高岭土吸附稀土元素的实验研究  

Experimental Study of Sorption of Lanthanides on Kaolin

作　　者：万鹰昕[1,2] 刘丛强[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室 [2]北京联合大学应用文理学院,北京100083

出　　处：《中国稀土学报》2004年第4期507-511,共5页Journal of the Chinese Society of Rare Earths

基　　金：中国科学院重要方向项目(KZCX2-105);国家杰出青年基金资助项目(49625304)

摘　　要：为更好了解粘土矿物对稀土元素(REE)的吸附及其控制因素,进行了不同溶液介质条件(平衡时间、REE含量、pH=3～6.5)1 g·L-1高岭土对REE吸附的系列实验。结果表明:稀土在较短时间内(24 h)吸附/解吸过程达到平衡;Langmuir吸附等温线能模拟REE在高岭土上的吸附,总的趋势是REE含量越高,分馏越不明显;此外,pH对REE吸附和分馏有很大影响,REE分配系数随pH值增加而增加,且在pH近中性时,出现了明显的重稀土比轻稀土更多的被吸附。For a better understanding of adsorption of rare earth elements (REE) in minerals and its controlling factors, adsorption experiments were performed at different solution condition (time, REE concentration, pH) with 1 g · L - 1 Kaolin. REE get equilibrium in 24 h, and Langmuir adsorption curve can model sorption of Ln on Kaolin. The general trend is the fractionation between REEs which is less obvious in high REE concentration than low REE concentration. Furthermore, there is significant effect of pH on the adsorption and fractionation of REE on Kaolin. REE distribution coefficient increases as solution pH increases, and heavy REE enrichment are is and more significant when solution pH increases.

关 键 词：土壤学 高岭土 吸附 分配系数 稀土 

分 类 号：O614.33[理学—无机化学]