镜铁矿粉在铁矿烧结混合料中的制粒行为

 对镜铁矿粉在铁矿烧结混合料中的制粒行为进行了研究，结果表明：水分对制粒效果有显著的影响，随着镜铁矿粉配比增加，适宜制粒水分逐渐降低。不同配比镜铁矿粉的制粒动力学研究表明：制粒时间小于3 min时，镜铁矿黏附率快速增长；制粒时间大于3 min时，镜铁矿黏附率趋于稳定。随着镜铁矿粉配比增加，达到黏附平衡所需时间延长。因此，延长制粒时间是改善高配比镜铁矿粉制粒效果的有效措施之一。准颗粒黏附层微观结构研究表明：镜铁矿颗粒呈散点状分布于黏附层中，微细粒级褐铁矿粉颗粒作为黏结剂使黏附层具有一定的强度，促进镜铁矿粉的黏附。镜铁矿粉与制粒性能优良的褐铁矿粉合理搭配使用，有利于改善制粒效果，提高镜铁矿粉配比。

Investigation of granulation behaviors of specularite fines in ferrous sinter mixture

The granulation behaviors of specularite fines in ferrous sinter mixture were studied. The results showed that the moisture had a great effect on granulation， and the optimal moisture content decreased with the increasing specularite fines ratio in the mixture. The dynamic results with different specularite fines ratio showed that the adhering load of specularite fines increases rapidly within 3 min and then levels off. With an increase of specularite fines ratio， the duration needs longer time to reach adhering balance. Therefore it’s an effective way to improve the granulation by extending granulating time at high specularite fines ratio. The microstructures of the layer showed that particles of specularite fines scatter all over the layer without combination which infers that the particles of limonite fines act as a binder between specularite fines and improve the strength of the adhering layer. Granulation and specularite fines ratio could be improved by using specularite fines and limonite fines in the mixture properly.