Reduction of metal leaching in brown coal fly ash using geopolymers

Bankowski, Piotr; Zou, Linda; Hodges, Raymond John

doi:10.1016/j.jhazmat.2004.06.034

Cited by 82 publications

(39 citation statements)

References 11 publications

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“…The compressive resistance decrease almost a 50%, that is, metakaolin based geopolymers have a poor resistant structure. This is the reason because the metakaolin is used in gepolymer with other aluminium and silicon source materials (16,(19)(20)(21)(22)(23). It must be taken into account that the amorphous phase of MK (50.2%) is lower than the FA (72.3%), so the activation of the fly ash during the geopolymerization reaction is slower (43), with the consequent lower compression strength.…”

Section: Physical and Mechanical Propertiesmentioning

confidence: 99%

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Properties of fly ash and metakaolín based geopolymer panels under fire resistance tests

Luna-Galiano¹,

Cornejo²,

Leiva³

et al. 2015

Mater. construcc.

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This paper presents the results of a study about the effect of fire on geopolymer paste composed of fly ashes, metakaolin and sodium silicate. 2 cm thick, 28 cm high and 18 cm wide panels were filled with the paste obtained. After 28 days of curing at 20 °C and 45% of relative humidity, different tests were carried out in the geopolymers: physico-chemical (density, water absorption, porosity), mechanical (flexural and compressive strength), fire resistance and environmental (leaching and radioactivity). The panels manufactured have been compared with other commercial panels in order to determine the recycling possibilities of fly ashes in manufacturing new fire-insulating geopolymers. The panels obtained can be utilized for the production of interior wall materials, with a good physical, mechanical, fire resistant properties without any environmental problem. RESUMEN: Propiedades de paneles geopoliméricos basados en ceniza volante y metacaolín bajo ensayos de resistencia al fuego.Este documento presenta los resultados de un estudio sobre el efecto del fuego sobre pastas de geopolímeros compuestas de cenizas volantes, metacaolín y silicato sódico. Con la pasta obtenida se han rellenado paneles de dimensiones 2 cm de espesor, 28 cm de altura y 18 cm de ancho. Tras 28 días de curado a 20 °C y un 45% de humedad relativa, diferentes ensayos fueron realizados en los geopolímeros obtenidos: fisicoquímicos (densidad, absorción de agua, porosidad), mecánicos (resistencia a compresión y a flexión), de resistencia al fuego y medioambientales (lixiviación y radioactividad). Los paneles fabricados han sido comparados con paneles comerciales para determinar las posibilidades de reciclaje de las cenizas volantes para la fabricación de nuevos productos geopoliméricos con propiedades aislantes al fuego. Los paneles obtenidos pueden ser utilizados para la producción de paredes interiores, con buenas propiedades físicas, mecánicas y de resistencia al fuego sin ningún problema medioambiental.

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Section: Physical and Mechanical Propertiesmentioning

confidence: 99%

“…Metakaolin is used with other materials since metakaolin alone produces a weaken structure (16,(19)(20)(21)(22)(23)(24). However, metakaolin is usual in the geopolymer production to manufacture hydroceramic compounds, adhesive and coating (6).…”

Section: Introductionmentioning

confidence: 99%

Properties of fly ash and metakaolín based geopolymer panels under fire resistance tests

Luna-Galiano¹,

Cornejo²,

Leiva³

et al. 2015

Mater. construcc.

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“…This has been confirmed by various leaching tests and the determination of the amount of lead fixed by activated fly ash systems. Bankowskia et al [54] used alkali-activated metakaolin for stabilization of brown coal ash containing high concentrations of heavy metals. Phair and Van Deventer [55] noticed that the immobilization of Cu is generally less effective than lead.…”

Section: Stabilization/solidification Of Hazardous Wastes With Alkalimentioning

confidence: 99%

Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements

Shi

Fernández-Jiménez

2006

Journal of Hazardous Materials

329

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“…[4][5][6] 지오폴리머 기술은 산업부산물의 재활 용이 가능하고, 5,7-10) 유해중금속의 고정화가 가능하며, [11][12][13] 나노 금속산화물을 합성할 수 있는 3가지 큰 특징이 있 다. 14) 중금속 고정화는 중금속 이온이 지오폴리머를 형성 하는 실리카나 알루미나 등과 반응하여 불용성화합물을 형성하거나 지오폴리머 기재 내의 양이온 위치에 치환 되는 등에 의해서 가능한 것으로 밝혀지고 있다.…”

Section: -3)unclassified

Preparation and Characterization of the Mine Residue-based Geopolymeric Ceramics

Son¹,

Lee²,

Kim³

et al. 2011

Korean. J. Mater. Res.

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The goal of the present work was to investigate the development of a geopolymeric ceramic material from a mixture of mine residue, coal fly ash, blast furnace slag, and alkali activator solution by the geopolymer technique. The results showed that the higher compressive strength of geopolymeric ceramic material increased with an increase in active filler (blast furnace slag + coal fly ash) contents and with a reduction of mine residue contents. The geopolymeric ceramic had very high early age strength. The compressive strength of the geopolymeric ceramic depended on the added active filler content. The maximum compressive strength of the geopolymeric ceramic containing 20 wt.% mine residue was 141.2 MPa. The compressive strength of geopolymeric ceramic manufactured by adding mine residue was higher than that of portland cement mortar, which is 60 MPa, when cured for 28 days. SEM observation showed the possibility of having amorphous aluminosilicate gel within geopolymeric ceramic. XRD patterns indicate that the geopolymeric ceramic was composed of amorphous aluminosilicate, calcite, quartz, and muscovite. The Korea Standard Leaching Test (KSLT) was used to determine the leaching potential of the geopolymeric ceramic. The amounts of heavy metals were noticeably reduced after the solidification of mine residue with active filler.

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Reduction of metal leaching in brown coal fly ash using geopolymers

Cited by 82 publications

References 11 publications

Properties of fly ash and metakaolín based geopolymer panels under fire resistance tests

Properties of fly ash and metakaolín based geopolymer panels under fire resistance tests

Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements

Preparation and Characterization of the Mine Residue-based Geopolymeric Ceramics

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