Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第7期    总第256期    2020年7月

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文章编号:1004-0609(2020)-07-1730-08
界面微渗透作用下浸堆内部渗流场无损探测
薛振林1,甘德清1,张友志1,刘志义1,黄明清2

(1. 华北理工大学 矿业工程学院,唐山 063210;
2. 福州大学 紫金矿业学院,福州 350116
)

摘 要: 为了揭示矿石与溶液界面微渗透作用对矿石间细观流场分布影响,基于堆内实测结构构建了浸矿结构物理模型,利用粒子图像测速技术(PIV)对结构内溶液渗流场进行无损探测。结果表明:在矿-液界面持续的微渗透作用下,速度场的均衡性显著提高,优势流的发生得到抑制,浸出盲区大幅降低,最大流速下降50%;界面的微流动使得流场中有漩流动区域大幅提高,涡量值分布呈现贴壁性,涡量同向聚集且边缘方向突变时形成漩涡;在实验的喷淋强度范围内,结构内流速分布均匀性和最大流速值会随着喷淋强度的增加而提高。

 

关键字: 堆浸;微渗透;渗流;优先流;无损探测

Non-destructive detection of solution flow behavior during heap leaching considering interface micro-infiltration
XUE Zhen-lin1, GAN De-qing1, ZHANG You-zhi1, LIU Zhi-yi1, HUANG Ming-qing2

1. College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China;
2. College of Zijin Mining, Fuzhou University, Fuzhou 350116, China

Abstract:In order to reveal the effect of micro-infiltration at the interface between ore and solution on the microscopic flow field distribution in the ore particles, the leaching structure model was established based on the measured structure in leaching heap, and the solution flow behavior during heap leaching was detected in a non-destructive detection way by using PIV technique. The results show that, under the continuous micro-infiltration at the mineral-liquid interface, the equilibrium of the velocity field is significantly improved, the occurrence of the preferential flow is suppressed, the leaching blind zone is greatly reduced, and the maximum flow velocity is reduced by 50%. The swirling flow area is greatly improved under the effect of micro-infiltration, and the vorticity distribution presents adherent. A vortex is formed when the vortices gather in the same direction and the edge direction changes. Within the spray intensity range of the experiment, the uniformity of flow velocity distribution and the maximum flow velocity value will increase with the increase of spray intensity.

 

Key words: heap leaching; micro-infiltration; seepage; preferential flow; non-destructive detection

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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