基于工业CT微观孔隙结构表征球团矿抗压强度

Characterizing compressive strength of pellet ore based on micro-pore structure captured through industrial CT

球团矿内部的微观孔隙分布及孔隙率对球团的各项性能有着显著影响。基于X射线计算机断层扫描(CT)方法获得球团矿微观孔隙结构,根据孔径D的大小将其划分为微孔(D<20μm)、中孔(20μm≤D≤60μm)和大孔(D>60μm),分析不同孔径微孔与抗压强度的关系,并以此为基础提出球团矿孔隙指数I_(p),由其表征球团矿的抗压强度。研究结果表明,在原料条件相对稳定的情况下,I_(p)越大球团矿内小于20μm的微孔比例越大,球团矿的抗压强度越大。该方法不仅可以精准获得球团矿的基础特性,而且能准确直观地表征统一尺度后球团矿的孔隙率及抗压强度,这为科研、生产人员提供了一种新的分析方法,也为评估球团矿质量提供了一种新的指标。

The micro-pore distribution and porosity of pellet ore significantly affect its properties.The micro-pore structure of pellet ore was characterized by X-ray computed tomography(CT)and the pores were classified into mi-cro-pores(D<20μm),meso-pores(20μm≤D≤60μm),and macro-pores(D>60μm)based on their size(D).The relationship between pore size and compressive strength was analyzed and a porosity index(I,)was proposed to characterize the compressive strength of pellet ore.The results show that under relatively stable raw material condi-tions,the higher the I_(p),the greater the proportion of micro-pore less than 2oμm in the pellet ore,and the greater the compressive strength of pellet ore.This method can accurately obtain the basic characteristics of pellet ore and express its porosity and compressive strength after scaling.It provides a new analysis method for researchers and practitioners and a new indicator for evaluating pellet ore quality.