摘要
针对堆浸溶质运移过程的复杂性和多变性,以揭示溶质运移规律为目的,首先通过对其运移机制进行探讨,并基于矿堆理想渗流假设给出溶质运移均匀流模型,同时考虑矿堆内可流动溶液和不可流动溶液区的作用及其相互影响,建立溶质迁移流动-不流动模型。采用标记物穿透曲线法,进行溶质运移室内管柱实验,主要研究矿石粒径和喷淋强度对溶质运移规律的影响。研究结果表明;大粒径矿样的孔隙直径和孔隙率均比较大,可流动溶液在大孔隙的传导作用而快速流出,因此,溶质初期浓度升高相对较快;而小粒径矿石比表面积大,不可流动溶液比率大,溶质须通过分子扩散运移进入不可流动溶液区,因此,其浓度上升速度较缓;矿堆内不流动溶液是影响溶质运移规律的主要因素,因此,可通过控制矿石颗粒级配和喷淋强度以优化溶质运移过程。
The solute transport process and the transport mechanism were studied due to its complexity and variability.The uniform flow model for solute transport was presented based on the assumption of ideal flow in heap.The mobile-immobile model was set up by considering the interaction and influence between mobile solution and immobile solution zones.Column experiment on the solute transportation was conducted by adopting marker breakthrough curve method.The effect of ore diameter and irrigate rate on solute transportation was investigated.The results show that the initial solute concentration of big ore heap with large pore diameter and ratio increase rapidly,because large quantity of solution flows out with the conductive effect of large pore.The immobile solution ratio in the small ore heap is large because of the large surface area.The solute concentration increases slowly due to the slow molecule diffusion transport process.The immobile solution within the heap is the key factor influencing the solute transportation.The solute transport process could be optimized by controlling the ore size distribution and irrigation rate.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第4期1092-1098,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(50934002
51074013)
长江学者和创新团队发展计划项目(IRT0950)
中国博士后科学基金资助项目(20100480200)
关键词
堆浸
溶质运移
均匀流模型
流动-不流动模型
管柱实验
heap leaching
solute transport
uniform flow model
mobile-immobile model
column experiment
