陕北横山矿区延安组3^(-1)煤层Sr和Ba的分布及赋存模式

Distribution and mode of occurrence of Jurassic 3^(-1) coal from Hengshan

煤中微量元素Sr和Ba的分布和赋存模式对研究煤层成煤古环境和煤炭的洁净利用有重要的意义。通过对横山5个矿区24个主采煤层煤样的工业分析、元素分析、矿物组成分析,采用相关性分析和逐级化学提取实验,研究该主采煤层中Sr和Ba的分布和赋存模式。研究发现,区内超过75%煤样属于特低灰煤;约96%的煤样全硫质量分数超过1%;主要的矿物成分为高岭石、黄铁矿和方解石。超过总分析煤样75%的样品中Sr和Ba富集,且在水平方向上Sr和Ba含量北部较南部更高。煤中Sr和Ba主要负载在天青石、重晶石、菱锶矿、碳酸钡矿、方解石和文石等矿物中。煤中Sr和Ba富集的主要原因是煤层中含有负载这两种元素的矿物。

The distribution and mode of occurrence of Sr and Ba are important to study the coal seam coal-forming palaeosedimentary environment and coal clean utilization.The distribution and mode of occurrence of Sr and Ba in the24main mined seams from5coal mines in Hengshan were studied using proximate analysis,ultimate analysis,mineral constituent analysis,correlation analysis,and sequential extraction experiment.75%coal sample were ultra-low ash coal.The total sulfur content of about96%coals was more than1%.Kaolinite,pyrite and calcite were main mineral composition in the studied coals.Sr and Ba were enriched in more than75%coals,and the content of Sr and Ba was higher in the north than in the south of the study area.All results showed that Sr and Ba were mainly carried by celestite,barite,strontium,witherite,calcite and aragonite in the studied coals.The occurrence of mineral containing Sr and Ba in the coal seam causes the enrichment of Sr and Ba.