Structural alterations and thermal behaviour of mechanically activated alunite ore
Journal of Thermal Analysis and Calorimetry, cilt.118, sa.2, ss.883-889, 2014 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 118 Sayı: 2
- Basım Tarihi: 2014
- Doi Numarası: 10.1007/s10973-014-3918-9
- Dergi Adı: Journal of Thermal Analysis and Calorimetry
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.883-889
- Anahtar Kelimeler: Alunite, Decomposition, Dehydration, Mechanical activation
- Bilecik Şeyh Edebali Üniversitesi Adresli: Hayır
Özet
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.