摘要
为对全尾矿浓密压密区的细观结构进行三维表征和定量化研究,使用显微CT对压密区进行了扫描,基于体绘制方法进行了絮团和孔隙结构的三维重构,并对絮团分形维数、絮团面积率、孔隙分支数量、孔隙尺寸、孔隙连通密度等参数的变化规律进行研究。结果表明:①压密区絮团体积所占比重较大,并且絮团连通性较好,絮团面积率与絮团分形维数的变化趋势相反;②绝大部分孔隙的分支数目不超过2个,分支长度大多较短小;③压密区孔隙结构数量众多,但孔隙基本较小,体积小于500μm3的孔隙占98.6%,表面积小于500μm2的孔隙占97.6%,孔隙结构的连通性不佳,连通密度最高为0.000 218。通过压密区絮团结构和孔隙结构的三维重构,以及对孔隙与絮团各项结构参数的分析,有利于进一步揭示全尾矿浓密压密区细观结构规律。
In order to carry out three-dimensional characterization and quantification of the meso-structure of compacted area in total tailings thickening,micro-CT is used to scan the compacted area.Based on volume rendering method,the three-dimensional reconstruction of flocs and pores structure is carried out,and the variation law of parameters such as fractal dimension of flocs,floc area ratio,pore branching distribution,pore size and pore connectivity density are studied.The results indicated that:①volume of the flocs in the compacted area accounts for a large proportion,and the floc connectivity is very good,the floc area ratio is contrary to the change trend of fractal dimension of flocs;②the majority of the pores have no more than two branches,and length of the branches is mostly short;③there are many pore structures in the compacted area,but the pore size is relatively small,the volume of pores less than 500 μm3 accounts for 98.6%,and the surface area of pores less than 500μm2 accounts for 97.6%,the connectivity of pore structure is not good,and the highest connectivity density is 0.000 218.Through three-dimensional reconstruction of the floc and pore structure in the compacted area,as well as the analysis of the structural parameters of the pores and flocs,it is helpful to reveal the law of the mesostructure of compacted area in total tailings thickening.
作者
侯贺子
李翠平
王少勇
颜丙恒
Hou Hezi;Li Cuiping;Wang Shaoyong;Yan Bingheng(School of Civil and Resource Engineering ,University of Science and Technology Beijing,Beijing 100083,China;State Key hiboratory of High-efficient Mining and Safety of Metal Mines .Ministry of Education,Beijing 100083,China)
出处
《金属矿山》
CAS
北大核心
2019年第3期73-78,共6页
Metal Mine
基金
"十三五"国家重大研发计划项目(编号:2016YFC0600709)
国家自然科学基金项目(编号:51774039)
中央高校基本科研业务费专项(编号:FRF-BD-18-006A)
关键词
尾矿浓密
CT扫描
三维重构
孔隙
絮团
Thickening of tailings
CT scan
3D reconstruction
Pore
Floc
