期刊
FUEL
卷 301, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.121048
关键词
Lanthanides; Heavy rare earth elements; Fly ash beneficiation; Rare earth processing
资金
- U.S. Department of Energy [DE-FE0026952]
- National Science Foundation [CBET-1510965, CBET-1510861]
- University of Kentucky
The distribution of Rare Earth elements (REE) in coal-derived fly ashes varies depending on the coal source and basins. Different coal types exhibit variations in REE concentration and distribution in fly ashes. The signature of REE in fly ashes can be indicative of their behavior in extraction processes, but the actual distribution may differ between fly ashes from different basins.
The distribution of Rare Earth elements (REE) in coal-derived fly ashes can have distinctive patterns when fly ashes are produced from different coals within or between basins, such as the Pennsylvanian Class F fly ashes from the Illinois and Central Appalachian basins. Both the Fire Clay coal and a blend of a number of eastern Kentucky coals show strong Gd peaks and an H-type distribution in the Upper Continental Crust-corrected plots. The Fire Clay coal-derived ash has a higher heavy REE concentration than the blended coal-derived ash. The Illinois Basin-derived fly as has an overall lower REE concentration than the latter ashes. Class C fly ash derived from Powder River Basin coals has, with the exception of an Eu peak, a flatter distribution of REE and an overall L-type or indistinct H- versus L-type distribution. The signatures of the REE in fly ashes may be useful in predicting their behavior in the extraction of the REE; simple extrapolations from the basic concentrations and the predicted extraction percentages for ashes from different basins are not necessarily indicative of the actual distribution of the extracted REE.
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