矿石粒径对矿堆内溶液毛细渗流的影响特征

Effect of ore particle size on solution capillary seepage in ore heaps

为探究矿石粒径对矿堆内溶液毛细渗流的影响特征,利用所构建的溶液毛细上升实验装置,针对单一粒径矿堆和混合粒径矿堆,分别开展不同矿石粒径下溶液毛细上升实验,得到了溶液毛细上升高度与时间的关系曲线及相应的拟合方程,分析了溶液上升速度随时间变化规律.研究发现:实验初期矿堆内溶液上升速度较快,随着实验时间的增加,溶液上升速度逐渐减小并最终降为零,且溶液最大上升高度及溶液上升速度均与矿石粒径负相关.矿堆内由毛细作用形成的不可动溶液含量随矿石平均粒径的减小而增大,细颗粒矿石含量过多时在矿堆内将形成大范围的不可动溶液区域,影响矿堆内溶液渗透效果.

To explore the characteristics of the effect of ore particle size on the capillary flow of solution in an ore heap, solution capillary rise experiments of two groups of ore particles, mono-size and non-uniform, were performed with an established capillary rise experimental device. The relationship of solution capillary rise height with time and the corresponding fitting equations were obtained. The regularity of solution rise velocity with time was analyzed. It is found that at the beginning of the experiment, the ore heap solution rises quickly; with the increase of time, the solution rise velocity decreases and eventually drops to zero; the maximum solution rise height and velocity have negative correlation with ore particle size. Immobile solution content inside the ore heap formed by capillary action increases with the decreasing of average particle size, and a wide range area of immobile solution will form when the content of fine particles in the ore heap is too much, which can influence the solution seepage of the ore heap.