Hydrothermal conversion of kaolin to kalsilite (kalSiO₄): the effect of K₂CO₃ concentrations

Eddy Mohd Farid Mohd Yusslee and Nur Hazwani Dahon and Mohd Azrul Abdul Rajak and Sazmal Effendi Arshad (2021) Hydrothermal conversion of kaolin to kalsilite (kalSiO₄): the effect of K₂CO₃ concentrations.

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Abstract

Kaolin was used as a silica and alumina precursor in the hydrothermal synthesis of kalsilite with the addition of potassium carbonate (K₂CO₃) as a potassium source. The effects of different K₂CO₃ concentrations have been studied. After a 24-hour hydrothermal reaction at 200°C, kaolin treated with 1.25M K₂CO₃ shows 28.7°, 34.2°, and 42.3° as the most significant peaks under X-ray diffraction (XRD) which corresponds to hexagonal kalsilite. In addition, Field emission scanning electron microscopy (FESEM) images also revealed hexagonal particles proving the formation of the desired kalsilite. At K₂CO₃ concentrations less than 1.0M, boehmite and bayerite were identified to be the primary products while kalsilite forms as a minor crystalline phase. Hexagonal kalsilite was observed as the major product at higher (>1.0M) K₂CO₃ concentration while the reaction kept constant at 200°C.

Item Type:	Proceedings
Keyword:	Kaolinite, Crystallization, Potassium aluminum silicate, Diffraction
Subjects:	Q Science > Q Science (General) > Q1-390 Science (General) T Technology > TN Mining engineering. Metallurgy > TN1-997 Mining engineering. Metallurgy
Department:	CENTRE > Preparation Centre for Science and Technology
Depositing User:	SITI AZIZAH BINTI IDRIS -
Date Deposited:	25 Oct 2024 09:37
Last Modified:	25 Oct 2024 09:37
URI:	https://eprints.ums.edu.my/id/eprint/41631

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