ABSTRACT

The effect of thermal oxidization pretreatment (TOP) on the magnetization roasting and separation of refractory iron ore was investigated. The TOP of raw samples was performed in a muffle furnace at 750°C for 30 min. The magnetization roasting and separation experiments of the raw samples and TOP samples were performed, which revealed that TOP could decrease the optimal CO concentration required during the magnetization roasting process by 10% and increase the iron recovery by about 10%. Analysis results of X-ray diffraction (XRD), scanning electron microscope (SEM) and vibrating sample magnetometer (VSM) showed that there were many pores and cracks in the TOP samples, which were advantageous to the subsequent magnetization roasting, and promoted the sufficient conversion of specularite and siderite to magnetite, increasing the iron recovery significantly.

摘要

研究了热氧化预处理（TOP）对难选铁矿石磁化焙烧分离的影响。原始样品的 TOP 在 750°C 的马弗炉中进行 30 分钟。对原料样品和TOP样品进行了磁化焙烧分离实验，结果表明，TOP可以将磁化焙烧过程所需的最佳CO浓度降低10%，铁回收率提高10%左右。X射线衍射（XRD）、扫描电镜（SEM）和振动样品磁强计（VSM）分析结果表明，TOP样品中存在较多气孔和裂纹，有利于后续磁化焙烧，促进了充分的磁化焙烧。镜面石和菱铁矿转化为磁铁矿，