复杂铁矿物闪速磁化焙烧前后的物化特征

Physical and chemistry characteristics on flash magnetic roasting of complicated iron minerals

利用穆斯堡尔谱（CEMS）方法，结合X射线衍射（RXD）和磁性能测试等手段，研究粒度-0．30mm的酒钢富含镜铁矿、褐铁矿和镁（锰）菱铁矿难选铁粉料闪速磁化焙烧前、后的物理和化学特征，探讨闪速磁化焙烧过程中弱磁性铁矿物的固态相变及磁性变化规律。研究表明：弱磁性细粒铁矿物的相变均转变为龟裂较为发育的人造磁铁矿，其比饱和磁矩的增加值较焙烧前增加33～42倍不等，综合效果与磁选管分选的铁回收率相吻合；在此磁化焙烧过程中，菱铁矿的磁化转变过程主要由化学反应速度控制，而镜铁矿的磁化转变过程受扩散控制影响，部分未转化完全。

Iron minerals＇ phase transformation and magnetic properties＇ variation were investigated with magnetic detection, X--ray diffraction and Mossbauer spectra on JISC＇s refractory powder ferrous material （--0.30 mm） which was rich in specularite, limonite and Mg--Mn siderite. The results of XRD analysis and Mossbauer spectra records of the iron material before and after FMR indicate that weakly magnetic iron minerals is mainly converted into strongly magnetic material Fe304 with many cracks in iron material after FMR. The efficiency of FMR are consistent with TFe recovery of magnetic separation, meantime, the specific saturation magnetic moment increase from 33 to 42 times after FMR. In the process of FMR, magnetization transformation of Mg-Mn siderite is mainly controlled by chemical reaction, but that of specularite by diffusion and part of it not magnetized.