Nano-scale rare earth distribution in fly ash derived from the combustion of the fire clay coal, kentucky


Journal Article

© 2019 by the authors. Licensee MDPI, Basel, Switzerland. Fly ash from the combustion of eastern Kentucky Fire Clay coal in a southeastern United States pulverized-coal power plant was studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). TEM combined with elemental analysis via energy dispersive X-ray spectroscopy (EDS) showed that rare earth elements (REE; specifically, La, Ce, Nd, Pr, and Sm) were distributed within glassy particles. In certain cases, the REE were accompanied by phosphorous, suggesting a monazite or similar mineral form. However, the electron diffraction patterns of apparent phosphate minerals were not definitive, and P-lean regions of the glass consisted of amorphous phases. Therefore, the distribution of the REE in the fly ash seemed to be in the form of TEM-visible nano-scale crystalline minerals, with additional distributions corresponding to overlapping ultra-fine minerals and even true atomic dispersion within the fly ash glass.

Full Text

Duke Authors

Cited Authors

  • Hower, JC; Qian, D; Briot, NJ; Santillan-Jimenez, E; Hood, MM; Taggart, RK; Hsu-Kim, H

Published Date

  • April 1, 2019

Published In

Volume / Issue

  • 9 / 4

Electronic International Standard Serial Number (EISSN)

  • 2075-163X

Digital Object Identifier (DOI)

  • 10.3390/min9040206

Citation Source

  • Scopus