唐惠阳. 堆浸体系内微细颗粒在孔隙内迁移和附着规律研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.09.23.002
引用本文: 唐惠阳. 堆浸体系内微细颗粒在孔隙内迁移和附着规律研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.09.23.002
Study on migration and adhesion of fine particles in pores in heap leaching system[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.09.23.002
Citation: Study on migration and adhesion of fine particles in pores in heap leaching system[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.09.23.002

堆浸体系内微细颗粒在孔隙内迁移和附着规律研究

Study on migration and adhesion of fine particles in pores in heap leaching system

  • 摘要: 在堆浸过程中,堆浸体系内游离的颗粒会随着溶液的流动而移动,从而对浸出的速度和效率产生影响。对于粒径较小的微细颗粒,虽然难以对颗粒间孔隙产生堵塞,但其在孔隙壁表面的大量附着也会影响溶液向颗粒内孔隙的渗入从而影响浸出效率。本文基于真实的孔隙结构使用Fluent软件开展仿真模拟实验,从粒径、颗粒密度和流体流速三个方面探究它们对微细颗粒在孔隙内迁移和附着行为的影响。模拟结果表明,当颗粒粒径为1×10-6 m时几乎没有颗粒会沉积附着在孔隙内。而随着粒径的增大,附着在孔隙壁表面的颗粒数量会呈现先增多后减少的趋势,且不同密度的颗粒附着百分比在峰值处均超过了90%。观察发现颗粒的主要附着部位为弯孔隙的外壁以及流速较小、坡度较缓的小孔隙内。分析认为粒径和密度越大的颗粒,其重力和惯性对其运动轨迹的影响越大,而流体对其轨迹运动的影响越小,在迁移过程中更容易靠近孔隙壁从而导致颗粒附着。且大粒径、大密度的颗粒主要在大孔隙内迁移,轨迹较为集中。而小粒径、低密度的颗粒,在高流速流体内迁移时,其水平运动幅度更大,迁移轨迹分布更加分散,更容易进入小孔隙内迁移。

     

    Abstract: In the process of heap leaching, the free particles in the heap leaching system move with the flow of the solution, which affect the speed and efficiency of the leaching. For small grain size particles, although it is difficult to clog the interparticle pores, its large amount of adhesion on the pore wall surface also affect the infiltration of solution into the pore wall and thus affect the leaching efficiency. In this experiment, the effects of particle size, particle density and fluid velocity on the migration and adhesion behavior of fine particles in pores were investigated by means of simulation. The simulation results show that when the particle size is 1×10-6 m, almost no particles deposite in the pores. With the increase of particle size, the number of particles attached to the surface of the pore wall first increase and then decrease. The particle adhesion percentage of different density is more than 90% at the peak. The main adhesion sites of particles are the outer walls of curved pores and the small pores with low flow velocity and low slope. The analysis shows that the larger the particle size and density, the greater the influence of gravity and inertia on its trajectory, while the smaller the influence of fluid on its trajectory, the easier it is to get close to the pore wall during migration, resulting in particle attachment. In addition, the large particle size and high density particles mainly migrate in the large pores, and the trajectories are relatively concentrated. However, when small particle size and low density particles migrate in high flow velocity fluid, their horizontal motion amplitude is larger, the migration trajectory distribution is more dispersed, and the distribution is also in small pores.

     

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