材料期刊网

为了研究某高铝型褐铁矿直接还原过程中的物相变化规律,采用偏光显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)和矿物自动解理系统(MLA)对某高铝型褐铁矿进行矿物组分分析,然后对其矿物水分进行定性测定.结果表明,该高铝型褐铁矿主要由针铁矿、赤铁矿、铬铁矿、石英和绿泥石等矿物组成,原矿微观形貌是以疏松状针铁矿为主,其内部嵌布有粒径不同的铬铁矿、赤铁矿和硅酸盐等矿物,导致其部分客晶矿物难以通过物理分选去除,Cr、Ni和Co等有益元素主要是以针铁矿、铬铁矿等为赋存载体;结晶水的研究结果表明,在升温过程中针铁矿和绿泥石分别在290 ℃和830 ℃先后失去结晶水或者羟基,导致物相转变为赤铁矿和橄榄石相.

In order to study the phase change law of one high aluminum limonite in direct reduction process, the mineral constituent was analyzed by polarized light microscopy, scanning electron microscope (SEM), X-ray diffractometer (XRD) and Mineral Liberation Analyzer (MLA).Then, the content of water was qualitatively determined.The results indicated that this high aluminum limonite was mainly composed of goethite, hematite, chromite, quartz and chlorite.The microscopic morphology of ore was dominated in loose goethite, and its internal structure contained chromite, hematite and silicate minerals with differentgrain sizes.As a consequence, some chadacryst minerals were hardly removed by physical separation.The beneficial elements such as Cr, Ni and Co mainly existed in carriers including goethite and chorite.The testing results of crystal water indicated that the crystal water or hydroxyl was lost in temperature rise process at 290 ℃ and 830 ℃ for goethite and chlorite, respectively.As a result, the phases changed to hematite and olivine.