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Green Approach for Rare Earth Element (REE) Recovery from Coal Fly Ash

[Image: see text] Due to the growing demands of rare earth elements (REEs) and the vulnerability of REEs to potential supply disruption, there have been increasing interests in recovering REEs from waste streams such as coal fly ash (CFA). Meanwhile, CFA as a large industrial waste stream in the Uni...

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Autores principales: Liu, Pan, Zhao, Simin, Xie, Nan, Yang, Lufeng, Wang, Qian, Wen, Yinghao, Chen, Hailong, Tang, Yuanzhi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10077585/
https://www.ncbi.nlm.nih.gov/pubmed/36942728
http://dx.doi.org/10.1021/acs.est.2c09273
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author Liu, Pan
Zhao, Simin
Xie, Nan
Yang, Lufeng
Wang, Qian
Wen, Yinghao
Chen, Hailong
Tang, Yuanzhi
author_facet Liu, Pan
Zhao, Simin
Xie, Nan
Yang, Lufeng
Wang, Qian
Wen, Yinghao
Chen, Hailong
Tang, Yuanzhi
author_sort Liu, Pan
collection PubMed
description [Image: see text] Due to the growing demands of rare earth elements (REEs) and the vulnerability of REEs to potential supply disruption, there have been increasing interests in recovering REEs from waste streams such as coal fly ash (CFA). Meanwhile, CFA as a large industrial waste stream in the United States (U.S.) poses significant environmental and economic burdens. Recovery of REEs from CFA is a promising solution to the REE scarcity issue and also brings opportunities for CFA management. This study demonstrates a green system for REE recovery from Class F and C CFA that consists of three modules: REE leaching using citrate, REE separation and concentration using oxalate, and zeolite synthesis using secondary wastes from Modules I and II. In Module I, ∼10 and 60% REEs were leached from the Class F and C CFA samples, respectively, using citrate at pH 4. In Module II, the addition of oxalate selectively precipitated and concentrated REEs from the leachate via the formation of weddellite (CaC(2)O(4)·2H(2)O), while other trace metals remained in solution. In Module III, zeolite was synthesized using wastes from Modules I and II. This study is characterized by the successful recovery of REEs and upcycling of secondary wastes, which addresses both REE recovery and CFA management challenges.
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spelling pubmed-100775852023-04-07 Green Approach for Rare Earth Element (REE) Recovery from Coal Fly Ash Liu, Pan Zhao, Simin Xie, Nan Yang, Lufeng Wang, Qian Wen, Yinghao Chen, Hailong Tang, Yuanzhi Environ Sci Technol [Image: see text] Due to the growing demands of rare earth elements (REEs) and the vulnerability of REEs to potential supply disruption, there have been increasing interests in recovering REEs from waste streams such as coal fly ash (CFA). Meanwhile, CFA as a large industrial waste stream in the United States (U.S.) poses significant environmental and economic burdens. Recovery of REEs from CFA is a promising solution to the REE scarcity issue and also brings opportunities for CFA management. This study demonstrates a green system for REE recovery from Class F and C CFA that consists of three modules: REE leaching using citrate, REE separation and concentration using oxalate, and zeolite synthesis using secondary wastes from Modules I and II. In Module I, ∼10 and 60% REEs were leached from the Class F and C CFA samples, respectively, using citrate at pH 4. In Module II, the addition of oxalate selectively precipitated and concentrated REEs from the leachate via the formation of weddellite (CaC(2)O(4)·2H(2)O), while other trace metals remained in solution. In Module III, zeolite was synthesized using wastes from Modules I and II. This study is characterized by the successful recovery of REEs and upcycling of secondary wastes, which addresses both REE recovery and CFA management challenges. American Chemical Society 2023-03-21 /pmc/articles/PMC10077585/ /pubmed/36942728 http://dx.doi.org/10.1021/acs.est.2c09273 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Liu, Pan
Zhao, Simin
Xie, Nan
Yang, Lufeng
Wang, Qian
Wen, Yinghao
Chen, Hailong
Tang, Yuanzhi
Green Approach for Rare Earth Element (REE) Recovery from Coal Fly Ash
title Green Approach for Rare Earth Element (REE) Recovery from Coal Fly Ash
title_full Green Approach for Rare Earth Element (REE) Recovery from Coal Fly Ash
title_fullStr Green Approach for Rare Earth Element (REE) Recovery from Coal Fly Ash
title_full_unstemmed Green Approach for Rare Earth Element (REE) Recovery from Coal Fly Ash
title_short Green Approach for Rare Earth Element (REE) Recovery from Coal Fly Ash
title_sort green approach for rare earth element (ree) recovery from coal fly ash
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10077585/
https://www.ncbi.nlm.nih.gov/pubmed/36942728
http://dx.doi.org/10.1021/acs.est.2c09273
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