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

Abstract

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.

Authors:
 [1];  [2];  [1];  [2];  [2];  [2];  [1];  [1];  [1]
+ Show Author Affiliations
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); AECOM, Pittsburgh, PA (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Sponsoring Org.:
FE; USDOE
OSTI Identifier:
1509717
Alternate Identifier(s):
OSTI ID: 1495262
Report Number(s):
NETL-PUB-21586
Journal ID: ISSN 0016-2361
Grant/Contract Number:  
FE0004000
Resource Type:
Accepted Manuscript
Journal Name:
Fuel
Additional Journal Information:
Journal Volume: 232; Journal Issue: C; Journal ID: ISSN 0016-2361
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; coal fly ash; hydrothermal treatment; magnetic separation; rare earth elements (REE); sequential extraction

Citation Formats

Lin, Ronghong, Stuckman, Mengling, Howard, Bret H., Bank, Tracy L., Roth, Elliot A., Macala, Megan K., Lopano, Christina, Soong, Yee, and Granite, Evan J. Application of sequential extraction and hydrothermal treatment for characterization and enrichment of rare earth elements from coal fly ash. United States: N. p., 2018. Web. doi:10.1016/j.fuel.2018.05.141.
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Lin, Ronghong, Stuckman, Mengling, Howard, Bret H., Bank, Tracy L., Roth, Elliot A., Macala, Megan K., Lopano, Christina, Soong, Yee, & Granite, Evan J. Application of sequential extraction and hydrothermal treatment for characterization and enrichment of rare earth elements from coal fly ash. United States. https://doi.org/10.1016/j.fuel.2018.05.141
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Lin, Ronghong, Stuckman, Mengling, Howard, Bret H., Bank, Tracy L., Roth, Elliot A., Macala, Megan K., Lopano, Christina, Soong, Yee, and Granite, Evan J. Fri . "Application of sequential extraction and hydrothermal treatment for characterization and enrichment of rare earth elements from coal fly ash". United States. https://doi.org/10.1016/j.fuel.2018.05.141. https://www.osti.gov/servlets/purl/1509717.
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@article{osti_1509717,
title = {Application of sequential extraction and hydrothermal treatment for characterization and enrichment of rare earth elements from coal fly ash},
author = {Lin, Ronghong and Stuckman, Mengling and Howard, Bret H. and Bank, Tracy L. and Roth, Elliot A. and Macala, Megan K. and Lopano, Christina and Soong, Yee and Granite, Evan J.},
abstractNote = {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.},
doi = {10.1016/j.fuel.2018.05.141},
journal = {Fuel},
number = C,
volume = 232,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2018},
month = {Fri Jun 01 00:00:00 EDT 2018}
}
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Publisher's Version of Record
https://doi.org/10.1016/j.fuel.2018.05.141
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Works referenced in this record:

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Organic and inorganic associations of rare earth elements in central Appalachian coal
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Synthesis of zeolites from coal fly ash: an overview
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Arsenic adsorption by soils and iron-oxide-coated sand: kinetics and reversibility
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Improvement of the BCR three step sequential extraction procedure prior to the certification of new sediment and soil reference materials
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Distribution of rare earth elements in coal combustion fly ash, determined by SHRIMP-RG ion microprobe
journal, November 2017

A critical review on solvent extraction of rare earths from aqueous solutions
journal, February 2014

Mechanism of zeolite synthesis from coal fly ash by alkali hydrothermal reaction
journal, February 2002

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Leaching behaviour of elements from coal combustion fly ash: An overview
journal, May 2012

New perspectives for coal ash utilization: synthesis of zeolitic materials
journal, February 1990

Fly ash characterization by SEM–EDS
journal, December 2006

Coal fly ash as a resource for rare earth elements
journal, January 2015

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  • Environmental Science and Pollution Research, Vol. 22, Issue 12
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Mobility of trace elements from coal and combustion wastes
journal, May 1996

Influence of trace metal distribution on its leachability from coal fly ash
journal, August 2008

Speciation, Characterization, and Mobility of As, Se, and Hg in Flue Gas Desulphurization Residues
journal, March 2008

  • Al-Abed, Souhail R.; Jegadeesan, Gautham; Scheckel, Kirk G.
  • Environmental Science & Technology, Vol. 42, Issue 5
  • DOI: 10.1021/es702479n
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    Works referencing / citing this record:

    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
    journal, October 2019

    • Vass, Christopher R.; Noble, Aaron; Ziemkiewicz, Paul F.
    • Mining, Metallurgy & Exploration, Vol. 36, Issue 5
    • DOI: 10.1007/s42461-019-00112-9
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