高铁氧化锰矿还原过程中铁锰氧化物同步还原动力学研究  

Kinetics of Simultaneous Reduction of Iron and Manganese Oxides During Reduction of High-Iron Manganese Oxide Ore

作　　者：张汉泉[1] 杨帆[1] 许鑫 路漫漫[1] ZHANG Hanquan;YANG Fan;XU Xin;LU Manman(School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan 430205,Hubei,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430205

出　　处：《矿冶工程》2023年第1期84-88,94,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51974204,52204276);广西建筑新能源与节能重点实验室开放基金(22-J-22-2)。

摘　　要：分别采用气基(CO)和煤粉为还原剂,在管炉中进行了高铁氧化锰矿还原焙烧试验,探究了焙烧温度和焙烧时间对高铁氧化锰矿中锰和铁氧化物同步还原的影响。结果表明,气基还原焙烧条件下,Mn_(2)O_(3)还原过程受化学反应控制,还原反应表观活化能为42.64 kJ/mol;Fe_(2)O_(3)还原过程受内扩散控制,还原反应表观活化能为21.30 kJ/mol。与煤基焙烧相比,气基还原焙烧过程中Mn_(2)O_(3)和Fe_(2)O_(3)还原反应更容易进行,且锰氧化物由Mn_(2)O_(3)直接还原为MnO,不需要先还原为Mn_(3)O_(4)中间产物。Experiments were performed in a tube furnace for reduction roasting of high-iron manganese oxide ore, respectively with gas-based(CO) and pulverized coal as reducing agents. The effects of roasting temperature and roasting time on the simultaneous reduction of manganese and iron oxides therein were investigated. The results show that during the gas-based reduction roasting, the reduction process of Mn_(2)O_(3)is controlled by chemical reaction, with apparent activation energy of 42.64 kJ/mol. However, the magnetization process of Fe_(2)O_(3)is controlled by internal diffusion, with apparent activation energy of 21.30 kJ/mol. Compared to coal-based roasting process, Mn_(2)O_(3)and Fe_(2)O_(3)are easier to be reduced during the process of gas-based reduction roasting, and the manganese oxides can be directly reduced from Mn_(2)O_(3)to MnO without the step of being reduced to intermediate product Mn_(3)O_(4).

关 键 词：氧化锰矿 动力学 限制环节 还原焙烧 活化能 气基还原 煤基还原 

分 类 号：TF111[冶金工程—冶金物理化学]