Thermal treatment of kaolin clay to obtain metakaolin

Ilić, Biljana; Mitrović, Aleksandra; Miličić, Ljiljana

doi:10.2298/hemind100322014i

Cited by 213 publications

(88 citation statements)

References 10 publications

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“…This study has looked into the use of metakaolin, a product of the calcination of kaolin clay as a partial replacement of cement in concrete. Metakaolin is produced from heat treating (calcination) of Kaolin clay, one of the most abundant soil minerals formed from the chemical weathering of rocks (feldspar rocks) in hot moist climate [1]. Metakaolin is a highly reactive alumino silicate pozzolan that is rich in Silica and Alumina.…”

Section: Introductionmentioning

confidence: 99%

Structural behaviour of metakaolin infused concrete structure

Akinyele¹,

Odunfa²,

Famoye³

et al. 2017

Nig. J. Tech.

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This work researched into the use of metakaolin as a partial substitute for cement in concrete, metakaolin was obtained by the calcination of kaolin clay to about 700 0 C Cement was replaced with the metakaolin at 0,5,10,15,20, 25, 30, and 35% at water cement ratio of 0.5. Tests such as chemical analysis, compressive strength, flexural or modulus of rupture and bond strength were carried out on the concrete samples. Chemical analysis results showed that the metakaolin is a class "N" pozzolan, while the mechanical test showed that the strength of concrete increased from 5% to 20% replacement, and the strength peaked at 20%, but decreased above this value; concrete made with metakaolin performed better than the control sample at all the percentage replacements used in this work.

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Section: Introductionmentioning

confidence: 99%

Structural behaviour of metakaolin infused concrete structure

Akinyele¹,

Odunfa²,

Famoye³

et al. 2017

Nig. J. Tech.

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“…In contrast, the samples produced at lower temperatures are much less stable and lose up to 45% of their original mass. Here, the weight losses can be separated in three (although strongly overlapping) steps between 25 and 100 °C, 110 and ≈450 °C, and finally ≈450 to 900 °C [42]. The first loss can be assigned to the desorption of water adsorbed in the pores of the hybrid clay materials.…”

Section: Resultsmentioning

confidence: 99%

New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water

Unuabonah¹,

Nöske²,

Weber³

et al. 2019

Beilstein J. Nanotechnol.

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A new micro/mesoporous hybrid clay nanocomposite prepared from kaolinite clay, Carica papaya seeds, and ZnCl2 via calcination in an inert atmosphere is presented. Regardless of the synthesis temperature, the specific surface area of the nanocomposite material is between ≈150 and 300 m2/g. The material contains both micro- and mesopores in roughly equal amounts. X-ray diffraction, infrared spectroscopy, and solid-state nuclear magnetic resonance spectroscopy suggest the formation of several new bonds in the materials upon reaction of the precursors, thus confirming the formation of a new hybrid material. Thermogravimetric analysis/differential thermal analysis and elemental analysis confirm the presence of carbonaceous matter. The new composite is stable up to 900 °C and is an efficient adsorbent for the removal of a water micropollutant, 4-nitrophenol, and a pathogen, E. coli, from an aqueous medium, suggesting applications in water remediation are feasible.

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“…The mullite phase was not found in M1 and in M2's raw material; the mullite contribution was minor. After thermally treating kaolin at 873-973 K, the characteristic peaks for kaolinite (2h 12.41°, 20.21°and 25.49°) should disappear, while peaks assigned to quartz (2h 21.22°and 27.45°) should remain unchanged [22]. The occurrence of a kaolinite (Al 2 Si 2-O 5 (OH) 4 ) phase, which indicates the incomplete transformation of kaolinite into metakaolinite, was noted for M2.…”

Section: Geopolymer Characterisation Methodsmentioning

confidence: 97%

Thermal phenomena of alkali-activated metakaolin studied with a negative temperature coefficient system

Mierzwiński

Łach

Hebda

et al. 2019

J Therm Anal Calorim

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The properties of alkali-activated materials (AAMs) depend on both the type of raw material used and their production procedure. This article presents an inexpensive and easily accessible method, based on using thermistors with a negative temperature coefficient, to analyse phenomena during the geopolymerisation process of AAMs. The described method enables prediction of the final physical and mechanical properties of tested materials and allows unambiguous determination of the quality of raw metakaolin materials in terms of their suitability for geopolymerisation processes and AAM production. This statement was proved by comparing AAMs formed based on metakaolin from three different sources. This article also describes the results of the mineralogical analysis, density, particle size distribution and morphology of the three metakaolins. In addition, the compression strength and FT-Raman spectroscopy of the AAM produced are described. Even though all materials were referred to as metakaolin, the results of this study showed that calcined materials can significantly differentiate the geopolymerisation process and final physical and mechanical properties of AAM.

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Thermal treatment of kaolin clay to obtain metakaolin

Cited by 213 publications

References 10 publications

Structural behaviour of metakaolin infused concrete structure

Structural behaviour of metakaolin infused concrete structure

New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water

Thermal phenomena of alkali-activated metakaolin studied with a negative temperature coefficient system

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