Dehydration Kinetics of Şebinkarahisar (Gedehor) Alunite Ore in a Fluidized-Bed Reactor


KÜÇÜK A., GÜLABOĞLU M. Ş. , Bayrakçeken S.

Industrial and Engineering Chemistry Research, vol.43, no.4, pp.962-968, 2004 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 4
  • Publication Date: 2004
  • Doi Number: 10.1021/ie0300979
  • Journal Name: Industrial and Engineering Chemistry Research
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.962-968
  • Erzincan Binali Yildirim University Affiliated: No

Abstract

The dehydration kinetics of Şebinkarahisar (Gedehor) alunite ore in a fluidized bed was investigated. It was observed that the dehydration reaction rate increased with increasing temperature and decreasing water vapor pressure. However, the particle size and air flow rate did not have a significant influence on the dehydration rate. On the basis of these conversion-time relations, the dehydration process was assumed to be controlled by chemical reaction. By nonlinear regression analysis, the Avrami model was found to fit the kinetic data best. n ∼ 1, the high activation energy value (209 kJ mol-1), and scanning electron microscopic photographs of the calcined ore supported this control mechanism.