In-situ analysis of the lithium occurrence in the No.11 coal from the Antaibao mining district, Ningwu Coalfield, northern China
In-situ analysis of the lithium occurrence in the No.11 coal from the Antaibao mining district, Ningwu Coalfield, northern China
复制标题
宁武煤田安太堡矿区11号煤锂赋存状态原位分析
DOI：
10.1016/j.oregeorev.2022.104825
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发表时间：
2022
影响因子：
3.3
通讯作者：
Jie Wu
中科院分区：
文献类型：
--
作者：
Beilei Sun;Yunxia Liu;Lucie Tajcmanova;Chao Liu;Jie Wu
煤中锂的赋存状态是研究煤中锂富集和燃烧迁移机理的基础。然而，由于其原子量低，锂不能使用传统的微束分析检测，严重限制了其使用。以安太堡11号高锂煤层为研究对象，确定了该煤层中锂的赋存状态和富集方式，其锂含量为99.1 μg/g。与中国煤相比，安太堡11号煤富含SiO2、Al 2 O3和TiO 2。用统计相关法初步确定了Li的载体。此外，两个高锂煤台阶进行原位分析，使用飞行时间二次离子质谱（TOF-SIMS）。第一个高锂煤样的TOF-SIMS数据显示了三种类型的锂赋存状态，其含量为179 μg/g。根据Li、Si、Al、Na、K、Ca、Mg和Fe的化学分布图，该样品中Li的主要载体为伊利石、蒙脱石、蒙脱石和电气石。该高锂样品是由两个受海水影响的煤层相互作用形成的。淡水和咸水沃茨的相互作用使Li的赋存状态更加多变。然而，在第二富Li煤样品中Li浓度为260 μg/g的情况下，Li仅与Si和Al匹配，表明Li主要存在于高岭石中。该样品形成于离层与海进最大的煤层之间。该样本中发现的勃姆石与含铝土矿的风化壳有关。在局部，勃姆石充当Li和其他碱金属和碱性元素的渗透和相互作用的屏障。因此，Li只与Si和Al共生，沉积在原始泥炭中的陆源物质是该样品中Li富集的原因。
The occurrence of lithium (Li) in coal serves as the foundation for understanding the mechanism of its enrichment in coal and migration during combustion. However, owing to its low atomic weight, Li cannot be detected using conventional microbeam analyses, severely limiting its use. The high-Li Antaibao No.11 coal seam with a concentration of 99.1 μg/g Li was studied to determine the mode of occurrence and enrichment of Li. When compared to Chinese coal, the Antaibao No.11 coal is richer in SiO2, Al2O3, and TiO2. The carrier of Li was preliminarily determined using statistical correlation. In addition, two high-Li coal benches were subjected toin-situanalysis using time-of-flight secondary ion mass spectrometry (TOF-SIMS). The TOF-SIMS data show three types of Li occurrences in the first high-Li coal sample with a content of 179 μg/g. The main carriers of Li in this sample are illite, montmorillonite, chlorite, and tourmaline, according to the chemical maps for Li, Si, Al, Na, K, Ca, Mg, and Fe. This high-Li sample was formed by the interaction of two seawater-influenced coal seams. The interaction of fresh and saline waters makes the Li occurrence more variable. However, with a Li concentration of 260 μg/g in the second Li-enriched coal sample, Li only matches with Si and Al, indicating that Li is primarily found in kaolinite. This sample is formed between the parting and the seam with the greatest transgression. Boehmite is found in this sample in relation to the bauxite-bearing weathering crust. Locally, boehmite acts as a barrier to the infiltration and interaction of Li and other alkali and alkaline elements. As a result, Li is only associated with Si and Al. The terrigenous materials deposited within the original peat are responsible for the enrichment of Li in this sample.