中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 25 No. 7 July 2015 |
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;
2. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243002, China）
Abstract:The thermal decomposition kinetics of high iron gibbsite ore was investigated under non-isothermal conditions. Popescu method was applied to analyzing the thermal decomposition mechanism. The results show that the most probable thermal decomposition mechanism is the three-dimensional diffusion model of Jander equation, and the mechanism code is D3. The activation energy and pre-exponential factor for thermal decomposition of high iron gibbsite ore calculated by the Popescu method are 75.36 kJ/mol and 1.51×105 s-1, respectively. The correctness of the obtained mechanism function is validated by the activation energy acquired by the iso-conversional method. Popescu method is a rational and reliable method for the analysis of the thermal decomposition mechanism of high iron gibbsite ore.
Key words: high iron gibbsite ore; thermal decomposition kinetics; activation energy; pre-exponential factor; Popescu method
