宁武煤田2号煤中镓的富集与赋存特征  

Enrichment and Occurrence of Ga in No.2 Coal Seam of Ningwu Coalfield

作　　者：马娟娟 张帆[1] 李舒研 李敬智 王金喜[1] MA Juanjuan;ZHANG Fan;LI Shuyan;LI Jingzhi;WANG Jinxi(Key Laboratory of Resource Exploration Research of Hebei Province,Hebei University of Engineering,Handan,Hebei 056038)

机构地区：[1]河北工程大学河北省资源勘测研究重点实验室,河北邯郸056038

出　　处：《中国煤炭地质》2023年第1期7-12,共6页Coal Geology of China

基　　金：国家自然科学基金项目“华北盆地石炭二叠纪森林沼泽野火的证据及其古气候效应”(41807305);河北省自然科学基金项目“深部低透气性煤层瓦斯赋存规律及解吸特征研究”(E2020209074)。

摘　　要：宁武煤田是我国典型的煤伴生资源丰富的煤炭基地。为研究煤中Ga的成矿规律,从宁武煤田2号煤中采集了117个煤样,通过工业分析、X射线衍射、扫描电子显微镜、X射线荧光光谱、电感耦合等离子体质谱和逐级化学提取实验对样品进行测试分析。结果表明宁武煤田2号煤中Ga的平均含量为30.93μg/g,整体上属于轻度富集—富集。逐级化学提取的结果显示煤中Ga的赋存以残渣态为主,占比87~92%,其次为有机态,占比6%~10%。由煤中Ga与煤质和常量元素的相关性分析认为,高岭石、勃姆石等黏土矿物是煤中Ga的主要矿物载体,黏土矿物对Ga的吸附是2号煤中Ga富集的主要原因。Ningwu coalfield is a typical coal base with abundant coal associated resources.In order to study the metallogenic regularity of Ga in coal,117 coal samples were collected from No.2 coal seam in Ningwu coalfield.The samples were tested and analyzed by industrial analysis,X-ray diffraction,scanning electron microscopy,X-ray fluorescence spectroscopy,inductively coupled plasma mass spectrometry and sequential chemical extraction experimental.The results show that the average content of Ga in No.2 coal seam of Ningwu coalfield is 30.93μg/g and slightly enriched.The results of sequential chemical extraction experimental shows that the main occurrence of Ga in coal is residue,accounting for 87%~92%,followed by organic state,accounting for 6%~10%.Based on the correlation analysis of Ga in coal with coal quality and major elements,it is concluded that clay minerals such as kaolinite and boehmite are the main mineral carriers of Ga in coal.The adsorption of clay minerals to Ga is the main reason for Ga enrichment in No.2 coal seam.

关 键 词：煤中镓 富集规律 赋存状态 宁武煤田 

分 类 号：TQ533.1[化学工程—煤化学工程]