- Article
Notes on the Potential for the Concentration of Rare Earth Elements and Yttrium in Coal Combustion Fly Ash
- James C. Hower,
- John G. Groppo,
- Kevin R. Henke,
- Madison M. Hood,
- Cortland F. Eble,
- Rick Q. Honaker,
- Wencai Zhang and
- Dali Qian
Certain Central Appalachian coals, most notably the Fire Clay coal with a REY-enriched volcanic ash fall tonstein, are known to be enriched in rare earth elements. The Fire Clay tonstein has a greater contribution to the total coal + parting REY tha...

