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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。
In order to investigate the basic characteristics of lithium adsorption from clay minerals, the adsorption reaction of montmorillonite and kaolinite with synthetic Li-containing artificial seawater (ρ (Li) = 1.4mg / L) was carried out at room temperature to investigate the adsorption equilibrium time , PH and water-rock ratio on the adsorption. The experimental results show that both montmorillonite and kaolinite and lithium solution reach adsorption equilibrium within 2 h. When the pH was raised from 4 to 8, the amount of kaolinite adsorbed to lithium increased from 33.2 μg / g to 72.4 μg / g. When pH> 8, the amount of kaolinite adsorption to lithium began to decrease. Water-rock ratio significantly affects the adsorption capacity of kaolinite. The ratio of water to rock varied from 50 mL / g to 100 mL / g and 200 mL / g, and the adsorption increased from 25.2 μg / g to 58.8 μg / g and 142.6 μg / g. This shows that the amount of kaolinite used and the experimental solution to achieve adsorption equilibrium can be used to study the experimental adsorption of lithium isotope fractionation characteristics.