Abstract
Dicalcium ferrite (2CaO·Fe2O3, C2F) is one of the most significant bonding phase of fluxed sinters. Reduction of C2F was investigated via thermal kinetics analysis. The isothermal reduction behavior of C2F by 30% H2 and 70% N2 at 1123 K (850 °C), 1173 K (900 °C), and 1223 K (950 °C) were discussed by thermogravimetric analysis in this paper. The results revealed that the C2F reduction was typical one-step reaction. The apparent activation energy of the C2F reduction was 27.40 kJ/mol. The rate-determining steps of the C2F reduction were the first inner gas diffusion, then the inner gas diffusion and interface chemical reaction mixed controlling. The ln-ln analysis implied that the C2F reduction was described by the Avrami–Erofeev (A-E) equation, thus appeared as a 2D A-E equation kinetics reaction.
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References
Phillips B, Muan A (2006) Phase equilibria in the system CaO-iron oxide-SiO2, in air. J Am Ceram Soc 42(9):413–423
Ding C, Lv X, Chen Y et al (2015) Non-isothermal crystallization kinetics for CaO–Fe2O3 system. J Therm Anal Calorim 124(1):509–518
Sosman RB, Merwin HE (1916) Preliminary report on the system, lime: ferric oxide. Wash Acad Sci J 6(15):532–537
Ganguly S (1991) A study of gaseous reduction of calcium ferrites. Ph.D. thesis, The University of Queensland
El-Geassy AA (1996) Reduction of CaO and/or MgO-doped Fe2O3 compacts with carbon-monoxide at 1173-1473 K. ISIJ Int 36:1344–1353
Du S, Sichen N, Staffansson LI (1988) Reduction of calcium ferrites by hydrogen in the temperature interval 1191–1426 K. Scand J Metall 17(5):232–238
Mccune RC, Wynblatt P (2010) Calcium segregation to a magnesium oxide (100) surface. J Am Ceram Soc 66(2):111–117
Vyazovkin S, Wight CA (1999) Model-free and model-fitting approaches to kinetic analysis of isothermal and non-isothermal data. Thermochim Acta 340:53–68
Nasr MI, Khedr MH, El-Geassy AA, Omar AA (1995) Effect of nickel oxide doping on the kinetics and mechanism of iron oxide reduction. ISIJ Int 35(9):1043–1049
Avrami M (1939) Kinetics of phase change. I general theory. J Chem Phys 7(12):1103–1112
Avrami M (1940) Kinetics of phase change: II. transformation—time relation for random distribution of nuclei. J Chem Phys 8(2):212–224
Avrami M (1940) Granulation, phase change, and microstructure kinetics of phase change.III. J Chem Phys 9(2):177–184
Tamhankar SS, Doraiswamy LK (1979) Analysis of solid–solid reactions: a review. AIChE J 25(4):561–582
Ginstling AM, Brounshtein BI (1950) On diffusion kinetics in chemical reactions taking place in spherical powder grains. Zhur Priklad, Khim, p 23
Acknowledgements
The authors are grateful for the financial support provided by the Natural Science Foundation of China (51234010 and 51522403).
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Ding, C. et al. (2018). Thermogravimetric Analysis on Reduction Behavior of Powdery Dicalcium Ferrite. In: Li, B., et al. Characterization of Minerals, Metals, and Materials 2018 . TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72484-3_29
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DOI: https://doi.org/10.1007/978-3-319-72484-3_29
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