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The kinetic analysis of the thermal decomposition of kaolinite by DTG technique

✍ Scribed by Petr Ptáček; František Šoukal; Tomáš Opravil; Jaromír Havlica; Jiří Brandštetr

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
395 KB
Volume
208
Category
Article
ISSN
0032-5910

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✦ Synopsis

The thermal decomposition of kaolinite was studied by differential thermogravimetry (DTG) technique under non-isothermal conditions. Samples of industrially treated (washed) kaolin with high content of the medium ordered kaolinite were calcined using a heating rate from 1 to 40 K min -1 . The apparent activation energy and frequency factor for the dehydroxylation of kaolinite was evaluated by Kissinger method as 195 ± 2 kJ × mol -1 and (8.58 ± 0.33) × 10 14 s -1 , respectively. Avrami exponent of the process was estimated using Kissinger empirical kinetic models and Carne equation.

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