晋北中高硫煤中稀土元素的地球化学特征

Geochemistry of rare earth elements in the middle and high sulfur coals from North Shanxi Province

应用中子活化分析方法,测定了晋北两层中高硫煤中稀土元素的含量。通过对稀土元素的分布模式、相关分析和聚类分析的研究,得出如下认识:成煤环境对稀土元素的含量具有控制作用,但中高硫煤中稀土元素总量会受到沉积期后酸性溶液下渗淋滤作用的影响;同一煤层中各分层的稀土元素应具有基本相同的分布模式,异常的稀土元素分布模式指示了沉积期后地质作用的影响;煤中稀土元素的主要赋存状态为无机相,主要来源为陆源碎屑矿物;煤中与稀土元素伴生的有害元素有V、P、Mo、Cr、Cu、Mo、Th和Cd等,在加工洗选过程中有洁净潜势。

Contents of rare earth elements(REEs )in two coal seams from North Shanxi Pr ovince,China are determined using instrumental neut ron activation method.Based on the REE distribution patterns,the corre lation analysis and cluster analysis,main conclusions are drawn as follows.The REE contents are mainly controlled by the coal-forming environments,but might be affected by acidic solution leaching after the peat sedimentation.The REE distribution patterns should be nearly same in the sublayers of the sa me coal seam or layer,and the occurrence of the abnormal patterns might indicate the geological effect after the post-sedimentation.The REEs in coals occur mainly in the inorganic p hase,and might be mainly derived fro m the terrigenous detrital minerals.Some harmful elements,such as V,P,Mo,Cr,Cu,Th and Cd might have cleanin g potential during the processing of dressing by washing because they are associated with REE.