摘要
粉煤灰通常含有硅、铝、铁、钙及其它元素。为了更好地利用粉煤灰中的铁,利用磁选将粉煤灰中的铁分离出来。利用激光粒度分析仪研究了磁珠的粒度分布。采用带有能谱的扫描电镜观察了磁珠的外表面、断面、内表面及内包裹微珠形貌。利用X-衍射分析仪分析了磁珠的矿物相。研究发现:磁珠的平均粒径比粉煤灰的平均粒径大10μm,磁珠主要分布在粗颗粒中。磁珠表面析晶体形貌呈粒状、针状、块状、片状和鱼鳞状多种。除了少量的实心磁珠外,粉煤灰中大部分的磁珠是空心的,内部包裹有小微珠。不同形貌磁珠和磁珠不同位置处的铁元素分布不同。表面有粒状析晶的磁珠中铁含量最高,针状析晶磁珠次之。
Fly ash usually contains silicon, aluminum, iron, calcium and other elements. On a hunt for better utilization of iron included in fly ash, ferrous micro - bead was separated from fly ash by magnetic separation. The particle size distribution of ferrous micro - bead was analyzed by utilizing laser granulometer, and the microstructure of its outer surface, cross section, inner surface and inside enwrapped micro - sphere was characterized by scanning electron microscopy （SEM） coupled with an energy dispersive spectrometer （EDS）. X- ray diffraction was used to examine the mineral properties of these beads. It was found that the mean grain diameter of ferrous granules was 10 m greater than that of fly ash, and iron lied in coarse fly ash grain. The geometry shape of crystal separated on the outer surface of ferrous beads took on several different types such as grainy, acicular, nubby, sheet and scale. Except a small quantity of solid sphere, most of ferrous heads were hollow and wraped small spheres. The content of iron element differed according to the type of spheres and the position at the sphere. The iron content of grainy crystal was the most, acicular crystal taking second place.
出处
《矿业研究与开发》
CAS
北大核心
2006年第6期65-68,共4页
Mining Research and Development
关键词
粉煤灰
磁珠
微观形貌
电镜
能谱
Fly ash, Ferrous micro - bead, Microstructure,SEM, Energy spectrum
