摘要
为探讨粘土矿物从溶液中吸附锂的基本特征,选取蒙脱石和高岭石与合成的含锂人工海水(ρ(Li)=1.4mg/L)在室温下进行吸附反应,探讨其吸附平衡时间、pH和水岩比对吸附的影响。实验结果表明蒙脱石和高岭石与锂溶液在2 h内均达到吸附平衡。pH从4升高至8时,高岭石对锂吸附的量从33.2μg/g升高到72.4μg/g。而pH>8时,高岭石对锂吸附的量开始减小。水岩比明显的影响到高岭石的吸附能力。水岩比从50mL/g变化到100 mL/g和200 mL/g,其吸附量从25.2μg/g增加到58.8μg/g和142.6μg/g。这说明所用高岭石量足够与实验溶液达到吸附平衡,可以用本实验来研究吸附过程的锂同位素分馏特征。
This paper studied the characteristics of adsorbing lithium from mixture solution by clay minerals.One montmorillonite sample from United States and one kaolinite sample from Suzhou Province,China were selected and tested at room temperature with lithium solution,which had the similar major ion contents to seawater but with a much higher concentration of Li about,1.4×10-6 mg/L.The equilibrium time,influences of pH and water-rock ratio to the adsorption were tested.The equilibrium time of the montmorillonite and kaolinite with the lithium solution were 2 h.Content of Li adsorbed onto the kaolinite increased from 33.2 μg/g to 72.4 μg/g with increasing pH of the solution from 4 to 8.Adsorbed quantity of Li onto the kaolinite began to decrease with pH higher than 8.The water-rock ratio can clearly influence the adsorbed quantity of Li onto the kaolinite.The adsorbed quantity increased from 25.2 μg/g to 58.8 μg/g,and then to 142.6 μg/g with increasing water/rock ratio from 50 mL/g to 100 mL/g,and then to 200 mL/g,respectively.This implies that the amount of kaolinite which was used in this study is enough to react with the lithium-bearing solution.The experiment in this study can be used for researches on isotopic fractionation of lithium during adsorption.
出处
《矿物学报》
CAS
CSCD
北大核心
2011年第2期291-295,共5页
Acta Mineralogica Sinica
基金
国家自然科学基金(批准号:40773006)
关键词
蒙脱石
高岭石
吸附作用
锂离子
montmorillonite
kaolinite
adsorption
lithium
