不同浸矿剂对离子型稀土再吸附行为的影响  

Effect of different leaching agents on re-adsorption behavior of ionic rare earths

作　　者：丁鹏杰 胡凯建 李立浩 叶文强 汪豪 DING Pengjie;HU Kaijian;LI Lihao;YE Wenqiang;WANG Hao(Jiangxi Provincial Key Laboratory of Safe and Efficient Mining of Rare Metal Resources,Ganzhou 341000,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]稀有金属资源安全高效开采江西省重点实验室,赣州341000 [2]江西理工大学资源与环境工程学院,赣州341000

出　　处：《江西冶金》2024年第5期327-335,共9页Jiangxi Metallurgy

基　　金：国家自然科学基金项目(51904119,51874148,52174113);江西省教育厅科学技术研究项目(GJJ180475);江西省“双千计划”资助项目(jxsq2019201043)。

摘　　要：离子型稀土矿在原地浸出过程中,浸出母液在流经未浸出区域或无矿层时,稀土离子又被再吸附至矿土颗粒表面,导致浸出母液稀土离子浓度降低,影响了稀土浸取效率。本研究围绕不同浸矿剂对离子型稀土再吸附行为的影响,研究了采用不同浓度与阳离子价态的浸矿剂溶液浸矿时,溶液流动过程、浸出液浓度变化规律及再吸附质量大小。基于核磁共振技术得到土体T2图谱,分析大孔隙数量变化规律,探明不同浸矿剂在稀土离子再吸附时的作用机制。结果表明,浸矿剂浓度越高,非均匀流动现象越明显,浓度峰值越大,稀土离子再吸附质量越小;与硫酸铵、硫酸镁相比,硫酸铝溶液浸矿时,非均匀流动现象最明显,浸矿时最快达到浓度峰值,稀土离子再吸附质量最小。随着浸矿剂浓度增大,试样内部大孔隙数量逐渐减少;与硫酸铵、硫酸镁相比,硫酸铝溶液浸矿时,试样内部大孔隙数量最多。最优浸矿剂浓度为8 g/L,离子价态为+3价。In the in-situ leaching of ionic rare earth ores,when leaching mother liquor flows through regions that have not been leached or through barren layers,rare earth ions are subjected to re-adsorption onto the surfaces of mineral soil particles.This leads to a reduction in the concentration of rare earth ions in the leaching solution,thereby impacting the efficiency of rare earth extraction.This paper focuses on the influence of different leaching agents on the re-adsorption behavior of ionic rare earth.It researches the flow dynamics of leaching solutions with different concentrations and valences of cations,the patterns of leachate concentration changes,and the extent of re-adsorption mass during the leaching process.Utilizing nuclear magnetic resonance(NMR)technology to obtain the T2 patterns of soil,this study analyzes the regularities in the variation of macropore quantities.It elucidates the mechanisms of action of different leaching agents during the re-adsorption of rare earth ions.The results show that the higher the concentration of leaching agent,the more obvious the non-uniform flow phenomenon,the larger the concentration peak,and the smaller the re-adsorption mass of rare earth ions.Compared with ammonium sulfate and magnesium sulfate,the non-uniform flow phenomenon of aluminum sulfate solution is the most obvious,the concentration peak is the fastest,and the re-adsorption quality of rare earth ions is the least.With the increase of leaching agent concentration,the number of macropores in the sample decreases gradually.Compared with ammonium sulfate and magnesium sulfate,the aluminum sulfate solution has the largest number of macropores in the sample.The optimal concentration of the leaching agent is 8 g/L,and the ionic valence state is+3.

关 键 词：离子型稀土矿 再吸附 浓度与价态 孔隙 

分 类 号：TD865[矿业工程—金属矿开采]