陕南石煤稀土元素地球化学特征  

Geochemical Characteristics of Rare Earth Elements in Stone Coal in Southern Shaanxi Province

作　　者：张卫国[1,2,3] 李焕同 吕婷婷[3] 杨杰 罗俊 ZHANG Wei-gu;LI Huan-tong;LYU Ting-ting;YANG Jie;LUO Jun(College of Geology and Environment,Xi'an University of Science and Technology,X'an 710054,China;Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation,Xi'an 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xi'an 710021,China)

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054 [2]陕西省煤炭绿色开发地质保障重点实验室,陕西西安710054 [3]自然资源部煤炭资源勘查与综合利用重点实验室,陕西西安710021

出　　处：《稀土》2019年第5期63-72,共10页Chinese Rare Earths

基　　金：国家自然科学基金项目(41802187和41502160);陕西省教育厅科研计划项目(18JK0521);陕西省煤炭绿色开发地质保障重点实验室基础研究计划项目(MTy2019-09)

摘　　要：石煤因伴生有多种稀有金属元素而备受关注,石煤的稀土元素地球化学特征一直是研究重点。我国陕南石煤分布广泛且储量丰厚,本次研究测试了17个采自陕南的石煤、夹矸、煤灰样品的工业分析指标和稀土元素含量,结果显示陕南石煤具有低水、高灰、高硫、挥发分产率变化大的特点。分别对比了石煤、夹矸、煤灰中的稀土元素含量与中国煤均值、世界煤均值,总结了陕南不同类型样品中稀土元素含量特点。从稀土元素地球化学参数和标准化分布曲线特征分类探讨了陕南石煤稀土元素地球化学特征,认为不同地区和年代的石煤稀土元素标准化分布模式差别较大,可供比对性差。煤灰样的稀土元素标准化分布模式与对应原煤样分布曲线形态相似,表明石煤中稀土元素在煤燃烧过程中同等程度的富集到煤灰里。相比对应煤层样,夹矸样总体呈现富集稀土元素特征,其中轻稀土富集程度更高,重稀土富集程度次之。The geochemical characteristics of rare earth elements in stone coal have been the focus of research.The stone coal in Southern Shaanxi is abundant and widely distributed.In this study,17 samples of stone coal,gangue and coal ash from Southern Shaanxi were tested for their industrial analysis indexes and rare earth element contents.The contents of rare earth elements in stone coal,gangue and coal ash were compared with the mean values of China coal and world coal respectively,and the content characteristics of rare earth elements in different types of samples in Southern Shaanxi were summarized.The geochemical characteristics of rare earth elements in stone coal in Southern Shaanxi are discussed from the geochemical parameters and characteristics of standardized distribution curve of rare earth elements.The standardized distribution pattern of rare earth elements in coal ash samples is similar to that of the corresponding raw coal samples,indicating that rare earth elements in stone coal are equally enriched in coal ash during coal combustion.Compared with the corresponding coal seam samples,gangue samples generally show the characteristics of rare earth element enrichment,in which light rare earth enrichment level is higher than that of heavy rare earth.

关 键 词：陕南 石煤 稀土元素 地球化学 

分 类 号：P595[天文地球—地球化学]