豫西裴沟矿二叠系构造煤中稀土元素分布与赋存特征

Distribution and occurrence of REE in the Permian tectonically deformed coals from the Peigou Mine,western Henan Province

煤中稀土元素(REE)可以提供丰富的沉积环境与物源信息,同时也是潜在的稀土元素矿产资源。运用电感耦合等离子体质谱仪(ICP-MS)、场发射扫描电镜(SEM)、X射线荧光光谱方法(XRF)和X射线衍射方法(XRD),对豫西裴沟矿二_1煤层中稀土元素含量、分布与赋存特征进行了研究。结果表明,该煤层(50)REE含量范围为22.15~278.45μg/g,平均为90.68μg/g;稀土元素的赋存与无机组分相关,与黏土矿物特别是高岭石关系最为密切;稀土元素在不同分层样品中的含量差异显著,成煤后剧烈的构造运动和煤体变形对稀土元素的含量与分布没有明显影响;部分煤分层中稀土元素的含量已经达到工业开采品位,具有潜在的开发利用前景。

REE geochemistry of coal can provide abundant depositional environment information and coal seams are important potential REE resources. So, the concentration, distribution and occurrence of REEs in No.2-1 coal seam of the Peigou Mine, western Henan Province were investigated using inductively couple-plasma mass spectrometry （ICP-MS）, scanning electron microscopy （SEM）, X-ray fluorescence spectrometer （XRF） and X-ray diffraction （XRD） techniques. The results show that the concentrations of REEs range from 22.15μg/g to 278.45 μg/g, with an average of 90.7 μg/g; the REEs are mainly related to inorganic minerals, especially the clay mineral-kaolinite; the REE concentrations in different layers vary greatly. That is to say, both tectonic movement and coal deformation did not cause any change in the content or distribution of REEs in coal seams; the contents of REEs in some layers exceeded the cut-off grade for beneficial recovery, so the coal seams are the potential REE resources.