Hydrothermal Formation of a Kaolinite-Like Product from Noncrystalline Aluminosilicate Gels
- 1 December 1981
- journal article
- Published by Cambridge University Press (CUP) in Clays and Clay Minerals
- Vol. 29 (6) , 446-450
- https://doi.org/10.1346/ccmn.1981.0290605
Abstract
Noncrystalline aluminosilicate gels with Al2O3/(Al2O3 + SiO2) weight ratios from 0.3 to 0.5 were reacted in 0.1 N KOH at temperatures varying from 125° to 175°C. The pH of the solutions dropped sharply with increasing gel:solution ratios, indicating that the coordination number of Al in the products changed from IV to VI. The degree of hydrolysis appeared to be higher with KOH than with NaOH. X-ray powder diffraction and infrared spectroscopy showed that disordered kaolinite was the only crystalline product formed. Thermal data and surface area measurements indicated that the kaolinite was formed by a condensation process.Keywords
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