煤及顶板中稀土元素赋存状态及逐级化学提取  

Occurrence and Sequential Chemical Extraction of Rare Earth Element in Coals and Seam Roofs

作　　者：代世峰[1,2] 任德贻[1,2] 李生盛 

机构地区：[1]中国矿业大学资源开发工程系 [2]煤炭资源教育部重点实验室,北京100083

出　　处：《中国矿业大学学报》2002年第5期349-353,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金 (4 0 0 72 0 5 4);煤炭科学基金 (97地 10 2 0 5 )资助项目

摘　　要：用逐级化学提取的方法研究了石炭井、石嘴山和峰峰矿区煤层及顶板中稀土元素的存在形态 ;根据稀土元素的特性 ,把稀土元素分为水溶态 ( )、可交换态 ( )、碳酸盐结合态 ( )、有机态 ( )、硅铝化合物结合态 ( )和硫化物结合态 ( ) .研究表明 ,无论是煤中还是顶板中的稀土元素主要赋存在硅铝化合物结合态中 ;水溶态和可交换态中稀土元素含量甚微 ,是稀土元素地球化学性质稳定的表现之一 .高含量的碳酸盐矿物、硫化物矿物和有机质亦对稀土元素的赋存状态起了一定作用 .在煤层顶板中 ,以硅铝化合物和硫化物结合态的稀土元素含量随着原子序数的增加而减少 ,以有机质结合态的稀土元素随着原子序数的增加而增加 ,且和煤层中稀土元素的赋存状态不同 ,表明不同沉积环境以及相同沉积环境对不同物质中的稀土元素的分馏效应是不同的 .The occurrence of rare earth elements (REEs) in coal seams and roofs from Shitanjing, Shizuishan, and Fengfeng coalfields were studied using Sequential Chemical Extraction Experiment (SCEE) in different extraction liquids and conditions. There are 6 types of REEs in coals and seam roofs: water\|soluble state (Ⅰ), ion\|exchangeable state(Ⅱ), carbonate state(Ⅲ), organism\|bonded state(Ⅳ), sialic state(Ⅴ),and sulfide state(Ⅵ). The result shows that REEs mainly distribute in sialic state. The fact that there is less water\|soluble state and ion\|exchangeable state in both coal and seam roof is the reflectance of stable geochemistry characteristics of REEs. The relative high content of carbonate mineral, sulfide mineral and organic matter may play an certain role in REE distribution and occurrence. The content of REEs in sialic state and sulfide state decreases with the increase of atomic numbers, but the REE content in organism\|bonded state increases. The fact that the occurrences of REEs in seam roofs is different from those in coals indicates that the fractional effects of REEs in different sedimentary environment, or of different materials in the same environment, are different.

关 键 词：稀土元素 逐级化学提取实验 赋存状态 煤 煤层顶板 沉积环境 分馏效应 

分 类 号：P618.11[天文地球—矿床学] P59[天文地球—地质学]