Meta kaolinite: Si & Al Precursors for Kalsi lite Synthesis

Eddy F. Yusslee and Nur Hazwani Dahon and Mohd Azrul Abd Rajak and Sazmal E. Arshad (2021) Meta kaolinite: Si & Al Precursors for Kalsi lite Synthesis. Ceramics-Silikáty, 65. pp. 363-367. ISSN 0862-5468

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Metakaolinite has been used as a silica and alumina precursor to synthesise kalsilite via the hydrothermal method with the addition of potassium hydroxide (KOH) as the potassium source. The effects of the KOH concentrations and reaction temperatures have been investigated. X-ray diffraction (XRD) diffractograms and field emission scanning electron microscope (FESEM) images showed the formation of hexagonal kalsilite after the hydrothermal reaction of metakaolinite at 190 °C in 1.25 M KOH for 24 hours. Kalsilite formed as a minor crystalline phase at a KOH concentration of less than 1.0 M KOH, while, at a higher KOH concentration, the crystallinity of the product increases. On the other hand, 190 °C was sufficient to convert metakaolinite to kalsilite. Besides, zeolite F and muscovite have been found as the dominant products at a lower KOH concentration and temperature, respectively.

Item Type: Article
Keyword: Hydrothermal , Zeolite F , Kaolinite , Crystals , Diffraction
Subjects: Q Science > Q Science (General) > Q1-390 Science (General)
Department: FACULTY > Faculty of Science and Natural Resources
Date Deposited: 17 Mar 2022 14:40
Last Modified: 17 Mar 2022 14:40

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