Abstract
In this work, the interaction of Fe with MgO–14.5 wt% C refractory under the conditions relevant to the novel flash ironmaking technology (FIT), which has been developed at the University of Utah, has been studied. Oxidation of carbon occurred and the formation of magnesiowustite (MgxFe1−xO) solid solution took place as a result of the interaction between Fe and MgO (in the presence of O2). A kinetic model for the growth of magnesiowustite was developed based on the counterdiffusion of Fe2+ and Mg2+ cations, and experiments were conducted with Fe powders and MgO–14.5 wt% C refractory in the temperature range 1200–1400 °C under flash ironmaking atmospheres. Analyses of samples using SEM-EDX and EPMA confirmed the formation of magnesiowustite and using the experimentally determined composition profiles the values of interdiffusion coefficient, averaged over the composition range (\( \bar{D}_{{{\text{Fe}} - {\text{Mg}}}} \)), were calculated. The activation energy for the solid-state diffusion was calculated to be 377 kJ/mol.
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References
Pinegar HK, Moats MS, Sohn HY (2012) Flow sheet development, process simulation and economic feasibility analysis for novel suspension ironmaking technology based on natural gas: part 1—flow sheet and simulation for ironmaking with reformerless natural gas. Ironmak Steelmak 39(6):398–408
Choi ME, Sohn HY (2010) Development of green suspension ironmaking technology based on hydrogen reduction of iron oxide concentrate: rate measurements. Ironmak Steelmak 37(2):81–88
Wang H, Sohn HY (2007) Hydrogen reduction kinetics of magnetite concentrate particles relevant to a novel flash ironmaking process. Metall Mater Trans B 2013 44(1):133–145
Sohn HY (2007) Suspension ironmaking technology with greatly reduced energy requirement and CO2 emissions. Steel Times Int 31(a):68–72
Mohassab-Ahmed MY, Sohn HY (2013) Application of spectroscopic analysis techniques to the determination of slag structures and properties: effect of water vapor on slag chemistry relevant to a novel flash ironmaking technology. JOM 65(11):1559–1565
Hubble DH (1998) Steel plant refractories. In: Fruehan RJ (ed) The making, shaping and treating of steel 1998. The AISI Steel Foundation; AIST, Pittsburgh, pp 159–226
Smets S, Parada S, Weytjens J, Heylen G, Jones PT, Guo M et al (2003) Behaviour of magnesia-carbon refractories in vacuum-oxygen decarburisation ladle linings. Ironmak Steelmak 30(4):293–300
Pickering GD, Batchelor JD (1972) Carbon–MgO reactions in BOF refractories. Bull Am Ceram. Soc. 50:611–614
Sarkar R (2019) Interactions of iron, wustite and slags with selected refractory materials under flash ironmaking conditions. PhD [dissertation]. University of Utah, Salt Lake City, Utah, USA
Sarkar R, Sohn HY (2019) Interaction of iron with alumina refractory under flash ironmaking conditions. Metall Mater Trans B 50(4):2063–2076
Sarkar R, Sohn HY (2019) Interaction of ferrous oxide with alumina refractory under flash ironmaking conditions. Ceram Int 45(12):15417–15428
Rigby EB, Cutler IB (1965) Interdiffusion studies of the system FexO–MgO. J Am Ceram Soc 48(2):95–99
Carter RE (1961) Mechanism of solid-state reaction between magnessium oxide and aluminum oxide and between magnessium oxide and ferric oxide. J Am Ceram Soc 44(3):116–120
Sata N, Goto KS (2006) Oxygen pressure dependence of cation inter diffusivity in magnesiowustite solid solutions. J Am Ceram Soc 65(3):158–162
Bygden J, DebRoy T, Seetharaman S (1994) Dissolution of MgO in stagnant CaO–FeO–SiO2 slags. Ironmak Steelmak 21:318–323
Wu P, Eriksson G, Pelton AD, Blander M (1993) Prediction of the thermodynamic properties and phase diagrams of silicate systems-Evaluation of the FeO–MgO–SiO2 systems. ISIJ Int. 33(1):26–35
Robie RA, Bethke PB (1962) Molar volumes and densities of minerals. Unites States Department of the Interior Geological Survey, pp 4–21
Liermann HP, Ganguly J (2002) Diffusion kinetics of Fe2+ and Mg in aluminous spinel-experimental determination and applications. Geochim Cosmochim Acta 66(16):2903–2913
Barin I (1993) Thermodynamical data of pure substances, vol I. VCH Publishers, New York, NY
Bale CW, Bélisle E, Chartrand P, Decterov SA, Eriksson G, Gheribi AE et al (2016) FactSage thermochemical software and databases 2010–2016. Calphad (Sept) 54: 35–53. www.factsage.com
Outokumpu Research Oy, Pori, Finland, A. Roine, HSC Chemistry, Version 5.2. www.hsc-chemistry.net
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Sarkar, R., Sohn, H.Y. (2020). A Model for the Interaction of Fe with MgO–14.5 wt% C Refractory Under Flash Ironmaking Conditions. In: Lee, J., Wagstaff, S., Lambotte, G., Allanore, A., Tesfaye, F. (eds) Materials Processing Fundamentals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36556-1_9
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