Journal
INTERNATIONAL JOURNAL OF COAL GEOLOGY
Volume 189, Issue -, Pages 75-82Publisher
ELSEVIER
DOI: 10.1016/j.coal.2018.02.022
Keywords
Lanthanides; Transmission electron microscopy; Nanominerals; Appalachian coal
Categories
Funding
- National Science Foundation [CBET-1510965, CBET-1510861]
- Directorate For Engineering [1510861] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [1510861] Funding Source: National Science Foundation
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The Kentucky State University heating plant stoker ash, with over 1000 mu g/g Rare earth elements + yttrium (REY), was previously shown to be more resistant to acid-extraction than pulverized-coal fly ashes of similar bulk composition. In this study, the petrology and mineralogy of this stoker ash was examined in greater detail as a means to better understand why the REY were relatively inert towards acid extraction. The results showed that this stoker ash is dominated by mullite and quartz/cristobalite with lesser amounts of hematite and magnetite compared to the glass-dominated assemblages of pulverized-coal-combustion fly ashes with similar chemical compositions. On the nanometer to micron scale, La-Ce-Nd-bearing monazite and Ce phosphates (monazite - CePO4 and CeP3O9) are seen to be part of the mineral assemblage. Overall, the results demonstrate that despite the presence of discrete REY-bearing minerals in the sample, their encapsulation within other phases may explain their low extractability.
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