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Experimental measurements of the permeability characteristics of rare earth ore under the hydro-chemical coupling effect

机译：水-化学耦合作用下稀土矿石渗透特性的实验测量

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Two coupling processes—solution seepage and chemical replacement—occur in the in situ leaching process of ion-absorbed-rare-earth ore. In this study, saturated leaching tests were applied to investigate the permeability characteristics of rare earth ore under the hydro-chemical coupling effect. The pore radius distributions based on two leaching solutions (H _(2) O and (NH _(4) ) _(2) SO _(4) ) were obtained by nuclear magnetic resonance detection technology. The results indicated that 10–25 μm and 4–10 μm pores are dominant in the ore under solution leaching using H _(2) O and (NH _(4) ) _(2) SO _(4) , respectively. A “black belt” in the pores of (NH _(4) ) _(2) SO _(4) leaching was discovered from the reconstruction of the pore structure distribution image. The results also reveal that the hydraulic conductivity will initially increase, then decrease and finally increase during the leaching process. The hydro-chemical coupling effect will lead to variations in the pore structure and permeability of rare earth ore. The pore radius will increase due to solution seepage, whereas it decreases due to the particle recombination induced by chemical replacement. The permeability of rare earth ore is influenced more by chemical replacement than by solution seepage.
机译：离子吸收稀土矿石的原位浸出过程中发生了两个耦合过程，即溶液渗流和化学置换。在这项研究中，采用饱和浸出试验来研究在水化学耦合作用下稀土矿石的渗透性特征。通过核磁共振检测技术获得了基于两种浸出溶液（H _（2）O和（NH _（4）__（2）SO _（4））的孔半径分布。结果表明，使用H _（2）O和（NH _（4）_（2）SO _（4）进行溶液浸提时，矿石中的10-25μm和4-10μm孔隙占主导地位。从孔隙结构分布图的重建中发现了（NH _（4））_（2）SO _（4）淋溶中的“黑带”。结果还表明，在浸出过程中，水力传导率将先增加，然后降低，最后增加。水化学耦合效应将导致稀土矿的孔隙结构和渗透率发生变化。孔半径将由于溶液的渗透而增加，而孔半径将由于化学置换引起的颗粒复合而减小。稀土矿石的渗透性受化学替代的影响大于受溶液渗透的影响。

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