Preparation of meta phase of kaolinite as a precursor for geopolymer adsorbent fabrication

Eldin, Hoda S.; Abdullah, Nabil; Ismail, Mahmoud F.; Hashem, Ahmed I.

doi:10.14382/epitoanyag-jsbcm.2022.13

Cited by 1 publication

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“…The preparation of metakaolin involves the calcination of kaolin, which produces highly reactive metakaolin. Amorphous aluminosilicate (Al 2 O 3 .SiO 2 ) is left behind after removing structurally bound water in kaolinite (Al 2 O 3 .SiO 2 .2H 2 O) through calcination [9][10][11]. The calcination temperature for producing the reactive metakaolin varies from 500 to 900 °C, subject to the kaolinite source [12,13].…”

Section: Introductionmentioning

confidence: 99%

Highly reactive metakaolin: a multi-parameter optimization by response surface methodology

Hamisi,

Jande,

Hilonga

2023

Eng. Res. Express

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Multi-parameter effect consideration during metakaolin conversion gives the best optimum processing conditions. Kaolin deposits have different properties, which makes it vital to establish optimum conditions for a distinctive kaolin deposit. The Response Surface Methodology under Box-Behnken Design has been adopted in the current study to optimize the processing conditions for kaolin-to-metakaolin conversion. The temperature of 765.608 °C, the rate of 9.775°C/min, and 6.465 h of soaking were the optimum conditions for yielding the highly reactive (1382.15mg Ca (OH)2/g) metakaolin. The typical reflections at 2θ of 14.32 and 29.03°attested to the existence of kaolinite in the kaolin sample, which then disappeared in the optimized metakaolin as confirmed by X-ray diffraction. The Fourier-transformation infrared spectroscopy confirmed the existence of kaolinite in the sample with reflections at the bands 3692, 3650, and 3620 cm-1 which disappeared to form a broad band in this region, which validates the formation of reactive amorphous metakaolin.

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