离子型稀土矿硫酸镁溶液原地浸矿渗流演化实验研究  

Experimental study on seepage evolution law of ionic rare earth ore in-situ leaching by magnesium sulfatee

作　　者：谭述君 饶运章[1] 张美道 王丹[1] 张世佳 巫辅宇 TAN Shujun;RAO Yunzhang;ZHANG Meidao;WANG Dan;ZHANG Shijia;WU Fuyu(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;School of Civil and Surveying&MappingEngineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]江西理工大学土木与测绘工程学院,江西赣州341000

出　　处：《有色金属科学与工程》2023年第3期416-424,共9页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(51964014)。

摘　　要：对于离子型稀土矿体的原地浸矿,渗流是稀土离子浸出率和浸矿周期的重要控制因素,成为提升浸出效率的关键。本研究以赣州龙南足洞稀土矿块为柱浸实验对象,以硫酸镁溶液作为浸矿液,利用核磁共振、EDTA容量法和数据拟合分析等手段,研究了不同浓度硫酸镁溶液浸矿对离子型稀土矿体孔隙结构、稀土离子浓度及溶液浸出速率的影响,并探讨了原地浸矿过程孔隙结构的演化机理。结果表明:清水浸矿过程对矿体孔隙结构的影响较小,并有少部分大孔隙矿体向小孔隙矿体转变;而硫酸镁溶液浸矿过程对矿体孔隙结构的影响较大,矿体孔隙率先由大孔隙向小孔隙转变,再由小孔隙向大孔隙转变,并且表现出阻碍浸矿液渗流的特点,浓度越大,阻碍作用越显著。最后分别拟合了各硫酸镁浸矿组的浸出稀土离子浓度与平均浸出速率的关系。For in-situ leaching of ionic rare earth ore bodies,seepage is an important controlling factor of rare earth ion leaching rate and leaching cycle and becomes the key to improving leaching efficiency.In this paper,the rare earth ore block from Zudong area(Longnan County,Ganzhou)was taken as the experimental object of column leaching.With magnesium sulfate solution as lixiviant,the effects of magnesium sulfate solution on pore structure,rare earth ion concentration and solution leaching rate of ionic rare earth ore body were studied by NMR,EDTA volumetric method and data fitting analysis,and the evolution mechanism of pore structure during in-situ leaching was discussed.The results show that the water-leaching process has little influence on the pore structure of ore body,and a small number of macropores transform into small pores.In the leaching process,the pore structure of ore body is greatly affected by magnesium sulfate solution,and the porosity first changes from macropores to small pores and then from small pores to macropores with the characteristics of hindering the lixiviant seepage,which increases with concentration.Finally,the relationships between leaching rare earth ion concentration and the average leaching rate of leaching groups with different concentrations were fitted,respectively.

关 键 词：离子型稀土矿体 孔隙结构 离子浓度 浸出速率 

分 类 号：TD865[矿业工程—金属矿开采]