The Penetration Processes of Red Mud Filtrate in a Porous Medium by Seepage
The Penetration Processes of Red Mud Filtrate in a Porous Medium by Seepage
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DOI：
10.1007/s11242-017-0829-9
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发表时间：
2017-02
影响因子：
2.7
通讯作者：
B. Bai;Jiaqing Wang;Zhenqian Zhai;Tao Xu
中科院分区：
文献类型：
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作者：
B. Bai;Jiaqing Wang;Zhenqian Zhai;Tao Xu
本研究研究了流速、赤泥颗粒浓度和离子浓度对细颗粒赤泥滤液在多孔介质中渗流渗透过程的影响。结果表明，高碱度赤泥颗粒的穿透曲线（BTCs）峰值浓度远高于低碱度赤泥颗粒的峰值浓度，说明离子的存在增强了赤泥颗粒之间以及赤泥颗粒与基体之间的排斥作用，促进了赤泥颗粒的运移。由于赤泥颗粒与多孔介电基体之间的吸附力比硅粉更大，因此赤泥颗粒更容易吸附到多孔介质表面或嵌入基体中。由于应变捕获效应和迂回路径效应，这些赤泥颗粒的渗透速度往往比水的速度慢，特别是在高注入浓度和低碱度的情况下。回收颗粒的回收率和众数尺寸均随流速的增加而增大，且高碱度颗粒的回收率高于低碱度颗粒的回收率，这可能是由于颗粒之间以及颗粒与基体之间的排斥作用更强。从基本解的基础上，提出了污染物强度随时间变化的多孔介质中颗粒迁移的解析解，并且重复三脉冲喷射的预测 BTC 与实验结果吻合良好。
This study investigated the effect of flow velocity, the concentration of red mud particles, and the concentration ofions on the penetration processes of red mud filtrate with fine particles in a porous medium by seepage. The results show that the peak concentrations of the breakthrough curves (BTCs) of red mud particles with high alkalinity are much higher than that with low alkalinity, indicating that the existence ofions enhances the repulsive interaction between red mud particles and between red mud particles and the matrix and promotes the migration of red mud particles. The red mud particles are more easily absorb onto the surface of porous medium or embedded in the matrix due to the greater adsorption between red mud particles and porous dielectric matrix than silicon powders. The penetration velocity of these red mud particles is often slower than water velocity due to the capture effect by straining and the detours path effect, especially in the case of high injection concentration and low alkalinity. Both the recovery rate and modal size of recovered particles increase with the increase in flow velocity, and the recovery rate of particles with high alkalinity is higher than that of particles with low alkalinity, which can be attributed to the stronger repulsive interaction between particles and between particles and the matrix. An analytical solution for the migration of particles in a porous medium in which the contaminant intensity varies with time has been developed from the elementary solution, and the predicted BTCs for a repeated three-pulse injection are in good accordance with the experimental results.