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Title: Process development for the recovery of rare earth elements and critical metals from an acid mine leachate

Abstract

Acid mine leachate (AML) may be a significant source of rare earth and other critical elements needed for the manufacturing of advanced electronics and renewable energy technologies. Here, a systematic study was performed on a natural leachate collected from a coal preparation plant that treated bituminous coal containing elevated amounts of pyrite. The leachate contained 1.96 ppm total REEs, 2.52 ppm Zn, 2.15 ppm Ni, 1.22 ppm Cu, 0.77 ppm Co, and 25 ppm Mn. Sequential precipitation using simple pH control generated a pre-concentrate containing 0.82% total REEs, 1.08% Zn, 0.91% Ni, 0.50% Cu, 0.34% Co, 7.1% Mn. The pre-concentrate was further treated by re-dissolution using a 10 M HNO3 solution, which resulted in a solution pH of 1.5. The addition of oxalic acid to selectively precipitate the REEs followed by roasting of the precipitate generated a product containing>98% rare earth oxides. More than 95% of the Cu and Zn were recovered from the residual liquid using Na2S at pH 2 and 3, respectively. The CuS and ZnS contents in the corresponding concentrates were 60% and 58%, respectively. The majority of the Co and Ni remained in the residual liquid. Based on these findings, a process flowsheet was developed tomore » recover the REEs and critical metals from AML.« less

Authors:
 [1]; ORCiD logo [2]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  2. Univ. of Kentucky, Lexington, KY (United States)
Publication Date:
Research Org.:
Univ. of Kentucky, Lexington, KY (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1808739
Alternate Identifier(s):
OSTI ID: 1615689
Grant/Contract Number:  
FE0027035
Resource Type:
Accepted Manuscript
Journal Name:
Minerals Engineering
Additional Journal Information:
Journal Volume: 153; Journal ID: ISSN 0892-6875
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; Coal; Acid mine leachate; Selective precipitation; Dissolution; Rare earth elements; Critical metals

Citation Formats

Zhang, Wencai, and Honaker, Rick. Process development for the recovery of rare earth elements and critical metals from an acid mine leachate. United States: N. p., 2020. Web. https://doi.org/10.1016/j.mineng.2020.106382.
Zhang, Wencai, & Honaker, Rick. Process development for the recovery of rare earth elements and critical metals from an acid mine leachate. United States. https://doi.org/10.1016/j.mineng.2020.106382
Zhang, Wencai, and Honaker, Rick. Wed . "Process development for the recovery of rare earth elements and critical metals from an acid mine leachate". United States. https://doi.org/10.1016/j.mineng.2020.106382. https://www.osti.gov/servlets/purl/1808739.
@article{osti_1808739,
title = {Process development for the recovery of rare earth elements and critical metals from an acid mine leachate},
author = {Zhang, Wencai and Honaker, Rick},
abstractNote = {Acid mine leachate (AML) may be a significant source of rare earth and other critical elements needed for the manufacturing of advanced electronics and renewable energy technologies. Here, a systematic study was performed on a natural leachate collected from a coal preparation plant that treated bituminous coal containing elevated amounts of pyrite. The leachate contained 1.96 ppm total REEs, 2.52 ppm Zn, 2.15 ppm Ni, 1.22 ppm Cu, 0.77 ppm Co, and 25 ppm Mn. Sequential precipitation using simple pH control generated a pre-concentrate containing 0.82% total REEs, 1.08% Zn, 0.91% Ni, 0.50% Cu, 0.34% Co, 7.1% Mn. The pre-concentrate was further treated by re-dissolution using a 10 M HNO3 solution, which resulted in a solution pH of 1.5. The addition of oxalic acid to selectively precipitate the REEs followed by roasting of the precipitate generated a product containing>98% rare earth oxides. More than 95% of the Cu and Zn were recovered from the residual liquid using Na2S at pH 2 and 3, respectively. The CuS and ZnS contents in the corresponding concentrates were 60% and 58%, respectively. The majority of the Co and Ni remained in the residual liquid. Based on these findings, a process flowsheet was developed to recover the REEs and critical metals from AML.},
doi = {10.1016/j.mineng.2020.106382},
journal = {Minerals Engineering},
number = ,
volume = 153,
place = {United States},
year = {2020},
month = {4}
}

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Cited by: 1 work
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