Solid-phase Decarburization Kinetics of High-carbon Ferromanganese Powders by Microwave Heating

• Published in: Journal of iron and steel research, international Vol. 22; no. 4; pp. 311 - 316
• Main Authors: GUO, Li-na, CHEN, Jin, ZHAO, Jing, LIN, Wan-ming, SHI, Wen-li, LIANG, Min
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.04.2015; Springer Singapore
• Subjects: Applied and Technical Physics; calcium carbonate powder; Engineering; high-carbon ferromanganese powder; kinetics; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Metallurgy and Metal Working; microwave heating; Physical Chemistry; Processes; solid-phase decarburization; 关键控制点; 动力学; 固相; 微波加热; 微波吸收性能; 脱碳; 铁粉; 高碳; microwave heating; high-carbon ferromanganese powder; calcium carbonate powder; solid-phase decarburization; kinetics
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(15)30005-4

Solid-phase decarburization of high-carbon ferromanganese powders （HCFPs） was conducted using calcium carbonate powders （CCPs） as a decarburizer by microwave heating. Solid-phase decarburization kinelSics was investi- gated by isothermal method. The results show that the HCFPs show excellent microwave absorption at a higher av- erage heating rate of 80 ℃/min, while CCPs exhibit poor microwave absorption at a lower heating rate of 5--20 ℃/min; the heating characteristics are in-between when HCFPs and CCPs are mixed. The average heating rates of the mix- ture are 32.14, 31.25, 31.43, and 30.77 ℃/rain when the mixture is heated up to 900, 1000, 1100, and 1200 ℃, respectively. The good microwave absorption property of the mixed material lays the foundation for the solid-phase decarburization of HCFPs containing CCPs. Solid-phase decarburization of HCFPs containing CCPs is a first-order reaction by microwave heating. Apparent activation energy of solid-phase decarburization is 55.07 kJ/mol, which is far less than that of ordinary carbon gasification reaction and that of solid-phase decarburization under the same de- carburization condition by conventional heating. It indicates that microwave heating not only produces thermal effect, but also has non-thermal effect.