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

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，Mn₂O₃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; Fe₂O₃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Mn₂O₃和Fe₂O₃还原反应更容易进行，且锰氧化物由Mn₂O₃直接还原为MnO,不需要先还原为Mn₃O₄中间产物。

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

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 Mn₂O₃ is controlled by chemical reaction, with apparent activation energy of 42.64 kJ/mol. However, the magnetization process of Fe₂O₃ is controlled by internal diffusion, with apparent activation energy of 21.30 kJ/mol. Compared to coal-based roasting process, Mn₂O₃ and Fe₂O₃ are easier to be reduced during the process of gas-based reduction roasting, and the manganese oxides can be directly reduced from Mn₂O₃ to MnO without the step of being reduced to intermediate product Mn₃O₄.