Abstract
Decomposition of IR spectra of kaolin samples after their treatment in the ranges 100°C and 600–1000°C was carried out by the principal components method. Three principal components (PCs) have been identified according to the number of main stages of the structural-phase transformation of kaolinite depending on the processing temperature: dehydroxylation of kaolinite (PC1), transformation of metakaolinite (PC2), and crystallization of a new phase (PC3). The kaolin samples were divided into three groups according to their factor loadings for the three PCs. Transformation of metakaolinite was revealed by the change in the coordinates of IR frequencies for the fi rst and third PCs, to which bonds of =Al–O in tetrahedral and octahedral coordination and ≡Si–O–Si≡ bonds (siloxane bridge) were attributed. The structural-phase transformation stages of kaolinite, depending on the processing temperature and dispersion of the initial kaolin fractions, were in good agreement with the change in the chemical activity of the heat-treatment products
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