Enrichment of lithium in the claystone coal gangue from the Malan mine,Xishan Coalfield,Shanxi Province,Northern China |
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| Institution: | 1. Laboratório de Estudos Tectônicos (LESTE), Universidade Federal dos Vales do Jequitinhonha e Mucuri, Campus JK, MGT 367, Km 583, n° 5000 Alto da Jacuba, Diamantina, MG 39100-000, Brazil;2. Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Bauxita, Ouro Preto, MG, 35.400-000. Brazil;1. Planetary Chemistry Laboratory, Dept. of Earth & Planetary Sciences and McDonnell Center for the Space Sciences, Washington University, St Louis, MO 63130, USA;2. Materials and Structures Division, NASA Glenn Research Center/HX5, 21000 Brookpark Road, Cleveland, OH 44135, USA;1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;3. Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;4. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China;5. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China;1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;2. Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal Zellerfeld 38678, Germany;3. State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology, Chengdu 610059, China;4. Department of Petroleum & Gas Engineering, University of Engineering & Technology, 54890 Lahore, Pakistan;5. Sichuan bureau of geology & mineral resources - 402 Team, Chengdu 611743, China;1. Department of Geology and Geography, University of North Carolina at Pembroke, 1317 Oxendine Science Building, 1 University Dr., Pembroke, NC 28372, USA;2. Department of Geosciences, Midlands State University, Private Bag, 9055, Gweru, Zimbabwe;1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China;3. MNR Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Changchun 130061, China;4. Shandong Gold Geological Survey Co. Ltd. (Inner Mongolia), Chifeng, China;5. Inner Mongolia Weilasituo Mining Co. Ltd., Chifeng, China |
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| Abstract: | In China, the lack of Li resources is in stark contrast to a large amount of coal gangue produced by coal mining. To determine the distribution patterns and existing status of lithium (Li) elements in the coal gangue, the mineralogical and geochemical analysis were formed on samples of the roof, floor, and parting of No. 02, 2, 8, and 9 coal seams, being mined in Malan mine, Xishan coalfield, Shanxi Province. The results show that the lithium content in this study area is relatively enriched, the highest content is 499 μg/g in sample 02-G, and the average content is 109.8 μg/g, which is two times that of the world average value of claystone (45 μg/g). XRD analysis shows that the mineral composition of parting samples is mainly clay mineral kaolinite, while the coal seam roof and floor samples also include quartz and some iron-bearing minerals, such as pyrite and siderite. Likewise, possible lithium-rich mineral phases and possible lithium-rich factors were investigated in this paper. A comprehensive clay separation experiment and correlation analysis between lithium and major elements indicate that lithium is likely to exist in the clay mineral kaolinite in the study area. It is also found that the content of Li adsorbed by cryptocrystalline kaolinite is generally higher than that of crystalline kaolinite. According to the mechanism of Li+ adsorption in clay minerals, the higher lithium content of cryptocrystalline kaolinite is due to its larger specific surface area, which can adsorb more lithium on the surface. |
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