离子吸附型稀土原地浸析尾矿中稀土和铵的残留量分布及其意义

发布时间：2018-07-17 04:21

【摘要】：测定了龙南足洞原地浸析多年后的尾矿中不同空间位置上的稀土和铵残留量,以及尾矿中的粘土矿物对稀土和铵的吸附等温线。结果表明,粘土矿物对稀土的吸附符合朗格缪尔等温线方程,对低浓度稀土有强吸附能力;而对铵的吸附等温线呈直线关系,不符合朗格缪尔等温线方程。尾矿粘土中铵的纯水浸出实验证明,尾矿中的铵可被水浸出而流失。用粘土矿物对稀土和铵的吸附特征差别和矿层内部的渗透特征差别解释了注液区域矿层内部从全风化层到半风化层方向铵和稀土残留量的上升趋势。因此,尾矿中铵和稀土含量的分布可以直接反映原地浸出效果的好坏以及铵的流失情况,用于讨论离子吸附型稀土矿床的内部结构与渗流特征。
[Abstract]:The contents of rare earth and ammonium residues in tailings at different spatial positions after in situ leaching in Longnan Zhudong and the adsorption isotherms of rare earth and ammonium on clay minerals in tailings were determined. The results show that the adsorption of rare earth on clay minerals accords with Langmuir isotherm equation and has strong adsorption ability for low concentration rare earths, but the adsorption isotherm of ammonium is linear and does not accord with Langmuir isotherm equation. The pure water leaching experiment of ammonium in tailings clay proves that ammonium in tailings can be leached by water. The difference of the adsorption characteristics of rare earth and ammonium and the difference of permeability in the ore bed are used to explain the increasing trend of ammonium and rare earth residues in the ore bed from the total weathering layer to the semi-weathered layer in the liquid injection area. Therefore, the distribution of ammonium and rare earth in tailings can directly reflect the effect of in-situ leaching and the loss of ammonium, which can be used to discuss the internal structure and percolation characteristics of ion adsorbed rare earth deposits.
【作者单位】：南昌大学稀土与微纳功能材料研究中心;
【基金】：科技部973计划课题(2012CBA01204) 支撑计划课题(2012BAE01B02) 国家自然科学基金(51274123)
【分类号】：TD926.4

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