The thermal dehydroxylation of kaolinite using thermogravimetric analysis and Controlled rate thermal analysis

The aim of this work was to identify parameters that could influence the conversion kaolinite into metakaolinite. To end, dehydroxylation four kaolinites, using controlled rate thermal analysis (CRTA) and thermogravimetric (TGA), investigated. X-ray diffraction (XRD) Fourier transform infra-red (FTIR) were used confirm kaolinitic nature samples. Their crystallinity evaluated Hinckley index from XRD patterns transmission electron microscopy (TEM) for morphological observation clay platelets. analyses samples indicate, all samples, low defects as revealed by amount adsorbed water on surface. temperature both techniques influenced sample particle size. It observed increase resulted in highdehydroxylation temperature. Also, platelets size temperature, is proposed. All results indicate are be control metakaolinite.
 Keywords: Kaolinite; Crystallinity, Dehydroxylation; Thermal