Kinetic analysis of non-isothermal calcination TG curves of natural Turkish dolomites


Erol Taygun M. M. , Erol Taygun M. M.

Thermochimica Acta, vol.232, no.2, pp.225-232, 1994 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 232 Issue: 2
  • Publication Date: 1994
  • Doi Number: 10.1016/0040-6031(94)80062-6
  • Journal Name: Thermochimica Acta
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.225-232
  • Istanbul Technical University Affiliated: Yes

Abstract

Calcination kinetics of six dolomite samples originating from different parts of Turkey were investigated by using the non-isothermal thermogravimetry technique. Calcination TG curves of samples were obtained under two different atmospheres of (1) pure nitrogen and (2) a mixture consisting of 15 vol.% CO2 and 85 vol.% dry air, by using a constant heating rate of 10 K min-1. Kinetic analysis of the curves was achieved by applying four different methods of calculation; also, 14 different model equations of possible solid-state rate controlling mechanisms were considered. Arrhenius parameters E and A and the model function f(α) that best describes the reaction mechanism were evaluated for the decomposition reactions of both MgCO3 and CaCO3 components of samples. A computer program in basic which enables regression analysis to be carried out was used to obtain kinetic results from experimental non-isothermal TG data. It was observed that besides differences in the chemical composition of samples, gaseous atmosphere and the method of calculation influenced the results obtained. © 1994.