Structural alterations and thermal behaviour of mechanically activated alunite ore

Alunite, a potassium alum, was activated mechanically in a planetary ball mill, and the effects of mechanical activation on the structure of alunite have been studied by particle size analysis, scanning electron microscopy, X-ray diffraction and the Fourier transform infrared spectroscopy. The resul...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2014-11, Vol.118 (2), p.883-889
Main Authors: Tunç, Tuğba, Apaydin, Fatih, Yildiz, Kenan
Format: Article
Language:English
Subjects:
Activated
Alunite
Analysis
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Dehydration
Differential thermal analysis
Diffraction
Infrared spectroscopy
Inorganic Chemistry
Measurement Science and Instrumentation
Mechanical activation
Physical Chemistry
Polymer Sciences
Thermal analysis
X-rays
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Summary:Alunite, a potassium alum, was activated mechanically in a planetary ball mill, and the effects of mechanical activation on the structure of alunite have been studied by particle size analysis, scanning electron microscopy, X-ray diffraction and the Fourier transform infrared spectroscopy. The results show that the activation procedure led to amorphisation and structural disordering in the alunite structure. Thermal decompositions of both non-activated and activated alunite samples have been studied by thermogravimetry (TG) and differential thermal analysis (DTA). In non-activated alunite, the dehydration reaction starts after 500 °C. On the contrary, the dehydration of mechanically activated alunite was started after 100 °C. It is observed by X-ray diffraction analysis and thermal analysis that dehydration and desulphation temperatures of alunite decreased with mechanical activation, owing to amorphisation and structural disordering in alunite.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-014-3918-9