Eluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer

The fly ash from powerplants used for coal mine end backfilling can effectively reduce the impact of ground fly ash accumulation on the environment. However, due to the long-term action of the overlying strata and groundwater, when the backfilling body is broken, heavy metals will also be leached, t...

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Autores principales:	Peng Shi, Yuan Zhang, Qingfu Sun, Xupeng Ta
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fly-ash-based porous geopolymer dynamic eluviation static leaching 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/b02f4933f7f74a2ca996f31527a1f689
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spelling	oai:doaj.org-article:b02f4933f7f74a2ca996f31527a1f6892021-11-25T18:14:26ZEluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer10.3390/ma142268841996-1944https://doaj.org/article/b02f4933f7f74a2ca996f31527a1f6892021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/6884https://doaj.org/toc/1996-1944The fly ash from powerplants used for coal mine end backfilling can effectively reduce the impact of ground fly ash accumulation on the environment. However, due to the long-term action of the overlying strata and groundwater, when the backfilling body is broken, heavy metals will also be leached, thus having an impact on the groundwater. Therefore, in this paper, the eluviation and leaching of elements from a broken fly-ash-based porous geopolymer is studied. The fly-ash-based geopolymer material was prepared to perform a dynamic eluviation and static leaching test, and it was found that the amount of Cu and Zn in the leachate was less abundant, whereas Pb was more abundant, but far less than the limit of the Class III groundwater quality standard. An acidic environment and a smaller solid–liquid ratio can promote the leaching of Cu and Zn, while the leaching of Pb is basically unaffected by the pH value. Moreover, the amount of Cu, Zn, and Pb in the lixivium increased with the increase in leaching time, and the amount of Cu and Zn in the lixivium was still low after 150 h of leaching, whereas the amount of Pb was high, approaching the limit value of the Class III groundwater quality standard, showing a tendency to increase after 100 h of leaching. A leaching orthogonal experiment was designed, and the results showed that the main order of each factor affecting the leaching of heavy metals from the fly-ash-based geopolymer was grain size > pH > solid–liquid ratio; thus, the leaching of heavy metals from fly-ash-based geopolymer can be controlled, which is significant with respect to the extensive use of fly-ash materials underground.Peng ShiYuan ZhangQingfu SunXupeng TaMDPI AGarticlefly-ash-based porous geopolymerdynamic eluviationstatic leachingTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6884, p 6884 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fly-ash-based porous geopolymer dynamic eluviation static leaching 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	fly-ash-based porous geopolymer dynamic eluviation static leaching 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 Peng Shi Yuan Zhang Qingfu Sun Xupeng Ta Eluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer
description	The fly ash from powerplants used for coal mine end backfilling can effectively reduce the impact of ground fly ash accumulation on the environment. However, due to the long-term action of the overlying strata and groundwater, when the backfilling body is broken, heavy metals will also be leached, thus having an impact on the groundwater. Therefore, in this paper, the eluviation and leaching of elements from a broken fly-ash-based porous geopolymer is studied. The fly-ash-based geopolymer material was prepared to perform a dynamic eluviation and static leaching test, and it was found that the amount of Cu and Zn in the leachate was less abundant, whereas Pb was more abundant, but far less than the limit of the Class III groundwater quality standard. An acidic environment and a smaller solid–liquid ratio can promote the leaching of Cu and Zn, while the leaching of Pb is basically unaffected by the pH value. Moreover, the amount of Cu, Zn, and Pb in the lixivium increased with the increase in leaching time, and the amount of Cu and Zn in the lixivium was still low after 150 h of leaching, whereas the amount of Pb was high, approaching the limit value of the Class III groundwater quality standard, showing a tendency to increase after 100 h of leaching. A leaching orthogonal experiment was designed, and the results showed that the main order of each factor affecting the leaching of heavy metals from the fly-ash-based geopolymer was grain size > pH > solid–liquid ratio; thus, the leaching of heavy metals from fly-ash-based geopolymer can be controlled, which is significant with respect to the extensive use of fly-ash materials underground.
format	article
author	Peng Shi Yuan Zhang Qingfu Sun Xupeng Ta
author_facet	Peng Shi Yuan Zhang Qingfu Sun Xupeng Ta
author_sort	Peng Shi
title	Eluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer
title_short	Eluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer
title_full	Eluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer
title_fullStr	Eluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer
title_full_unstemmed	Eluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer
title_sort	eluviation and leaching of elements from broken fly-ash-based porous geopolymer
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b02f4933f7f74a2ca996f31527a1f689
work_keys_str_mv	AT pengshi eluviationandleachingofelementsfrombrokenflyashbasedporousgeopolymer AT yuanzhang eluviationandleachingofelementsfrombrokenflyashbasedporousgeopolymer AT qingfusun eluviationandleachingofelementsfrombrokenflyashbasedporousgeopolymer AT xupengta eluviationandleachingofelementsfrombrokenflyashbasedporousgeopolymer
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Eluviation and Leaching of Elements from Broken Fly-Ash-Based Porous Geopolymer

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