Application of sequential extraction and hydrothermal treatment for characterization and enrichment of rare earth elements from coal fly ash

Lin, Ronghong; Stuckman, Mengling; Howard, Bret H.; Bank, Tracy L.; Roth, Elliot A.; Macala, Megan K.; Lopano, Christina; Soong, Yee; Granite, Evan J.

doi:10.1016/j.fuel.2018.05.141

Title: Application of sequential extraction and hydrothermal treatment for characterization and enrichment of rare earth elements from coal fly ash

Journal Article · Fri Jun 01 00:00:00 EDT 2018 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2018.05.141· OSTI ID:1509717

Lin, Ronghong ^[1]; Stuckman, Mengling ^[2]; Howard, Bret H. ^[1]; Bank, Tracy L. ^[2]; Roth, Elliot A. ^[2]; Macala, Megan K. ^[2]; Lopano, Christina ^[1]; Soong, Yee ^[1]; Granite, Evan J. ^[1]

National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); AECOM, Pittsburgh, PA (United States)

Rare earth elements (REE) play a critical role in the global economy. The concern about the REE supply challenge has stimulated global interest in recovering REE from alternative non-conventional REE sources such as coal fly ash. In this paper, sequential extraction, physical separations and hydrothermal alkaline treatment were explored for characterization and enrichment of REE from coal fly ash. Seven-step sequential extraction of coal fly ash has demonstrated that 86.1% of total REE were associated with the glassy phase of the fly ash, with the remaining REE mainly distributed in the organic and sulfides phase (8.3%), the exchangeable phase (3.7%), and the carbonates phase (1.5%). A process combining physical separations, namely, particle size separation and magnetic separation, and hydrothermal alkaline treatment was proposed for enrichment of REE from coal fly ash. The optimal hydrothermal alkaline treatment condition was determined. It was demonstrated that NaOH concentration, solid-to-liquid ratio, temperature, and reaction duration had significant influence on ash dissolution in NaOH solution. Grinding could also enhance ash dissolution during subsequent hydrothermal alkaline treatment. Furthermore REE were enriched from coal fly ash from 325 mg/kg to 877 mg/kg via the proposed process under optimal hydrothermal alkaline treatment conditions.

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Research Organization:: National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)

Sponsoring Organization:: FE; USDOE

Grant/Contract Number:: FE0004000

OSTI ID:: 1509717

Alternate ID(s):: OSTI ID: 1495262

Report Number(s):: NETL-PUB-21586

Journal Information:: Fuel, Vol. 232, Issue C; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 76 works

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The Occurrence and Concentration of Rare Earth Elements in Acid Mine Drainage and Treatment Byproducts. Part 2: Regional Survey of Northern and Central Appalachian Coal Basins Vass, Christopher R.; Noble, Aaron; Ziemkiewicz, Paul F. Mining, Metallurgy & Exploration, Vol. 36, Issue 5 https://doi.org/10.1007/s42461-019-00112-9	journal	October 2019

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