Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Abdoul Fatah, Traore, Zhang, Rongjun, Huang, Xiaosong, Zheng, Junjie, Miao, Yu, Mastoi, Aamir Khan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585284/
https://www.ncbi.nlm.nih.gov/pubmed/34772044
http://dx.doi.org/10.3390/ma14216524
_version_ 1784597653724594176
author Abdoul Fatah, Traore
Zhang, Rongjun
Huang, Xiaosong
Zheng, Junjie
Miao, Yu
Mastoi, Aamir Khan
author_facet Abdoul Fatah, Traore
Zhang, Rongjun
Huang, Xiaosong
Zheng, Junjie
Miao, Yu
Mastoi, Aamir Khan
author_sort Abdoul Fatah, Traore
collection PubMed
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 Online
Article
Text
id pubmed-8585284
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-85852842021-11-12 Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS Abdoul Fatah, Traore Zhang, Rongjun Huang, Xiaosong Zheng, Junjie Miao, Yu Mastoi, Aamir Khan Materials (Basel) Article 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. MDPI 2021-10-29 /pmc/articles/PMC8585284/ /pubmed/34772044 http://dx.doi.org/10.3390/ma14216524 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Abdoul Fatah, Traore
Zhang, Rongjun
Huang, Xiaosong
Zheng, Junjie
Miao, Yu
Mastoi, Aamir Khan
Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS
title 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_short 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
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585284/
https://www.ncbi.nlm.nih.gov/pubmed/34772044
http://dx.doi.org/10.3390/ma14216524
work_keys_str_mv AT abdoulfatahtraore strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs
AT zhangrongjun strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs
AT huangxiaosong strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs
AT zhengjunjie strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs
AT miaoyu strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs
AT mastoiaamirkhan strengthandleachingbehaviorofcontaminatedminingsludgeathighwatercontentstabilizedwithlimeactivatedggbs