低硅烧结矿孔隙的表面结构和分形维数计算  

Surface Structure and Fractal Dimension Calculation of Pore in Low Silicon Sinter

作　　者：崔志敏[1] 李远亮[1] 陈颖[1] 张玉柱[2] 

机构地区：[1]河北联合大学分析测试中心,河北唐山063009 [2]河北联合大学冶金与能源学院,河北唐山063009

出　　处：《钢铁》2014年第9期10-14,33,共6页Iron and Steel

基　　金：国家自然科学基金资助项目(50974052)

摘　　要：通过烧结杯试验制备了不同碱度和不同MgO含量2个系列的低硅烧结矿样品。利用XRD(X射线衍射仪)和TEM(透射电子显微镜)分别对样品的结构和表面形貌进行了表征。随碱度和MgO含量提高,CaFe2O4和Fe3O4含量发生了显著变化;孔隙结构由柱状变为溶蚀网状,更加复杂。利用单重分形软件和表面分形模型分别计算了2个系列样品的表面分形维数(Dss和Dsv)。随着碱度和MgO含量提高,表面分形维数增加;利用表面分形模型计算的Dsv和Rsv(线性相关系数)大于单重分形软件计算的Dss和Rss,表面分形模型可以反映更多细节,且相关性更好。因此可以用表面分形模型替代传统的单重分形软件来表征孔隙结构的复杂性,解决了孔隙表面形貌拍摄的困难和选择区域的局限性。Two series of low silica sinter samples with different basicity and MgO content were prepared by sintering pot tests. XRD and TEM were used to characterize the structure and surface morphology of samples： a calcium ferrite and iron oxide content has undergone significant changes with the increasement of alkalinity and MgO content. Structure of pore changes more complex from columnar structure to Mesh erosion structure. Surface fractal dimension of sinter pore were calculated by monofractal software and surface fractal model respectively（ Dss and Dsv ）： Surface fractal dimension increases with the improvement of alkalinity and MgO content, Dsv and Rsv calculated by monofractal software are greater than Dss and Rss calculated by surface fractal model, which indicate that the surface fraetal model can reflect more details, and has better correlationso. So surface fractal model can substitute traditional monofractal software to characterize the fractal structure of sinter pore surface, to solve the difficulties and limitations of the pore surface shooting.

关 键 词：烧结矿 分形 凝固 孔隙率 

分 类 号：TF046.4[冶金工程—冶金物理化学]