摘要
通过对文题的研究，发现反应初期为动力学控制，对［Ｆｅ２＋］为三级反应，频率因子为３．８７×１０１２１ｍｉｎ－１，活化能为１０９．８ｋＪ／ｍｏ１；反应后期为传质控制，对［Ｆｅ２＋］为一级反应，频率因子为５．８７×１０６ｍｉｎ－１，活化能为３５．５ｋＪ／ｍｏｌ。氧分压对宏观反应速率影响不显著，在整个反应过程中反应速率对［Ｏ２］为０．２级反应。还得到了氧化过程的优化串级温度序列。
The influence of oxidation temperature and oxygen concentration on the reaction rate of oxidation of Fe3O4 to γ-Fe2O3 was investigated.It was found that oxidation temperature is of vital importance to both the reaction rate and the magnetism of the products.The reaction in the preliminary period is controlled by kinetic process,the reaction order with respect to [Fe2+]is 3rd,the activation energy is 109.8kJ/mol,and the frequency factor is 3.87×1012min-1.The reaction in the following period is controlled by mass transfer,the reaction order with respect to [Fe2+]is lst,the activation energy is 35.5kJ/mol,and the frequency factor is 5.87×106min-1.The influence of oxygen concentration is relatively minimal,the reaction order with respect to [O2] is 0.2.The optimized temperature sequence was introduced to control the oxidation process and to enhance the magnetism of the products.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
1995年第5期561-566,共6页
Journal of East China University of Science and Technology
关键词
四氧化三铁
氧化
Γ-FE2O3
磁粉
动力学
Magnetite
oxidation
maghemite
magnetic powder
kinetics
temperature sequence
