煤中微量元素赋存状态和富集机理——以新疆淖毛湖煤田兴盛露天矿下侏罗统八道湾组为例  

The Mode of Occurrence and Enrichment Mechanism of Trace Elements in Coal-A Case Study of Badaowan Formation of Xingsheng Outcrop Mine

作　　者：郑德超 马聪 柳昆鹏 梁明智 袁慧敏 孟珊珊 Zheng Dechao;Ma Cong;Liu Kunpeng;Liang Mingzhi;Yuan Huimin;Meng Shanshan(School of Marine Earth Sciences,Ocean University of China,Qingdao,Shandong,266071,China;First Geological and Mineral Exploration Institute of Shandong,Jinan,Shandong,250014,China;Xinjiang Jiangna Mining Co.,Ltd,Hami,Xinjiang,839000,China)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266071 [2]山东省第一地质矿产勘查院,山东济南250014 [3]新疆疆纳矿业有限公司,新疆哈密839000

出　　处：《新疆地质》2025年第1期115-123,共9页Xinjiang Geology

摘　　要：对新疆淖毛湖煤田兴盛露天矿下侏罗统八道湾组煤进行系统的物质组成测试和分析,以查明煤质特征和关键金属含量,评价其综合利用潜力。研究煤以中等-中高水分含量、特低-低灰分产率、高-特高挥发分产率和特低硫含量为特征,与优质液化煤煤质特征相似。煤中常量元素主要由SiO_(2)、Al_(2)O_(3)和CaO组成,次为Fe_(2)O_(3),含少量Na_(2)O、MgO和TiO_(2)及微量K_(2)O。与世界煤相比,煤中微量元素与世界煤相似或亏损;与世界煤灰相比,煤灰中锂和锶达轻度富集。煤中碎屑物质主要以基性-中性组分为主,主要来自于上石炭统巴塔玛依内山组的安山质凝灰岩。相关分析和逐级化学提取结果表明,锂主要赋存于黏土矿物中,锶与有机质紧密结合。锂的富集主要受控于中性碎屑物质组分的供给程度。锶的分布和富集主要受控于水岩作用程度,强烈的水岩作用导致碎屑物质中锶的释放,进而向邻近层迁移和沉淀;在迁移过程中,锶被有机质吸附表现出有机亲和性。研究区煤可成为优质液化煤和关键金属锂和锶的潜在来源,可考虑综合勘探和利用。The inorganic components of Lower Jurassic Badaowan Formation coal from Xingsheng outcrop mine in Naomaohu Coalfield,Xinjiang Province were systematically tested and analyzed to identify the characteristics of coal quality and critical elements content and evaluate comprehensive utilization potential of the studied coals.The coal studied is characterized by medium to medium-high moisture content,ultra-low to low ash yield,high to ultra-high volatile yield and ultra-low sulfur content,which are similar to the characteristics of high-quality liquefied coal.The major elements in coal are mainly composed of SiO_(2),Al_(2)O_(3) and CaO,followed by Fe_(2)O_(3),with minor amount of Na_(2)O,MgO and TiO_(2) and trace amount of K_(2)O.Compared with the world coal,the trace elements in coal are similar to or less than that of the world coal;Compared to world coal ash,lithium and strontium are slightly enriched.The detrital material in the coal is mainly composed of basic-intermediate components,which are mainly derived from the andesitic tuff of the Batemayineishan Formation of the Upper Carboniferous.The correlation analysis and sequential leaching showed that lithium mainly existed in clay minerals,and strontium is associated with organic matter.The enrichment of lithium is mainly controlled by the input of intermediate detrital material.The distribution and enrichment of strontium are mainly controlled by the degree of water/rock interaction.Strong water/rock interaction leads to the release of strontium in the detrital material,and then migrates and precipitates to the adjacent layer.During the migration process,strontium may be adsorbed by organic matter,thus showing organic affinity.The studied coals may be considered as a potential source of high-quality liquefied coal and critical metals(e.g.,Li and Sr)which are explored and utilized comprehensively.

关 键 词：淖毛湖煤田 赋存状态 八道湾组 煤 锶 

分 类 号：P618.11[天文地球—矿床学] P641.461[天文地球—地质学]