摘要
以鄂尔多斯盆地西缘宁东地区晚古生代煤层为例,利用光学显微镜、电感耦合等离子质谱仪和带能谱的扫描电镜等仪器分析了煤中硫和有害元素的分布规律,探讨了煤中硫对有害元素富集的影响。结果表明:宁东地区煤层中硫的赋存形式以黄铁矿硫为主,平均占全硫质量分数的57.87%,6号和9号煤层以有机硫为主。其中,山西组煤层中黄铁矿硫占全硫质量分数的59.38%,太原组煤层中黄铁矿硫占全硫质量分数的54.86%。煤层中全硫与黄铁矿硫呈现较好的正相关关系。煤中硫化物以黄铁矿为主,局部可见板状白铁矿和团块状黄铜矿。煤中黄铁矿的微观赋存形态包括自形与半自形细粒状、条带状、不规则块状、充填胞腔状、浸染状和莓球状。煤层中F,Ge,As,U和V的富集系数小于2,Cl,Pb和Ga的富集系数小于5。黄铁矿硫与煤层中Pb,Cl,F,As具有正相关关系,与V呈现较好的"抛物线"关系。有机硫与煤层中Ga存在负相关关系,煤层中F与Cl呈现正相关关系。认为煤层中有害元素对煤炭开采和煤层气开发不会造成影响。黄铁矿是微量元素Cl,F,V,Pb和As的重要载体,而有机硫决定了煤层中Ga的富集。太原组煤中硫具有多源性,成煤过程中海水的影响是引起太原组煤中全硫和黄铁矿硫质量分数较高的主要原因。
The research on the sulfur and hazardous trace elements in coal is of great significance for coal mining and coalbed methane development.Taking the late Paleozoic coal seam in the Ningdong area on the western margin of the Ordos Basin as an example,the optical microscopy,inductively coupled plasma mass spectrometer,and scanning electron microscope with energy spectrum were used to analyze the distribution of sulfur and hazardous trace elements in coal.The influence of sulfur on the hazardous trace elements in coal was discussed.The results show that pyrite sulfur is the main form of sulfur occurrence in coal seams in Ningdong area,accounting for 57.87%of the total sulfur content on average,and organic sulfur is the main form in coal seams No.6 and No.9.The pyrite sulfur accounts for 59.38%of the total sulfur content in coal from Shanxi formation,and the pyrite sulfur accounts for 54.86%of the total sulfur content in coal of Taiyuan formation.There is a good positive correlation between total sulfur and pyrite sulfur in coal seams.Pyrite is the main sulfide in coal,and plate-shaped pyrite and agglomerated chalcopyrite are partially visible.The occurrence forms of pyrite in coal include self-shaped and semi-self-shaped fine-grained,band-shaped,irregular block-shaped,filled cell-shaped,soaked and framboidal pyrite.The enrichment coefficients of F,Ge,As,U and V are less than 2,and those of Cl,Pb and Ga are less than 5 in the coal seams.The pyrite sulfur has a positive correlation with Pb,Cl,F and As,and V shows a good"parabola"relationship in coal.There is a negative correlation between organic sulfur and Ga,and a positive correlation between F and Cl in coal.It is believed that the hazardous elements of coal will not affect coal mining and coal bed methane development.Pyrite is an important carrier of trace elements Cl,F,V,Pb and As,and the organic sulfur determines the enrichment of Ga in coal.The sources of sulfur in Taiyuan coal are diverse.The seawater effect is the main reason for the high content of total sulfur and pyrite sulfur in Taiyuan coal.
作者
吴蒙
秦云虎
王晓青
张娜
杨柳
熊科
朱超
何建国
WU Meng;QIN Yunhu;WANG Xiaoqing;ZHANG Na;YANG Liu;XIONG Ke;ZHU Chao;HE Jianguo(Jiangsu Mineral Resources and Geological Design and Research Institute,Xuzhou 221006,China;Key Laboratory of Coal Resources and Mineral Resources,China Coal Geology Bureau,Xuzhou 221006,China;Key Laboratory of Coaled Methane Resource and Reservoir Formation Process,China University of Mining&Technology,Ministry of Education,Xuzhou 221008,China;College of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China;China National Administration of Coal Geology 173 Exploration Team,Zhuozhou 072750,China;School of Civil Engineering,Wanjiang University of Technology,Ma’anshan 243031,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2020年第S02期932-942,共11页
Journal of China Coal Society
基金
国家科技重大专项资助项目(2016ZX050660104)
中国煤炭地质总局科技专项基金资助项目(ZMKJ-2019-J13)
