基于图像处理的矿石颗粒三维微观孔隙结构演化  

3D micropore structure evolution of ore particles based on image processing

作　　者：杨保华[1,2] 吴爱祥[2,3] 缪秀秀[2,3] 

机构地区：[1]湖南涉外经济学院信号与信息处理研究所,长沙410205 [2]北京科技大学土木与环境工程学院,北京100083 [3]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《工程科学学报》2016年第3期328-334,共7页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51304076);长江学者和创新团队发展计划资助项目(IRT0950);湖南省自然科学基金资助项目(14JJ4064)

摘　　要：采用高精度显微CT技术及三维图像分析方法研究氧化铜矿石颗粒在酸浸前后内部微观孔隙结构特征及其演变,考察孔隙率、孔隙尺寸分布、孔隙连通度、孔隙分维等参数的变化规律.结果表明：酸浸后矿石颗粒的孔隙率明显增加,孔隙尺寸分布范围更广,出现一定比例的大孔隙,平均孔隙直径增加2~3倍;孔隙连通度在酸浸前基本为零,酸浸后明显增加,并在各方向上呈现空间变异性;孔隙分维数在浸出结束后也有所增大,且在一定范围内与孔隙率及平均孔隙直径呈指数增长关系.借助三维图像分析可实现矿石浸出过程中内部微观孔隙结构的定量描述,从而揭示矿石颗粒孔隙结构的演化规律.The micropore structure and evolution of copper oxide ore particles before and after acid leaching were investigated by high resolution X-ray micro-computed tomography（ micro-CT） and three-dimensional（ 3D） image analysis. The pore structure parameters,such as porosity,pore size distribution,pore connectivity and fractal dimension were statistically calculated. The results indicate that after acid leaching,the porosity increases obviously and the pore size distributes more widely. Some large pores appear and the mean pore diameter increases by 2 to 3 times. There is little pore connectivity before acid leaching,while the pore connectivity increases significantly after acid leaching,being inhomogeneous in three different directions. The fractal dimension of pores also increases after acid leaching,and the porosity and the mean pore diameter grows exponentially with the fractal dimension. 3-D image analysis is a powerful technique to quantitatively characterize the micro-scale pore structure of ore particles during acid leaching,so it facilitates to disclosure the evolution laws of pore structure.

关 键 词：铜矿处理 颗粒 浸出 孔隙结构 CT技术 图像处理 

分 类 号：TF803.21[冶金工程—有色金属冶金]