低渗透性矿堆浸孔隙率改善研究  

Improvement of Porosity of Low-permeability Ore in Heap Leaching

作　　者：吴爱祥[1] 张杰[1] 江怀春[1] 

机构地区：[1]中南大学资源与安全工程学院

出　　处：《矿冶工程》2006年第6期5-8,12,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金项目(50574099);国家"973"重点基础研究发展规划项目(2004CB619206);国家创新群体科学基金资助项目(50321402)

摘　　要：通过孔隙率测定实验和柱浸实验，探讨了孔隙率与矿堆内部各粒级之间的内在联系，分析了浸出过程中孔隙率变化的机理，提出了改善孔隙率的新方法。研究结果表明：在-0．1，0．1—0．2，0．2-0．4，0．4—0．7，0．7-2．0，2．0—4．0，4．0～8．0，8．0-10．0mm 8个粒级中，0～0．1mm粒级物料（俗称含泥量）对孔隙率的影响最为显著；平均粒径与孔隙率存在一定关系；孔隙率变化机理与堆内微小颗粒含量变化十分密切；垫层通透性的提高和应力波的运用有利于孔隙率状况的改善。On the basis of the results of porosity measuring experiment and column leaching experiment, the relation between porosity and size fraction has been studied. After the mechanism of porosity variation was analyzed, new methods for improving the porosity have been brought forward. The findings show that the effect of G1 （0 - 0.1 mm） is the most notable one among the 8 size fractions （ - 0.1,0.1 - 0.2, 0.2 - 0.4, 0.4 - 0.7, 0.7 - 2.0, 2.0 - 4.0, 4.0 - 8.0 mm and 8.0 - 10.0 mm）. There is a certain relation between the porosity and the average grain diameter. The mechanism of porosity variation is much closely related with the change of micro grain content. The improvement of the cushion permeability or the application of the stress wave to the leaching heap is propitious to advance the porosity.

关 键 词：堆浸 孔隙率 粒级 平均粒径 微小颗粒 垫层 应力波 

分 类 号：TD853[矿业工程—金属矿开采]