Unsaturated flow and solute transport in a porous column using spherical ore particles  

作　　者：Xiu-xiu Miao Ai-xiang Wu Bao-hua Yang Jin-zhi Liu Sheng-hua Yin Hong-jiang Wang 

机构地区：[1]Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education), University of Science and Technology Beijing [2]School of Information Science and Engineering, Hunan International Economics University [3]College of Information Technology, Shanghai Ocean University

出　　处：《International Journal of Minerals,Metallurgy and Materials》2014年第2期113-121,共9页矿物冶金与材料学报（英文版）

基　　金：financially supported by the NationalNatural Science Foundation of China(Nos.50934002,51104100,and 51074013);the National Key Technologies R&D Program of China(No.2012BAB08B02)

摘　　要：This paper dealt with the development of a two-dimensional （2D） mathematical model for column leaching and confirmed the important simulation parameters through experiment. The unsaturated state of the variably saturated flow column and the solute transport of copper ions were studied during leaching. The fluid flow problem was handled using the Richards equation on the premise of an ambient pressure column air, where the van Genuchten formulas were applied to define the nonlinear relationships of pressure head with the retention and permeability properties. The ore column permeability test gave a varied hydraulic conductivity, which was analyzed in the model. In the solute transport problem, the copper ion concentration was solved using the advection-diffusion-reaction equation whose reaction term was determined by the joint analysis of experimental copper leaching rate and the shrinking core model. Particle-and column-scale leaching tests were carried out to illustrate the difference and connection of copper extraction in both processes. This fluid flow and solute transport cou-pled model was determined through the finite element method using the numerical simulation software, COMSOL Multiphysics.This paper dealt with the development of a two-dimensional （2D） mathematical model for column leaching and confirmed the important simulation parameters through experiment. The unsaturated state of the variably saturated flow column and the solute transport of copper ions were studied during leaching. The fluid flow problem was handled using the Richards equation on the premise of an ambient pressure column air, where the van Genuchten formulas were applied to define the nonlinear relationships of pressure head with the retention and permeability properties. The ore column permeability test gave a varied hydraulic conductivity, which was analyzed in the model. In the solute transport problem, the copper ion concentration was solved using the advection-diffusion-reaction equation whose reaction term was determined by the joint analysis of experimental copper leaching rate and the shrinking core model. Particle-and column-scale leaching tests were carried out to illustrate the difference and connection of copper extraction in both processes. This fluid flow and solute transport cou-pled model was determined through the finite element method using the numerical simulation software, COMSOL Multiphysics.

关 键 词：mathematical models LEACHING unsaturated flow solute transport 

分 类 号：TD952[矿业工程—选矿] TD925