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.
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