A more in depth snippet of the paper on coal for rare earth extractions dated 2016
A Study on Removal of Rare Earth Elements from U.S. Coal Byproducts by Ion Exchange PETER L. ROZELLE, ADITI B. KHADILKAR, NUERXIDA PULATI, NARI SOUNDARRAJAN, MARK S. KLIMA, MORGAN M. MOSSER, CHARLES E. MILLER, and SARMA V. PISUPATI Rare earth elements are known to occur in low concentrations in U.S. coals and coal byproducts. These low concentrations may make rare earth element recovery from these materials unattractive, using only physical separation techniques. However, given the significant production of rare earths through ion exchange extraction in China, two U.S. coal byproducts were examined for ion extraction, using ammonium sulfate, an ionic liquid, and a deep eutectic solvent as lixiviants. Extraction of rare earth elements in each case produced high recoveries of rare earth elements to the solution. This suggests that in at least the cases of the materials examined, U.S. coal byproducts may be technically suitable as REE ores. More work is required to establish economic suitability. DOI: 10.1007/s40553-015-0064-7 ASM International (ASM) and The Minerals, Metals & Materials Society (TMS) 2016
Tried to copy and paste but complete article pdf didn't complete so here's the link
COPY AND PASTE FULL LINK INTO SEARCH ENGINE
Hope this answers many questions
http://download.springer.com/static...2254885761bc7949841718af19b982d920b37f4d3e4ff
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