Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS

Sludge management is one of the major challenges in mining activities. The direct disposal of contaminated mining sludge can bring severe damages to the environment and community. Solidification/stabilization (S/S) is a very efficient technology for the treatment of contaminated mining sludge becaus...

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Autores principales:	Traore Abdoul Fatah, Rongjun Zhang, Xiaosong Huang, Junjie Zheng, Yu Miao, Aamir Khan Mastoi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	mining sludge solidification/stabilization cement ground granulated blast furnace slag strength heavy metal leachability Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/5abe00841e7a4f3fa7285af28bb68012
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spelling	oai:doaj.org-article:5abe00841e7a4f3fa7285af28bb680122021-11-11T18:05:16ZStrength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS10.3390/ma142165241996-1944https://doaj.org/article/5abe00841e7a4f3fa7285af28bb680122021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6524https://doaj.org/toc/1996-1944Sludge management is one of the major challenges in mining activities. The direct disposal of contaminated mining sludge can bring severe damages to the environment and community. Solidification/stabilization (S/S) is a very efficient technology for the treatment of contaminated mining sludge because it improves the stability of sludge dumping sites and reduces the leachability of contaminants. Very few studies investigate the S/S of mining sludge, especially with high water content. This paper investigated the effectiveness of S/S for the treatment of mining sludge at high water content by using quick lime (CaO) activated ground granulated blast furnace slag (GGBS) in comparison to ordinary Portland cement (OPC). To evaluate the mechanical, leaching, and microstructural behavior of CMS at high water content stabilized by lime-activated GGBS and OPC, a series of laboratory experimental tests were performed. Experimental results indicated that increasing the dosage of binder led to increased strength and decreased leachability of the heavy metal. In contrast, an increase in the water content of the mixture resulted in a decrease in compressive strength and an increase in the leachability of heavy metals. On the other hand, lime-activated GGBS mixes had substantially better performance than OPC mixes in the aspect of strength development of treated mining sludge and showed comparable capability of heavy metal stabilization compared to OPC. The microstructural tests revealed the formation of different hydration products such as calcium silicate hydrate, calcium aluminum silicate hydrate, ettringite, hydrotalcite, and heavy metal complexes in CG and OPC mixes.Traore Abdoul FatahRongjun ZhangXiaosong HuangJunjie ZhengYu MiaoAamir Khan MastoiMDPI AGarticlemining sludgesolidification/stabilizationcementground granulated blast furnace slagstrengthheavy metal leachabilityTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6524, p 6524 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mining sludge solidification/stabilization cement ground granulated blast furnace slag strength heavy metal leachability Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	mining sludge solidification/stabilization cement ground granulated blast furnace slag strength heavy metal leachability Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Traore Abdoul Fatah Rongjun Zhang Xiaosong Huang Junjie Zheng Yu Miao Aamir Khan Mastoi Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS
description	Sludge management is one of the major challenges in mining activities. The direct disposal of contaminated mining sludge can bring severe damages to the environment and community. Solidification/stabilization (S/S) is a very efficient technology for the treatment of contaminated mining sludge because it improves the stability of sludge dumping sites and reduces the leachability of contaminants. Very few studies investigate the S/S of mining sludge, especially with high water content. This paper investigated the effectiveness of S/S for the treatment of mining sludge at high water content by using quick lime (CaO) activated ground granulated blast furnace slag (GGBS) in comparison to ordinary Portland cement (OPC). To evaluate the mechanical, leaching, and microstructural behavior of CMS at high water content stabilized by lime-activated GGBS and OPC, a series of laboratory experimental tests were performed. Experimental results indicated that increasing the dosage of binder led to increased strength and decreased leachability of the heavy metal. In contrast, an increase in the water content of the mixture resulted in a decrease in compressive strength and an increase in the leachability of heavy metals. On the other hand, lime-activated GGBS mixes had substantially better performance than OPC mixes in the aspect of strength development of treated mining sludge and showed comparable capability of heavy metal stabilization compared to OPC. The microstructural tests revealed the formation of different hydration products such as calcium silicate hydrate, calcium aluminum silicate hydrate, ettringite, hydrotalcite, and heavy metal complexes in CG and OPC mixes.
format	article
author	Traore Abdoul Fatah Rongjun Zhang Xiaosong Huang Junjie Zheng Yu Miao Aamir Khan Mastoi
author_facet	Traore Abdoul Fatah Rongjun Zhang Xiaosong Huang Junjie Zheng Yu Miao Aamir Khan Mastoi
author_sort	Traore Abdoul Fatah
title	Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS
title_short	Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS
title_full	Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS
title_fullStr	Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS
title_full_unstemmed	Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS
title_sort	strength and leaching behavior of contaminated mining sludge at high water content stabilized with lime activated ggbs
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5abe00841e7a4f3fa7285af28bb68012
work_keys_str_mv	AT traoreabdoulfatah strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs AT rongjunzhang strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs AT xiaosonghuang strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs AT junjiezheng strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs AT yumiao strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs AT aamirkhanmastoi strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs
_version_	1718431943154991104

Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS

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