Non-Isothermal Kinetics of Reduction Reaction of Oxidized Pellet Under Microwave Irradiation

Autor: Kai Wu, Hu Peng, Bing Hu, Zhu-cheng Huang, Tao Jiang
Rok vydání: 2012
Předmět:
Zdroj: Journal of Iron and Steel Research International. 19:1-4
ISSN: 2210-3988
1006-706X
Popis: The microwave heating characteristics of the mixture with oxidized pellet and coal was studied, and the non-isothermal reduction dynamics is discussed. The results show that, the slow-heating stage of the temperature rising process can be segmented into two heating temperature curves approximately that have good linear relation- ship. They can be seen as temperature programming. In the first stage, between 827 and 1073 K, the reaction mechanism obeys diffusion controlled model. In the second stage, between 1 093 and 1 323 K, the reaction mecha- nism also obeys diffusion controlled model. The apparent activation energies are found to be 75.13 kJ/mol for the first stage and 53.17 kJ/mol for the second stage. That is lower than the apparent activation energy under conven- tional heating. The microstructure of the reduced pellets shows that microwave can improve the kinetics of the reduc- tion. Microwave has anxo-action to the reaction obviously.
Databáze: OpenAIRE
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