Distribution of rare earth elements in fly ash derived from the combustion of Illinois Basin coals. (1st April 2021)

• Record Type: Journal Article
• Authors: Hower, James C.; Groppo, John G.; Hsu-Kim, Heileen; Taggart, Ross K.
• Is Part Of: Fuel. Volume 289(2021)
• Publication Date: 2021-04-01
• Subjects: Lanthanides -- Critical materials -- Energy resources -- Coal -- Fly ash; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.119990
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: Rank of the feed coals ranges from high volatile C to high volatile A bituminous. Feed coals generally have S contents averaging about 3%. REE in Illinois Basin fly ashes are 1/3 rd less than for Central Appalachian ashes. Illinois Basin fly ashes have an H-type enrichment, with varying Gd peaks. Illinois Basin fly ashes resemble mixed-source Central Appalachian ashes. Abstract: 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 Fe2 O3 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. 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.