黔西南煤层主要伴生矿物中汞的分布特征  

The Distribution of Mercury in Major Associated Minerals from Coal Beds in Southwestern Guizhou

作　　者：张军营[1] 任德贻[1] 许德伟[1] 刘建荣[2] 董兵[2] 张春燕 

机构地区：[1]中国矿业大学,北京100083 [2]中国预防医学科学院环境卫生检测所,北京100021 [3]山西煤炭地质公司,太原030045

出　　处：《地质论评》1999年第5期539-542,共4页Geological Review

基　　金：国家自然科学基金(编号49632090)

摘　　要：将黔西南煤层中不同成因的7种主要矿物分离,对其进行光学显微镜、扫描电镜及能谱分析;利用冷原子吸收光谱测定煤及矿物中汞的含量;并结合矿物包裹体测温和硫同位素分析,研究结果表明,黔西南煤层中汞主要分布于矿物中。不同成因黄铁矿中汞含量明显不同,后期低温热液成因的黄铁矿中汞含量(22.5×10^(-6))>>结核状黄铁矿中的(3.51×10^(-6))>块状黄铁矿中的(2.97×10^(-6))>后期淋滤成因黄铁矿中的(1.80×10^(-6))。煤中后期低温热液成因的黄铁矿脉中汞(22.5×10^(-6))和方解石脉中汞(11.9×10^(-6))含量高,煤层所含方解石中含汞量较高以前未见报道。黔西南煤层中,原生成因的汞含量很低,后期淋滤成因的汞含量占较大比例,特别是后期低温热液成因的汞是部分煤中汞最主要来源,通过洗选可大大降低煤燃烧过程中汞的排放量。Seven major minerals of different geneses in coals from southwestern Guizhou have been i-dentified using microscopy, combined scanning electron microscopy-energy spectrum analysis inclusion analysis and sulfur isotope analysis. Hg in coals and minerals were determined by cool-vapor atomic absorption spectrometry. The results show that Hg in coals of southwestern Guizhou is dominantly associated with minerals. The contents of Hg are obviously different in pyrite of different origins, epithermal pyrite vein (22. 5 ×10~6) S>nodular pyrite (3. 51 × 10~6) >mas-sive pyrite (2. 97 ×1(T6) >pyrite in leaching vein (1. 80×1(T6). Additionally, the Hg content in epithermal calcite veins is also high (11.9 × 10~6). Hg in coals from southwestern Guizhou is dominantly of epithermal origin. Coal cleaning technique may remove most Hg from coals.

关 键 词：煤层 晚二叠世 赋存状态 煤矿床 伴生矿物 

分 类 号：P618.110.4[天文地球—矿床学] P618.68[天文地球—地质学]