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高岭石和埃洛石-7Å对稀土元素吸附特征的实验研究
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国家自然基金青年基金项目（41302030）；中国地质科学院基本科研业务费项目（YYWF201619）；中国地质调查项目（DD20179152）；河北省教育厅项目（QN2015091）


An experimental study of the characteristics of REE adsorption of kaolinite and halloysite-7Å
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    摘要:

    针对赣南风化淋积型稀土矿中稀土元素的分异现象，通过研究该稀土矿的主要矿物成分——高岭石和埃洛石-7Å的矿物特征及其在不同条件下的吸附特征，探讨了该类型稀土矿的成矿机制和稀土元素分异机理。高岭石和埃洛石-7Å吸附稀土元素的能力受体系pH值以及金属阳离子钾、钠的的影响，且埃洛石-7Å吸附稀土元素的能力高于高岭石。横向对比实验结果表明当体系中赋存有K+时，两种粘土矿物对稀土元素的吸附呈现出分化趋势，其中高岭石主要吸附中-重稀土元素，埃洛石-7Å反之，因此风化淋积型稀土矿风化过程中释放出的K+可能会使高岭石和埃洛石-7Å呈现出差异吸附特征，进而反过来影响稀土矿中稀土元素的配分。

    Abstract:

    This paper is mainly aimed at studying the differentiation phenomenon of rare earth elements in the weathered crust elution-deposited rare earth ore. Through the study of the mineral characteristics and adsorption of kaolinite and halloysite-7Å, the authors simulated the process of adsorption of rare earth elements, and investigated the genesis of the deposit. According to the results of the experiments, the adsorption capacity of halloysite-7Å for rare earth elements is far greater than that of kaolinite. In addition, when the pH of the system is lower than the point of zero charge of the two minerals or there are metallic cations in the system, the adsorption capacities of both minerals are greatly affected. The results of lateral comparison experiments suggest that, regardless of the change of pH or the addition of Na+ in the system, kaolinite and halloysite-7Å will not show the characteristics of adsorption dissimilarity, and the adsorption patterns of rare earth elements are relatively similar. Only when K+ is inside the system, the adsorption patterns of both clay minerals for rare earth elements show divergence, of which MREE and HREE are mainly adsorbed by kaolinite while LREE are mainly adsorbed by alloysite-7Å. Therefore, K+ produced by weathering of rocks causes kaolinite and halloysite-7Å to exhibit selective adsorptions, which further affects the distribution of REE in the REE deposit.

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高瑜鸿,范晨子,许虹,等, 2018. 高岭石和埃洛石-7Å对稀土元素吸附特征的实验研究[J]. 岩石矿物学杂志, 37(1):161~168.
GAO Yu-hong, FAN Chen-zi, XU Hong, et al, 2018. An experimental study of the characteristics of REE adsorption of kaolinite and halloysite-7Å[J]. Acta Petrologica et Mineralogica, 37(1): 161~168.

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  • 收稿日期:2017-08-17
  • 最后修改日期:2017-10-25
  • 在线发布日期: 2018-01-13
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