四川牦牛坪稀土矿矿坑水纳米颗粒特征及启示

Characteristics of Nanoparticles in Pit Water of the Maoniuping REE Minein Sichuan Province and their Revelations

为证实稀土元素可以以纳米颗粒的形式存在于水体中,选取四川牦牛坪稀土矿区矿坑水为研究对象,对矿坑水中的纳米颗粒进行了高分辨率透射电镜单颗粒分析。结果表明,四川牦牛坪稀土矿坑水中含有大量(含)稀土纳米颗粒和其他类型纳米颗粒。其中,(含)稀土纳米颗粒成分主要为C、F、La、Ce,其他类型的纳米颗粒含O、S、C、Al、Si、K等元素。研究结果首次证明了稀土元素在矿坑水中可以纳米颗粒的形式存在,同时,(含)稀土纳米颗粒成分与矿区稀土矿体(氟碳铈矿、萤石)成分类似,能够反映矿体的成分信息,进而为利用矿坑水中的纳米颗粒研究矿体提供了有力支撑。此外,稀土矿坑水中的纳米颗粒携带有一些有毒元素,可能会影响矿区的生态系统,因此应该对稀土矿床矿坑水中的纳米颗粒加以关注。

In order to verify if the REE could be occurred in form of nanoparticles in the aqueous solution,nanoparticles of the pit water collected from pits of the Maoniuping REE Mine in Sichuan Province have been analyzed by using the high-resolution transmission electron microscope.The results show that there are a large amount of REE-bearing or REE nanoparticles and other types of nanoparticles in the pit water of the Maoniuping REE Mine.Especially,REE-bearing or REE nanoparticles are mainly composed of C,F,La,and Ce,while other types of nanoparticles contain F,S,C,Al,Si,K,and other elements.This research has proved that the REE can be existed as nanoparticles in the pit water for the first time.Meanwhile,the compositions of REE-bearing or REE nanoparticles are similar to those of minerals of ore bodies(bastnaesite and fluorite)in the mine.Thus,nanoparticles in the pit water of the mine can reveal the compositional information of ore bodies which can provide a strong support for doing research on the characteristics of ore bodies in the mine.In addition,some toxic elements which are carried by nanoparticles in the pit water of the REE mine could affect the ecosystem in the mining area.Therefore,more attentions should be paid on the research of nanoparticles in the pit water of the REE mine.