Signatures of rare earth element distributions in fly ash derived from the combustion of Central Appalachian, Illinois, and Powder River basin coals

FUEL

卷:301

Article

Hower, James C.^1,2  Groppo, John G.^1,3  Hsu-Kim, Heileen⁴  Taggart, Ross K.⁴ 

[1] Univ Kentucky, Ctr Appl Energy Res, 2540 Res Pk Dr, Lexington, KY 40511 USA

[2] Univ Kentucky, Dept Earth & Environm Sci, Lexington, KY 40506 USA

[3] Univ Kentucky, Dept Min Engn, Lexington, KY 40506 USA

[4] Duke Univ, Dept Civil & Environm Engn, Durham, NC 27708 USA

关键词: Lanthanides;    Heavy rare earth elements;    Fly ash beneficiation;    Rare earth processing;   

DOI  :  10.1016/j.fuel.2021.121048

来源: Elsevier

【 摘 要 】

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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