溶液窜流对浸堆内细观流场的影响规律

为了探究窜流对矿石浸堆内部细观渗流场分布的影响,基于核磁共振技术获取了堆内细观矿石堆积结构,并通过CFD软件对窜流影响下的渗流场进行数值模拟,分析了窜流影响下喷淋强度和窜流系数对流场分布的影响。结果表明:窜流作用下矿石内部溶液发生缓慢流动,通过溶液在矿-液界面的交换,扩大了渗流场范围,增加了溶液在浸堆内反应的时间,使溶液充分与有用矿物接触,提高了有用物质的浸出率;缓流区和出口边界处流速增加,快速流动区域流速减小,有漩流动增强。在窜流作用下,喷淋强度增加能够促进渗流场中溶液流动,涡流范围的增大。窜流系数的增加有助于流场均匀分布,缓流区流动加快,快速流动区流速降低,在一定程度上可以抑制优势流的发生。

The influence law of the channeling of solution on the meso-flow field in the leaching reactor

In order to explore the effect of channeling flow on the distribution of mesoscopic seepage field inside the leaching pile, the mesoscopic ore accumulation structure in the reactor was obtained based on nuclear magnetic resonance technology, and the seepage field under the influence of channeling flow was numerically simulated by CFD software, and the spray was analyzed The effect of intensity and channeling coefficient on the flow field distribution. The results show that under the effect of channeling, the solution flows slowly inside the ore, the solution exchanges at the ore-liquid interface, the flow velocity at the slow flow zone and the outlet boundary increases, the flow velocity at the high-speed flow zone decreases, and the swirling flow enhances. Under the effect of channeling flow, the increase of spray strength can promote the solution flow in the seepage field, and the vortex range increases. The increase of the channeling coefficient contributes to the uniform distribution of the flow field, the flow in the slow flow area is accelerated, and the flow in the fast flow area is reduced, to a certain extent, the occurrence of dominant flow can be suppressed.