|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||8th International Symposium on High Temperature Metallurgical Processing
||E-36: Assessment of Crystallization Kinetic Study of Phosphate–enriched Phase in CaO–SiO2–FeO–P2O5–Fe2O3 Steelmaking Slags
||Jin-yan Li, Zhang Mei, Guo Min
|On-Site Speaker (Planned)
The iso-thermal crystallization kinetic of phosphate–enriched phase has been investigated through JMAK equation in the rapidly quenched CaO–SiO2–FeO–Fe2O3–P2O5 steelmaking slags with different cooling process. From the statistically analyzed by image manipulation software Image-pro-plus and the scanning electron microscope (SEM) images, the crystallized fraction of phosphate–enriched phase was calculated to determine the values of Avrami exponent n and the temperature-dependent constant k(T) in the slags. Thus, the apparent activation energy E was obtained. The results show that the average of Avrami exponent n is about 0.472 during the crystallization of phosphate–enriched phase and the apparent activation energy E for crystallization in this study is about –278.44 KJ/mol. The apparent activation energy E for crystallization was obtained by using seven different constant k(T), where the error of Van’t Hoff’s No. 2 model (M7) is minimum and its error of the apparent activation energy E calculated with Arrhennius equation is maximum. The determined rate constant equations k(T) of M7 can be described as lnk=53.80+11163.69/T-7.49lnT-0.005T.
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