溶浸液对离子型稀土饱和-非饱和渗透特性的影响  

Effect of Leaching Solution on Saturated-unsaturated Permeability of Ionic Rare Earth

作　　者：郭钟群[1] 周可凡 周尖荣 刘凌峰 唐韬 王晓军 GUO Zhongqun;ZHOU Kefan;ZHOU Jianrong;LIU Lingfeng;TANG Tao;WANG Xiaojun(School of Civil Engineering and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Key Laboratory of Mining Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学土木与测绘工程学院,江西赣州341000 [2]江西理工大学江西省矿业工程重点实验室,江西赣州341000

出　　处：《有色金属工程》2023年第4期66-77,共12页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52004106,52174113);江西省自然科学基金资助项目(20224BAB214035)。

摘　　要：在离子型稀土原地浸矿过程中,矿体的渗透特性对于资源浸取速率具有重要影响。利用变水头法研究不同溶浸液作用下离子型稀土的饱和渗透系数,分析溶浸液种类和浓度对饱和渗透系数的影响。通过Geo-Experts压力板仪系统研究溶浸液分别为纯水、3%(NH_(4))_(2)SO_(4)、3%MgSO_(4)时,离子型稀土的含水率与基质吸力的关系。基于Van Genuchten模型和Fredlund&Xing模型,探讨溶浸液种类和浓度对离子型稀土矿体的非饱和渗透系数的影响。结果表明:离子型稀土的饱和/非饱和渗透系数从大到小依次为纯水、3%(NH_(4))_(2)SO_(4)、3%MgSO_(4);当溶浸液的浓度不同时,离子型稀土饱和渗透系数先增大后减小;当矿体为非饱和状态时,基质吸力是影响非饱和渗透系数的重要因素,在相同基质吸力下,非饱和渗透系数随着溶浸液的浓度增加而减小。研究结果可以为注液参数设计提供理论指导,有助于完善离子型稀土原地浸矿理论。In the process of in-situ leaching of ionic rare earth,the permeability of ore body is significant for the leaching rate of resources.The saturated permeability experiment of ionic rare earth under different leaching conditions was studied by variable head method,and the influence of leaching solution type and concentration on saturated permeability coefficient was analyzed.The relationship between the water content of ion-type rare earth and matrix suction was studied by Geo-Experts pressure plate instrument when the solution was pure water,3%(NH_(4))_(2)SO_(4),3%MgSO_(4),respectively.Based on Van Genuchten model and Fredlund&Xing model,the effect of leaching solution type and concentration on unsaturated permeability of ionic rare earth orebody is discussed.The results show that the saturated/unsaturated permeability coefficients of ion-type rare earth from large to small are pure water,3%(NH_(4))_(2)SO_(4),3%MgSO_(4).The saturated permeability coefficient of ion rare earths increases first and then decreases.When the ore body is unsaturated,the matrix suction is an important factor affecting the unsaturated permeability coefficient due to the existence of matrix suction.Under the same matrix suction,the unsaturated permeability decreases with the increase of the concentration of leaching solution.The research not only provide theoretical guidance for the design of injection parameters of in-situ leaching,but also is helpful to improve the efficient mining of ion-type rare earth.

关 键 词：离子型稀土 原地浸矿 土-水特征曲线 饱和渗透 非饱和渗透 

分 类 号：TF11[冶金工程—冶金物理化学]