原地溶浸开采中的多过程耦合作用与反应前锋运动:2.数值模拟

MULTIPLE PROCESSES COUPLING AND REACTION FRONT PROPAGATION DURING IN-SITU LEACH MINING:2. NUMERICAL SIMULATION

基于流体流动、溶解反应、孔隙度变化、质量守恒等机理建立了原地溶浸开采的多过程耦合与反馈的动力学模型,并编制了模拟程序。应用该模型和程序可以对原地溶浸开采过程中反应前锋的运动进行数值模拟。以用硫酸和氧化剂配制的溶液作溶浸剂的原地溶浸采铀为例,数值模拟结果表明,无论是在均匀孔隙岩石中还是在非均匀孔隙岩石中都可产生复杂形态的反应前锋运动,反应前锋的运动特征和形态稳定性与流体流速和模拟区域大小有关。反应前锋的动力学模拟与研究在原地溶浸采铀的生产和技术研究中有重要意义和应用前景。

Based on fluid flow, dissolution reaction, porosity change and mass conservation, a dynamic model for in-situ leach mining is established that accounts for multiple processes coupling and feedback. A program is compiled in Fortran and C^(++). Using this model and program the movement of reaction front during in-situ leach mining can be simulated numerically. An example of in-situ leach uranium mining using H_2SO_4 and oxidant as lixiviant is presented. The results of numerical simulation show that complex reaction front morphologies can occur in both homogeneous porous media and heterogeneous porous media, the movement character and morphological stability of reaction front are related to fluid velocity and domain. The dynamic simulations and researches of reaction front would have important significances and application prospects for in-situ leach uranium mining.