Mullite phase evolution in clay with hydrated or anhydrous AlF3

Rashad, Mohammed; Sabu, Ummen; Logesh, G.; Srishilan, C.; Lodhe, Mangesh; Joy, Anand; Balasubramanian, M.

doi:10.1016/j.jeurceramsoc.2020.06.045

Cited by 21 publications

(15 citation statements)

References 34 publications

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“…Ultimately, a limited number of crystal nuclei grow to become larger crystals. On the other hand, SiF 4 gas is generated through the reaction between AlF 3 and SiO 2 above 600°C, which plays a major role in increasing the nucleation rate of mullite 25 . Avoiding the evaporation of additives at high temperatures by placing the samples in a closed crucible should be indispensable for mullite growth to be a high aspect ratio.…”

Section: Resultsmentioning

confidence: 99%

Pore architectures and oil absorption behavior of porous mullite beads fabricated via dripping‐ice templating

Zhao

Hou

Zhang

et al. 2022

Int J Applied Ceramic Tech

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Porous mullite beads with a good spherical shape and a uniform size distribution of about 1.2 mm were fabricated by ice‐templating in combination with dripping methods. These internal pore structures exhibited a radially oriented laminar channel from the center of the sphere to the surface. With the decreasing of freeze temperature to −196°C, the thickness of pore walls and the width of pore decreased. The mullite grain morphology in the pore wall was also influenced by the frozen temperature. High aspect ratio mullite grain was formed in the pore wall of beads frozen at −25°C, while low aspect ratio mullite whiskers constituted the pore wall of beads frozen at −196°C. In addition, the obtained porous mullite beads exhibited a good oil adsorption performance under capillary force for kerosene, edible oil, and motor oil with adsorption values of 3.37, 4.07, and 4.04 g/g, respectively.

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Section: Resultsmentioning

confidence: 99%

Pore architectures and oil absorption behavior of porous mullite beads fabricated via dripping‐ice templating

Zhao

Hou

Zhang

et al. 2022

Int J Applied Ceramic Tech

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“…The presence of moisture and HF formed during the reaction can affect the topaz nucleation (Rashad et al, 2020). However, the characteristic peaks of AlF3 and topaz were not observed in the sample after heating to 600 C, which may be due to their low crystal order.…”

Section: Sintering Inhibition Mechanism Of Ccskmentioning

confidence: 96%

“…Moreover, the specific surface area gradually increased as the content of AlF3•3H2O increased. The changes of particle size and specific surface area indicate that structural transformation has taken place inside the particles, due to the reaction of SiO2 from metakaolin with aluminum fluoride (AlF3) generated after pyrolysis of AlF3•3H2O to produce SiF4 gas above 600 C, thereby disrupting structure of metakaolin (Abdel- Rehim, 1999;Moyer & Hughes, 2005;Rashad et al, 2020).…”

Section: Sintering Inhibition Of Ccskmentioning

confidence: 99%

“…The use of additives to inhibit the sintering of CCSK is an efficient and low-cost method compared to particlecoating treatments. Rashad et al (2020) reported that aluminium fluoride trihydrate (AlF 3 ⋅3H 2 O) has a greater structural impact on metakaolin particles during calcination. Therefore, AlF 3 ⋅3H 2 O was selected as the sintering inhibitor in this work.…”

mentioning

confidence: 99%

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Sintering inhibition and oil-absorption properties of calcined coal-series kaolin

Huang

Wang

et al. 2023

Clay miner.

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“…It is observed from the graph that there are mainly four types of phases such as Mullite (M), Quartz (Q), Cristobalite (C) and Zeolite phases (Z). Mullite [Al (Al0.83Si1.08O4.85)] is a rare alumino silicate mineral which is formed by post-clay genesis at elevated temperature and atmospheric pressure by a series of reactions in clay minerals (Rashad et al, 2020). The initial endothermic reaction is caused by dehydroxylation of the clay mineral and formation of an amorphous metakaolin phase followed by successive exothermic reactions.…”

Section: Mineralogy Study By X-ray Diffraction (Xrd)mentioning

confidence: 99%

Geopolymer Cement: an Initiative towards the Replacement of Grey Cement by Green Cement in Future

Kumar¹,

Kumar²

2021

J. build. mater. struct.

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The emissions of greenhouse gases such as carbon dioxide from the production of Ordinary Portland Cement and Blended Portland Cement have widely affected the environment with increase in infrastructure development worldwide. Secondly, due to the continuous mining of limestone for the production of cement there is also simultaneous depletion of natural resources and hardly will it last up to maximum 40 years. Hence we need to switch over to some other alternate binders for constructions purpose in future. Geopolymer Cement is one of the inventions which is produced by a polymeric chain reaction of alkali-activated alumino-silicate materials better known as alkali activator (NaOH/Na2SiO3) binders with the industrial by-product materials such as Fly Ash, Rice Husk Ash, Slag, Crusher Dust etc. and provides high compressive strength which is comparable to BPC and reduces the carbon foot print. The objective of our study is to prepare the low CO2 foot print green Geopolymer Cement which may substitute the Ordinary Portland Cement and Blended Portland Cement in future and will helpful to reduce the greenhouse effect up to some extent and takes an initiative towards the green revolution movement.

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Mullite phase evolution in clay with hydrated or anhydrous AlF3

Cited by 21 publications

References 34 publications

Pore architectures and oil absorption behavior of porous mullite beads fabricated via dripping‐ice templating

Pore architectures and oil absorption behavior of porous mullite beads fabricated via dripping‐ice templating

Sintering inhibition and oil-absorption properties of calcined coal-series kaolin

Geopolymer Cement: an Initiative towards the Replacement of Grey Cement by Green Cement in Future

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