Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders

Carbonation is an effective method to promote the quality of the steel slag binder. In this article, two carbonation approaches, namely hot-stage carbonation and accelerated carbonation, were employed to leach the metals, and the influence mechanism on the metal sequential leachability of the binder...

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Autores principales:	Yaojun Liu, Jingrui Fang, Songhui Liu, Xiaopeng An, Yanwen Kang, Lan Wang
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	accelerated carbonation curing CO2 storage sequential leachability steel slag hot-stage carbonation General Works A
Acceso en línea:	https://doaj.org/article/c03e173925ce4f74b08110f20e262ac6
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id	oai:doaj.org-article:c03e173925ce4f74b08110f20e262ac6
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spelling	oai:doaj.org-article:c03e173925ce4f74b08110f20e262ac62021-11-17T05:06:24ZEffect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders2296-598X10.3389/fenrg.2021.765519https://doaj.org/article/c03e173925ce4f74b08110f20e262ac62021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fenrg.2021.765519/fullhttps://doaj.org/toc/2296-598XCarbonation is an effective method to promote the quality of the steel slag binder. In this article, two carbonation approaches, namely hot-stage carbonation and accelerated carbonation, were employed to leach the metals, and the influence mechanism on the metal sequential leachability of the binders composed of 80 wt% of EAF slag incorporating 20 wt% of Portland cement (PC) was revealed. The carbonate products, microstructures, and chemical states were investigated, and the results indicated that chromium, vanadium, and titanium gradually transformed into inactive phases after two carbonation approaches, while zinc appeared the opposite trend. The sequential leachability of chromium declined with the increase of the carbonation efficiency, in which the exchangeable chromium decreased from 1.99 mg/kg in the A2A binder to below the detection limit in the A2C binder and C2C binder. Hot-stage carbonation treatment facilitated particle agglomeration, minerals remodeling, and calcite formation. The carbonation curing of the steel slag paste resulted in the formation of amorphous CaCO3, calcite crystalline and Si-bearing hydrates that covered the pores of the matrix, and silicate structure with a higher disorder. The hot-stage carbonation and accelerated carbonation curing methods were adopted to jointly prevent the leaching of harmful metals and facilitate promising high-volume steel slag-based binders with structural densification and CO2 storage.Yaojun LiuJingrui FangSonghui LiuXiaopeng AnYanwen KangLan WangFrontiers Media S.A.articleaccelerated carbonation curingCO2 storagesequential leachabilitysteel slaghot-stage carbonationGeneral WorksAENFrontiers in Energy Research, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	accelerated carbonation curing CO2 storage sequential leachability steel slag hot-stage carbonation General Works A
spellingShingle	accelerated carbonation curing CO2 storage sequential leachability steel slag hot-stage carbonation General Works A Yaojun Liu Jingrui Fang Songhui Liu Xiaopeng An Yanwen Kang Lan Wang Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders
description	Carbonation is an effective method to promote the quality of the steel slag binder. In this article, two carbonation approaches, namely hot-stage carbonation and accelerated carbonation, were employed to leach the metals, and the influence mechanism on the metal sequential leachability of the binders composed of 80 wt% of EAF slag incorporating 20 wt% of Portland cement (PC) was revealed. The carbonate products, microstructures, and chemical states were investigated, and the results indicated that chromium, vanadium, and titanium gradually transformed into inactive phases after two carbonation approaches, while zinc appeared the opposite trend. The sequential leachability of chromium declined with the increase of the carbonation efficiency, in which the exchangeable chromium decreased from 1.99 mg/kg in the A2A binder to below the detection limit in the A2C binder and C2C binder. Hot-stage carbonation treatment facilitated particle agglomeration, minerals remodeling, and calcite formation. The carbonation curing of the steel slag paste resulted in the formation of amorphous CaCO3, calcite crystalline and Si-bearing hydrates that covered the pores of the matrix, and silicate structure with a higher disorder. The hot-stage carbonation and accelerated carbonation curing methods were adopted to jointly prevent the leaching of harmful metals and facilitate promising high-volume steel slag-based binders with structural densification and CO2 storage.
format	article
author	Yaojun Liu Jingrui Fang Songhui Liu Xiaopeng An Yanwen Kang Lan Wang
author_facet	Yaojun Liu Jingrui Fang Songhui Liu Xiaopeng An Yanwen Kang Lan Wang
author_sort	Yaojun Liu
title	Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders
title_short	Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders
title_full	Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders
title_fullStr	Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders
title_full_unstemmed	Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders
title_sort	effect of different co2 treatments on the metal leaching in steel slag binders
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/c03e173925ce4f74b08110f20e262ac6
work_keys_str_mv	AT yaojunliu effectofdifferentco2treatmentsonthemetalleachinginsteelslagbinders AT jingruifang effectofdifferentco2treatmentsonthemetalleachinginsteelslagbinders AT songhuiliu effectofdifferentco2treatmentsonthemetalleachinginsteelslagbinders AT xiaopengan effectofdifferentco2treatmentsonthemetalleachinginsteelslagbinders AT yanwenkang effectofdifferentco2treatmentsonthemetalleachinginsteelslagbinders AT lanwang effectofdifferentco2treatmentsonthemetalleachinginsteelslagbinders
_version_	1718425950730846208

Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders

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