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.
|State||Published - Oct 1 2021|
Bibliographical noteFunding Information:
This study was completed as part of U.S. Department of Energy contract DE-FE0026952 and National Science Foundation grants CBET-1510965 and CBET-1510861 to Duke University and the University of Kentucky, respectively.
This study was completed as part of U.S. Department of Energy contract DE-FE0026952 and National Science Foundation grants CBET-1510965 and CBET-1510861 to Duke University and the University of Kentucky, respectively. Responsibilities: All authors were responsible for the writing and editing of the manuscript. Hower and Groppo, among others at the CAER, collected the samples; Hower managed the CAER-based portion of the project; Hsu-Kim managed the Duke University portion of the project; and Taggart was responsible for the ICP-MS analyses.
© 2021 Elsevier Ltd
- Fly ash beneficiation
- Heavy rare earth elements
- Rare earth processing
ASJC Scopus subject areas
- Chemical Engineering (all)
- Fuel Technology
- Energy Engineering and Power Technology
- Organic Chemistry