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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]
  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:
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.
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. doi:10.1016/j.fuel.2018.05.141.
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. doi:10.1016/j.fuel.2018.05.141. https://www.osti.gov/servlets/purl/1509717.
@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 = {2018},
month = {6}
}

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