基于通风强化浸出的矿岩散体孔裂隙双重介质结构演化

发布时间：2018-03-21 21:43

本文选题：非生物堆浸　切入点：通风强化浸出　出处：《工程科学与技术》2017年04期 　论文类型：期刊论文

【摘要】：为解决羊拉铜矿非生物堆浸中因矿堆渗透性差而导致的铜浸出效果不佳的问题,提出通风强化浸出的新设想,以期从改善浸堆体系渗透特性,提高铜浸出效果。首先,针对羊拉铜矿在堆浸过程中发现的问题及现有堆浸多孔介质渗流理论在分析复杂渗流规律中的不足,提出利用堆浸散体孔裂隙双重介质理论研究强制通风对堆浸体系渗透特性的影响机制;然后,对该矿浸堆的矿石粒级分布情况及其类型进行分析与分类;最后,开展不同通风强度下的室内柱浸试验,利用CT扫描技术分析不同试件的孔隙发育情况,并利用电镜扫描(SEM)与分形几何理论对不同通风强度下散体颗粒表面的分形维数、动态裂隙率及动态渗透系数进行研究。结果表明:羊拉铜矿浸堆的矿石颗粒类型为a型,其浸堆松散细颗粒较多因而密实度较高,矿石颗粒粒级分布不合理;从CT扫描结果来看,引入强制通风虽然降低了堆浸体系的孔隙率,但其可以加剧矿石酸浸反应程度,增加浸堆内矿石颗粒数量,从而大大提高堆浸体系的孔隙数量,促进整个体系的孔隙结构发展并对堵塞的渗流通道形成有效冲破,最终提高铜浸出效果;从SEM扫描与分形几何理论分析结果来看,强制通风能够提高矿石颗粒内部对溶浸液的动态渗透系数与颗粒自身的裂隙率,从而强化浸出液中溶质的渗流性能,最终使得铜浸出效果得以提高。
[Abstract]:In order to solve the problem of poor leaching effect of copper in non-biological heap leaching of Yangla Copper Mine, a new idea of enhanced leaching by ventilation is put forward in order to improve the permeation characteristics of heap leaching system and improve the leaching effect of copper. In view of the problems found in the heap leaching process of Yangla Copper Mine and the deficiency of the existing porous media seepage theory in the analysis of complex seepage law, The influence mechanism of forced ventilation on the permeation characteristics of heap leaching system is studied by using the theory of dual medium of pore and fissure in heap leaching. Then, the distribution of ore particle size and its types are analyzed and classified. The indoor column immersion test under different ventilation intensity was carried out, and the pore development of different specimens was analyzed by CT scanning technique. The fractal dimension of particle surface under different ventilation strength was studied by SEM (scanning electron microscope) and fractal geometry theory. The dynamic fracture rate and dynamic permeability coefficient are studied. The results show that the ore particle type of Yangla Copper Mine leaching reactor is a type, its loose fine particles are more and its compactness is higher, the distribution of ore particle size is unreasonable. According to the results of CT scan, although forced ventilation can reduce the porosity of heap leaching system, it can aggravate the degree of acid leaching reaction of ore and increase the number of ore particles in the heap, thus greatly increasing the porosity of heap leaching system. Promote the development of the pore structure of the whole system and break through the blocked seepage channel effectively, and finally improve the leaching effect of copper. From the results of SEM scanning and fractal geometry theory analysis, Forced ventilation can improve the dynamic permeability coefficient of ore particles to the solution and the fracture rate of the particles themselves, thus enhance the seepage performance of solute in leaching solution, and finally improve the leaching effect of copper.
【作者单位】：北京科技大学土木与资源工程学院金属矿山高效开采与安全教育部重点实验室;
【基金】：国家自然科学基金资助项目(51374035;51304011) 新世纪优秀人才支持计划资助项目(NCET-13-0669) 全国优秀博士学位论文作者专项资金资助项目(201351) 中国博士后科学基金资助项目(2017M610773)
【分类号】：TD952

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