摘要
应用自制的多功能实验装置同时进行了矿岩散体介质的柱浸实验和渗流实验,并采用X光CT技术采集了矿岩散体介质在浸出前后的孔隙图像.基于图像处理技术探明了其浸出前后孔隙率和孔隙连通性的演化规律,并分析了浸出过程中孔隙演化的主要原因.结果表明,堆浸系统中矿岩散体介质的孔隙率存在空间和时间变异性,随着高度的降低而逐渐减小,浸出后减小趋势更为明显,其平均孔隙率比浸出前减小了1.71%;孔隙连通性也存在空间和时间变异性,浸出后上部区域连通性得到改善,但下部区域的连通性明显劣化;浸出过程中矿岩散体介质的孔隙演化使渗流性能逐渐下降,下降幅度为31.37%,主要原因是其在多因素作用下的整体沉降和细颗粒的运移及堆积.
The experiments of the column leaching and percolation of ore granular media were conducted by using the home-made multifunctional equipment simultaneously and the pore structure images of the ore granular media were obtained by X-ray computed tomography before and after leaching. Based on the image processing operations, the spatial distribution of the porosity and the change rule of the pore connectivity before and after leaching were investigated, and the reasons of pore structure evolution during leaching were analyzed. The results indicate that the porosity of ore granular media during leaching has spatial and temporal variability, which decreases as height decreasing. The trend is more obvious after leaching and the average porosity lowers by 1.71% than that before leaching. The connectivity of the pores also has spatial and temporal variability. After leaching, the connectivity of upper zone has been improved. However, the lower zone has been weakened seriously. The evolution of the pore structure makes the percolation coefficient decrease gradually by 31.37%. The main reasons for the evolution are the subsidence of the whole ore granular body and the transportation and accumulation of the smaller ore particles from top to bottom under the influences of multi-factors.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2007年第5期960-966,共7页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:50574099)
国家重点基础研究发展规划(973)基金资助项目(编号:2004CB619205)
国家杰出青年基金资助项目(编号:50325415)
湖南省自然科学基金资助项目(编号:06JJ30024)
关键词
矿岩散体介质
柱浸
X光CT技术
孔隙演化
渗流性能
ore granular media
column leaching
X-ray CT
pore structure evolution
percolation coefficient
