摘要
本文指出除了通常认为的蒙脱石类粘土矿物能吸附较多铀之外、埃洛石也能较多地吸附铀.文中介绍了含铀埃洛石的特征.实验表明埃洛石有膨胀性.埃洛石不但能够由其表面吸附铀,铀也能以铀酰(UO_2)^(2+)方式进入埃洛石的层间.在不同的地质条件下形成不同的富铀粘土矿物.富铀蒙脱石是在碱性环境中形成的,而在中酸性环境中就形成富铀埃洛石.
It is well know that clay minerals such as montmorillonite or interstratified montmorillonite strongly absorb dissolved uranyl species. This paper presents that halloysite could also absorb more uranium and is main uraniferous mineral in some economic uranium deposits. By use of electron microscope, X-ray diffraction , and infrared spectroscopy, characteristics of uraniferous halloysite is described and recognized. The results showed that the structural layers of halloysite were changed because of the penetrating and uptaking of uranyl species. The conclusion is that uranly species not only be absorbed by the surface of halloysite but penetrated into structrual layers of halloysite ?Under the different geological conditions, The various clay minerals with high .uranium could be formed: montmorillonite or interstratified montmorillonite formed in the alkaline environment, while halloysite formed in the neutro-acid environment.
出处
《沉积学报》
CAS
CSCD
北大核心
1989年第3期121-128,共8页
Acta Sedimentologica Sinica
