基于渗流-化学-应力多场耦合的砂岩型铀矿CO_(2)+O_(2)地浸开采的数值模拟  

Numerical Simulation of CO_(2)+O_(2)In-situ Leaching of Sandstone Type Uranium Deposit Based on Multifield Coupling of Seepage-Chemistry-Stress

作　　者：牛庆合 何佳彬 王伟[1,2,3] 苏学斌 周根茂[5] 赵利信 袁维 常江芳 胡明伟 NIU Qing-he;HE Jia-bin;WANG Wei;SU Xue-bin;ZHOU Gen-mao;ZHAO Li-xin;YUAN Wei;CHANG Jiang-fang;HU Ming-wei(Key Laboratory of Roads and Railway Engineering Safety Control(Shijiazhuang Tiedao University),Ministry of Education,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines,Shijiazhuang 050043,China;Beijing Research Institute of Chemical Engineering and Metallurgy,Beijing 101149,China;Xinjiang Tianshan Uranium Co.,Ltd.,CNNC,Yi'ning 835000,China)

机构地区：[1]道路与铁道工程安全保障教育部重点实验室(石家庄铁道大学),石家庄050043 [2]省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [3]河北省金属矿山安全高效开采技术创新中心,石家庄050043 [4]核工业北京化工冶金研究院,北京101149 [5]新疆中核天山铀业有限公司,新疆伊宁835000

出　　处：《有色金属（冶炼部分）》2023年第6期144-152,共9页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金-核技术创新联合基金资助项目(U1967208);国家自然科学基金面上项目(51979170);河北省自然科学基金资助项目(E2021210128)。

摘　　要：为探明不同影响因素对CO_(2)+O_(2)地浸采铀效果的影响规律和影响机理,首先建立了适合CO_(2)+O_(2)地浸的渗流-化学-应力多场耦合数值模型,其次,结合实际现场工况,开展了注液速率、渗透率、O_(2)配加浓度、HCO3-配加浓度和铀矿石平均品位对CO_(2)+O_(2)地浸采铀影响的数值模拟研究。研究表明:CO_(2)+O_(2)地浸过程中,抽液井铀浓度呈现“缓慢上升-快速上升-缓慢下降-趋于稳定”的阶段性变化趋势;矿层渗透率、铀矿石平均品位、O_(2)配加浓度、HCO3-配加浓度与抽液井铀浓度呈现线性正相关关系,溶浸液的注入速率与抽液井铀浓度呈现线性负相关关系;CO_(2)+O_(2)地浸过程中应该选择初始渗透率大且铀品位高的矿层,同时应该适当加大O_(2)和HCO3-的配加浓度,并控制好溶浸液注入速率,可实现铀资源的高效开采。本研究对CO_(2)+O_(2)地浸矿层的选择和地浸工艺的优化具有重要的指导意义。In order to explore the influence law and mechanism of different influencing factors on CO_(2)+O_(2)in-situ leaching effect of uranium deposits,firstly,a multi-field coupling numerical model of seepage-chemistry-stress suitable for CO_(2)+O_(2)in-situ leaching was established,and then,combined with the actual site conditions,the numerical simulation study of the influences of liquid injection rate,permeability,O_(2)addition concentration,HCO3-addition concentration,and uranium ore average grade on CO_(2)+O_(2)in-situ leaching uranium were carried out.The results show that during the CO_(2)+O_(2)in-situ leaching process,uranium concentration in pumped well indicates a phased change trend of"slow rise,rapid rise,slow decline,and stabilize".The permeability of ore seam,average grade of uranium ore,O_(2)addition concentration,and HCO3-addition concentration show a positive linear correlation with uranium concentration of pumping well,and the injection rate of leaching solution shows a negative linear correlation with uranium concentration of pumping well.During the CO_(2)+O_(2)in-situ leaching process,uranium deposits with large initial permeability and high uranium grade should be selected,the concentration of O_(2)and HCO3-should be appropriately increased,and the injection rate of leaching solution should be controlled to achieve efficient exploitation of uranium resources.This study has important guiding significance for site selection and parameter optimization of CO_(2)+O_(2)in-situ leaching process.

关 键 词：CO_(2)+O_(2) 地浸采铀 多场耦合 数值模拟 

分 类 号：TL212.12[核科学技术—核燃料循环与材料]