Isothermal Oxidation Kinetics of Artificial Magnetite Pellets
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2018年第6期
论文作者：张汉泉 FU Jintao 潘建 张峰 GUO Zhengqi
文章页码：1516 - 1523
摘 要：In order to establish the kinetics of oxidation of artificial magnetite pellets, we comprehensively studied kinetics of the oxidation of artificial magnetite pellets from low temperature to high temperature using chemical analysis. The results show that when the oxidation temperature is below 1 073 K（800 ℃）, the reaction is controlled by the step of internal diffusion, and the model function is 23 G（a） =1-3（1-x） 2/3+2（1-x）（α, reaction degree）. When the temperature is above 1 073 K（800 ℃）, the reaction mechanism was chemical reaction, and the model function is 13 G（a） =1-（1-x）1/3. The apparent activation energy for the oxidation of artificial magnetite pellets was also determined, which was 8.90 kJ/mol for the low temperature and 67.79 kJ/mol for the high temperature. Based on the derived kinetic equation for the oxidation of artificial magnetite pellets, the calculated value is consistent with the experimental data. Compared with that of nature magnetite pellets, the apparent activation energy is decreased obviously, which indicates that the artificial magnetite pellets are oxidized more easily than nature magnetite pellets.
张汉泉1，FU Jintao2，潘建3，张峰3，GUO Zhengqi3
1. School of Xingfa Mining Engineering, Wuhan Institute of Technology2. Western Mining Company3. School of Minerals Processing and Bioengineering, Central South University
摘 要：In order to establish the kinetics of oxidation of artificial magnetite pellets, we comprehensively studied kinetics of the oxidation of artificial magnetite pellets from low temperature to high temperature using chemical analysis. The results show that when the oxidation temperature is below 1 073 K（800 ℃）, the reaction is controlled by the step of internal diffusion, and the model function is 23 G（a） =1-3（1-x） 2/3+2（1-x）（α, reaction degree）. When the temperature is above 1 073 K（800 ℃）, the reaction mechanism was chemical reaction, and the model function is 13 G（a） =1-（1-x）1/3. The apparent activation energy for the oxidation of artificial magnetite pellets was also determined, which was 8.90 kJ/mol for the low temperature and 67.79 kJ/mol for the high temperature. Based on the derived kinetic equation for the oxidation of artificial magnetite pellets, the calculated value is consistent with the experimental data. Compared with that of nature magnetite pellets, the apparent activation energy is decreased obviously, which indicates that the artificial magnetite pellets are oxidized more easily than nature magnetite pellets.
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