Distribution and modes of occurrence of uranium in coals of Eastern Yunnan,China  

作　　者：Xin Wang Qiyan Feng Qingjun Meng Fei Liu Qihang Cao Guijian Liu 

机构地区：[1]College of Life Sciences,Huaibei Normal University,Huaibei 235000,China [2]School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China [3]CAS Key Laboratory of Crust-Mantle Materials and the Environments,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China

出　　处：《International Journal of Coal Science & Technology》2021年第6期1262-1271,共10页国际煤炭科学技术学报（英文）

基　　金：This work was supported by the National Basic Research Program of China(2014CB238903);the National Natural Science Foundation of China(41173032,41371444,41373110);the open project of Anhui Key Laboratory(ZYZWSW2014011);Anhui Provincial Department of Education University Scientific Research Project(KJ2020A1204).We acknowledge editors and reviewers for polishing the language of the paper and for in-depth discussion.

摘　　要：Uranium is an environmentally hazardous element,and is commonly present at trace levels(2.4 μg/g for world coals)in coal deposits.However,selected coal deposits could be highly enriched in uranium.In this study,15 coal samples were collected from Eastern Yunnan coal deposits,China,aiming to characterize the distribution and the occurrence of uranium in those coals.In studied samples,uranium content varied from 0.36 to 8.28 μg/g,with an average value of 3.76 lg/g.Generally,uranium content in coals from northern coal mines(3.02±2.44 μg/g,n=5)were lower than it in southern coal mines(4.13±2.30 μg/g,n=10).Uranium in coal samples showed no obvious correlation with total sulfur,whereas was positively correlated with ash yield.The results of sequential chemical extraction procedure confirm that organic-bound is the dominant occurrence of uranium.The slight enrichment of uranium in studied coals was probably attributed to sedimentation processes,hydrological conditions and tectonic structure of the coal deposits.

关 键 词：COAL URANIUM DISTRIBUTION Eastern Yunnan China 

分 类 号：TD745[矿业工程—矿井通风与安全]