Dynamic experiment and numerical simulation of solute transmission in heap leaching processing

Solute transmission in saturated ore heap was studied numerically and experimentally. The convection-diffusion equation (CDE) used to describe the mass transportation in porous media was solved by characteristic difference method to give the distribution of the concentration of ferrous ion in the ore column. To calibrate the computational model, a column test was performed using infiltration of sulfide ferrous solution (the initial concentration is c0=0.04 mol/L) on a 100 cm high column composed of ore particles smaller than 10 mm for 2.5 h. The numerical analysis shows that the results obtained from numerical modeling under the same operating conditions as used for column test are in good agreement with those from experimental procedure on the whole trend, which indicates that the model, the numerical method, and the parameters chosen can reflect the rule of ferrous ion transmission in ore heap.

Fractal analysis of granular ore media based on computed tomography image processing

九组矿石样品的代表性的图象被 X 光检查获得计算断层摄影术(CT ) 扫描仪。基于 CT 图象分析，稳固的矩阵的分数维的尺寸，毛孔空格和每件样品的矩阵 / 毛孔接口被使用框数测量方法。有粒子尺寸，孔，和渗出物系数的三种分数维的尺寸的关联被调查。结果证明为这些样品的所有图象，矩阵阶段有最高的尺寸，由矩阵毛孔接口的毛孔阶段，和尺寸列在后面有最小的价值；当毛孔阶段的尺寸与孔断然并且线性地联系时，矩阵阶段和矩阵毛孔接口的尺寸否定地并且线性地与孔被相关；矩阵毛孔接口的分数维的尺寸与渗出物系数否定地并且线性地联系。矩阵 / 毛孔接口的更大的分数维的尺寸为解决方案流动显示更不规则的复杂隧道，导致低渗透。