Using inorganic polymer to reduce leach rates of metals from brown coal fly ash

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

doi:10.1016/j.mineng.2003.10.024

Cited by 39 publications

(22 citation statements)

References 7 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 issue has been addressed in an engineering context [5,6,35] by the use of leaching studies, which showed that in general, species which are able to form oxyanions are the most likely to be problematic. This conclusion has also been supported by the outcomes of a broader survey of toxic element immobilization in geopolymer matrices [50].…”

Section: Toxicity and Aams-the Role Of Heavy Metalsmentioning

confidence: 99%

Chemical Research and Climate Change as Drivers in the Commercial Adoption of Alkali Activated Materials

Deventer

Provis

Duxson³

et al. 2010

Waste Biomass Valor

398

141

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Portland cement production has been identified as a primary contributor to the world's Greenhouse gas emissions, calculated at around 5-8% of all manmade emissions worldwide. The majority of these emissions are inherent to the chemistry of cement and the high-temperature processing required for its synthesis, and so can only be avoided by radical changes in construction materials chemistry and synthesis pathways. Inorganic polymer (including ''geopolymer'') binders provide an alternative to traditional cements with approximately 80% less CO 2 emissions, and are derived from industrial waste materials such as fly ash and metallurgical slags, which additionally provide a means of valorizing these wastes. This paper reviews the technical and commercial factors driving the growing commercial adoption of geopolymer technology, and explains that an understanding of the chemistry and mechanisms of geopolymer synthesis is pivotal for the optimal mix design of ''green'' concretes in industry. Demand pull by a carbon conscious market at a time of growing public awareness of climate change continues to be the key driver for the short term adoption of geopolymer concrete. A detailed chemical understanding of the properties of geopolymers, such as setting time, workability and durability, plays an enabling role in the commercialization process.

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“…Environmental and economic concerns have led to an ongoing research to find effective ways to utilize the abundant and easily available RM and FA [7]. Although fly ash was reported leaching heavy metals [21], leaching rates of metals from brown coal fly ash was reduced using inorganic polymer [22], and solidification/stabilization of arsenic containing solid wastes was achieved using portland cement, fly ash and polymeric materials [23]. The presence of various strongly active constituents in FA and RM also makes them one of the most suitable materials for phosphate sorption.…”

Section: Introductionmentioning

confidence: 99%

Phosphate removal from aqueous solutions using raw and activated red mud and fly ash

Liu

Luan

et al. 2006

Journal of Hazardous Materials

303

136

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The effect of acidification and heat treatment of raw red mud (RM) and fly ash (FA) on the sorption of phosphate was studied in parallel experiments. The result shows that a higher efficiency of phosphate removal was acquired by the activated samples than by the raw ones. The sample prepared by using the RM stirred with 0.25 M HCl for 2 h (RM0.25), as well as another sample prepared by heating the RM at 700• C for 2 h (RM700), registered the maximum removal of phosphate (99% removal of phosphate). This occurred when they were used in the phosphate sorption studies conducted at pH 7.0 and 25• C with the initial PO 4 3− concentration of 155 mg P/l. The FA samples treated in the same way described above can achieve 7.0 and 8.2 mg P/l phosphate removal for FA0.25 and FA700 respectively, corresponding to 45.2% and 52.9% removal. The activated materials performed higher phosphate removal over broader pH range compared with the raw ones. The influences of various factors, such as initial pH and initial phosphate concentration on the sorption capacity were also studied in batch equilibration technique. Solution pH significantly influenced the sorption. Each sample achieved the maximal removal of phosphate at pH 7.0. The amount of phosphate removal increased with the solute concentration. The Freundlich and Langmuir models were used to simulate the sorption equilibrium. The results indicate that the Langmuir model has a better correlation with the experimental data than the Freundlich model.

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Using inorganic polymer to reduce leach rates of metals from brown coal fly ash

Cited by 39 publications

References 7 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

Chemical Research and Climate Change as Drivers in the Commercial Adoption of Alkali Activated Materials

Phosphate removal from aqueous solutions using raw and activated red mud and fly ash

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