蒙脱土中镧、钇离子电迁移行为试验研究  

Electromigration Behavior of Lanthanum and Yttrium in Montmorillonite

作　　者：陈静妍 庄艳峰[1] CHEN Jingyan;ZHUANG Yanfeng(School of Civil Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学土木建筑工程学院,武汉430072

出　　处：《河南科学》2024年第3期328-336,共9页Henan Science

摘　　要：为研究蒙脱土对轻稀土离子La^(3+)和重稀土离子Y^(3+)吸附的差异,及外加电场条件下两种离子在蒙脱土中的迁移规律,开展了不同条件下的等温吸附试验、稀土迁移和电渗试验等.研究结果表明,Langmuir等温吸附方程对La^(3+)和Y^(3+)在蒙脱土表面的吸附拟合度较高,与La^(3+)吸附相比,蒙脱土对Y^(3+)的饱和吸附量更高.而在电渗试验中,蒙脱土吸附的La^(3+)和Y^(3+)含量远小于等温吸附试验中所得到饱和吸附量,表明电渗过程中吸附和电迁移是一个相互耦合的过程,且电势梯度为1 V/cm时更利于稀土在蒙脱土中的迁移.此外,基于试验中La^(3+)和Y^(3+)迁移的距离、迁移的电荷占比和迁移所消耗的电能三个因素,分析离子了镧、钇的迁移效率,发现La^(3+)在蒙脱土中的迁移效率高于Y^(3+).试验结果可为稀土矿清洁开采相关研究提供参考.To investigate the variances in adsorption behavior of light rare earth ion La^(3+)and heavy rare earth ion Y^(3+)on montmorillonite,as well as the migration of these ions in montmorillonite under an applied electric field,a series of isothermal adsorption tests,rare earth migration tests,and electroosmosis tests were conducted under varying conditions.The results indicated that the Langmuir isotherm equations provided a better fit for the adsorption of La^(3+)and Y^(3+)on montmorillonite,with the saturated adsorption of Y^(3+)being higher than that of La^(3+).During the electroosmosis test,the adsorption of La^(3+)and Y^(3+)by montmorillonite was significantly lower than the saturation adsorption amounts from the isothermal adsorption test.This discrepancy suggested that adsorption and electromigration in electroosmosis were interconnected processes.Furthermore,a potential gradient of 1 V/cm was found to be more conducive to rare earth migration in montmorillonite.Additionally,the migration efficiency of lanthanum and yttrium was evaluated by considering three factors:the migration distance of La^(3+)and Y^(3+),the charge ratio of migration,and the power consumption for migration.The analysis revealed that the migration efficiency of La^(3+)in montmorillonite surpassed that of Y^(3+).The findings from the tests offer valuable insights for research related to the environmentally friendly extraction of rare earth minerals.

关 键 词：轻稀土 蒙脱土 电渗流 等温吸附 迁移效率 

分 类 号：TQ15[化学工程—电化学工业] TD865[矿业工程—金属矿开采]