复合粘结剂球团和氧化球团直接还原对比研究  

Comparison Study on Direct Reduction of Composite Binder Pellets and Oxidized Pellets

作　　者：李建[1] 朱德庆[2] 邱冠周[2] 李肇毅[1] 

机构地区：[1]宝钢研究院炼铁新技术研究所,上海210092 [2]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《矿冶工程》2010年第3期82-85,共4页Mining and Metallurgical Engineering

摘　　要：对复合粘结剂球团和氧化球团微观结构、还原动力学参数、还原后强度进行了试验研究。研究结果表明：复合粘结剂球团中矿物颗粒细小,平均尺寸为59-104μm2,孔隙率高,达到54%-56%,而氧化球团中矿物颗粒粗大,平均尺寸为1 047μm2,孔隙率低,为30%;当还原温度大于900℃时,复合粘结剂球团可快速还原,而氧化球团需要大于1 000℃;800-1 000℃还原过程中,复合粘结球团化学反应速率常数k和扩散系数De明显大于氧化球团;还原后,复合粘结剂球团结构完整,强度远大于氧化球团。研究结果表明,在直接还原工艺中,复合粘结剂球团具有孔隙率高、还原速度快、强度高的优点。Experimental studies on microstructure,reduction Kinetics parameters and strength after reduction of composite binder pellets and oxidized pellets were carried out.The results showed that the mineral particles in composite binder pellets were fine,the average size was 59～104 μm2,the porosity was high and reached 54%～57%,while the mineral particles in oxidized pellets were coarse,the average size was 1 047μm2,the porosity was low and was 30%.When the reduction temperature was above 900 ℃,the composite binder pellets can be reduced rapidly,while the temperature needed by oxidized pellets was more than 1 000 ℃.During reduction process at 800～1 000 ℃,the chemical reduction rate constant K and diffusion coefficient De of composite binder pellets were significantly larger than that of oxidized pellets.After reduction,the structure of composite binder pellets was complete and the strength was much larger than that of oxidized ones.The results indicated that composite binder pellets have advantages of high porosity,rapid reduction rate and high strength during direct reduction process.

关 键 词：烧结球团 直接还原铁 复合粘结剂球团 氧化球团 微观结构 还原动力学 

分 类 号：TF111[冶金工程—冶金物理化学]