Kinetics of Oxidation Reaction for Magnetite Pellets

作     者：LIANG Ru-quan YANG Shuo YAN Fu-sheng HE Ji-cheng 

作者机构：Key Laboratory of National Education Ministry for Electromagnetic Process of MaterialsNortheastern University Research InstituteNortheastern University 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2013年第20卷第9期

页      面：16-20页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 080601[工学-冶金物理化学] 

基　　金：Sponsored by National Natural Science Foundation of China(59374166 11072057) 

主　　题：magnetite pellet shaft furnace kinetics oxidation reaction controlling step 

摘      要：An experiment for the oxidation process of single magnetite pellet and theoretical analysis based on modi lied unreacted core shrinking （MUCS） model were carried out, and the controlling mechanisms of the initial and de veloping reactions were examined, respectively. From the study of the initial reaction, it was found that the chemical reaction of surface is the controlling step of the overall reaction when the temperature is up to about 750 K, while the mass transfer through the gaseous boundary layer dominates the reaction rate when the temperature is above 750 K. As the reaction developing within the pellet, the mass transfer through the produced layer becomes the controlling step. In addition, the effects of reaction conditions （such as oxygen concentration, temperature） on the fractional oxidation of magnetite pellet were determined.