169, Australia

    Nathan A. S. Webster, Mark I. Pownceby & Rachel Pattel

  2. CSIRO Mineral Resources, PO Box 883, Kenmore, QLD, 4069, Australia

    James R. Manuel

  3. Australian Synchrotron, ANSTO, 800 Blackburn Rd, Clayton, VIC, 3168, Australia

    Justin A. Kimpton

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  1. Nathan A. S. Webster
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  2. Mark I. Pownceby
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Correspondence to Nathan A. S. Webster.

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Webster, N.A.S., Pownceby, M.I., Manuel, J.R. et al. Fundamentals of Silico-Ferrite of Calcium and Aluminum (SFCA) and SFCA-I Iron Ore Sinter Bonding Phase Formation: Effects of MgO on Phase Formation During Heating. JOM 73, 299–305 (2021). https://doi.org/10.1007/s11837-020-04430-y

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  • DOI: https://doi.org/10.1007/s11837-020-04430-y

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