Distribution of rare earth elements in fly ash derived from the combustion of Illinois Basin coals

Hower, James C.; Groppo, John G.; Hsu-Kim, Heileen; Taggart, Ross K.

doi:10.1016/j.fuel.2020.119990

Distribution of rare earth elements in fly ash derived from the combustion of Illinois Basin coals

Journal Article · Thu Dec 31 00:00:00 EST 2020 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2020.119990· OSTI ID:1849205

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Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research; Univ. of Kentucky, Lexington, KY (United States). Dept. of Earth and Environmental Sciences; Univ. of Kentucky, Lexington, KY (United States)
Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research; Univ. of Kentucky, Lexington, KY (United States). Dept. of Mining Engineering
Duke Univ., Durham, NC (United States). Dept. of Civil and Environmental Engineering

This study examined rare earth element (REE) trends for Illinois Basin coal-sourced fly ashes, with the goal of understanding the elemental composition and resource potential for various fly ash fractions. Illinois Basin coals have a high volatile C through A bituminous rank with a moderate ash content (slightly>12% ash (dry basis)), about 3% sulfur, and, in general, lower concentrations of hazardous and other trace elements than many Central Appalachian coals. Fly ash from the combustion of Illinois Basin coals tends to have a high Fe₂O₃ content owing to the amount of pyrite in the feed coals. The rare earth element (REE) concentrations in Illinois Basin coal-sourced fly ashes are less than that for fly ashes from the combustion of Central Appalachian coals. The Upper continental crust-corrected fly ashes show an H-type enrichment, a positive Eu_N/Eu_N^*, and, in some cases, a sharp Gd peak. For comparison, a suite of fly ashes from the combustion of a blend of eastern Kentucky coals had an H-type enrichment, a positive Eu_N/Eu_N^*, but only a minimal Gd peak. In contrast, fly ash from the combustion of the Fire Clay coal, a REE-rich coal, had a negative Eu_N/Eu_N^* and a sharp Gd peak. Finally, these results highlight the importance of feed coal composition on trace element contents of respective combustion fly ash fractions and also the unique REE enrichment patterns of the Illinois Basin fly ashes relative to the better studied fly ashes of eastern Kentucky and Central Appalachia.

View Accepted Manuscript (DOE)

Research Organization:: Duke Univ., Durham, NC (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0026952

OSTI ID:: 1849205

Alternate ID(s):: OSTI ID: 1775786

Journal Information:: Fuel, Journal Name: Fuel Journal Issue: C Vol. 289; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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