Aqueous acid and alkaline extraction of rare earth elements from coal combustion ash

By J. King, Ross K. Taggart, Ryan C Smith, J. Hower, Heileen Hsu-Kim. International Journal of Coal Geology, 2018

141 citations recorded by the source corpus.

Abstract The recovery of rare earth elements (REEs) from coal combustion fly ash has recently gained attention as a possible beneficial reuse application that could provide an alternative, low-grade source of REEs in an unstable global supply market. To economically recover REEs, an efficient process needs to be developed to remove them from the ash. This study investigated different methods of leaching REEs from fly ash and other coal combustion ashes. Aqueous acid and alkaline leaching were employed on multiple types of coal fly ash samples (representing coals from three major U.S. coal basin sources) with variable leaching parameters that include extractant type (HCl, NaOH), extractant concentration, leachate-to-ash ratio, and addition of CaO during the leaching process. Acid leaching of high calcium-containing fly ashes such as samples derived from Powder River Basin coals had the highest recoveries of REEs (near 100% of total REE contents), while leaching efficiencies were much lower (

Subfields: Building and Construction, Geochemistry and Petrology

View Paper: https://www.semanticscholar.org/paper/6be86099bb148f28f9eebb784446d0799bb1c1e1

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In Building and Construction

  1. R. Honaker
  2. Xinbo Yang
  3. A. Noble
  4. Wencai Zhang

In Geochemistry and Petrology

  1. R. Honaker
  2. Xinbo Yang
  3. A. Noble
  4. Wencai Zhang

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