School of Resources and Geosciences, China University of Mining & Technology, Xuzhou 221116, China; Key Laboratory for Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, China; Key Laboratory of Coalbed Methane Resources & Reservoir Formation Process, Ministry of Education, China University of Mining & Technology, Xuzhou 221008, China.
Key Laboratory for Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, China.
Sci Total Environ. 2023 Jan 15;856(Pt 1):159123. doi: 10.1016/j.scitotenv.2022.159123. Epub 2022 Sep 29.
The enrichment of rare, scattered, rare earth, and noble elements, such as Li, Ga, Ge, rare earth elements and yttrium (REY), platinum group elements (PGE), Au, and Ag, have been discovered in the Late Permian coals from southwestern China. With the gradual depletion of traditional ore deposits, the geochemistry and resource utilization of critical metals in coals have received considerable attention. The geochemistry of associated elements in the Late Permian coals from the No. 10 coal profile of the Yueliangtian (YLT) underground mine, Liupanshui coalfield in Guizhou, were investigated to reveal the sediment source of inorganic components, as well as utilization prospects and controlling factors of critical metals. Silver and Pb were slightly enriched in the Yueliangtian coals, while Be, Rb, Sr, Mo, Cs, Ba, Tl, Bi, and U were significantly lower than that of world hard coals. The concentrations of total REY and individual elements in the Yueliangtian coals were similar to those of world hard coals. The minerals kaolinite, pyrite, calcite, and quartz predominated in coals, with trace amounts of anatase, gypsum, and apatite. High anatase proportion was identified in the floor and roof rock samples. Based on the AlO/TiO and Zr/TiO versus Nb/Y ratios, elemental assemblages, REY distribution, and paleogeography, the sediment source of mineral matter in the Yueliangtian coals dominated by felsic-intermediate rocks that from a distal volcanic arc or orogens was inferred. The terrigenous debris in the roof and floor rocks primarily originated from the high-Ti basalt of the Emeishan Large Igneous Province (ELIP). The relatively low elemental concentrations in these coals were primarily determined by their sediment sources. Although most critical metals in this coal were not enriched, the concentration of REY in coal ash was high enough to be considered as a potential resource for REY recovery given the extremely low ash yields of this coal.
在中国西南部的晚二叠世煤中发现了锂、镓、锗、稀土元素和钇（REY）、铂族元素（PGE）、金和银等稀有、分散、稀土和贵金属元素的富集。随着传统矿床的逐渐枯竭，煤中关键金属的地球化学和资源利用受到了相当大的关注。本研究对贵州六盘水煤田月亮田（YLT）井下 10 号煤层晚二叠世煤中伴生元素的地球化学特征进行了研究，以揭示无机成分的物源，以及关键金属的利用前景和控制因素。银和铅在月亮田煤中略有富集，而铍、铷、锶、钼、铯、钡、铊、铋和铀明显低于世界硬煤。月亮田煤中总 REY 和各元素的浓度与世界硬煤相似。煤中主要矿物为高岭石、黄铁矿、方解石和石英，微量矿物有锐钛矿、石膏和磷灰石。底板和顶板岩样中鉴定出高锐钛矿比例。基于 AlO/TiO 和 Zr/TiO 与 Nb/Y 比值、元素组合、REY 分布和古地理，推断出以长英质-中性岩为主的物源，认为该矿物物质来源于远火山弧或造山带。顶板和底板岩石中的陆源碎屑主要来源于峨眉山大火成岩省（ELIP）的高钛玄武岩。这些煤中大多数关键金属元素没有富集，其元素浓度相对较低主要取决于它们的物源。尽管该煤中大多数关键金属元素没有富集，但煤灰中 REY 的浓度足够高，考虑到该煤的灰分产率极低，可作为回收 REY 的潜在资源。
