The thermal decomposition kinetics of the Reşadiye (Tokat/Turkey) bentonite and its fractions

Abstract

The untreated bentonite was separated into three fractions by subsequent precipitations from its suspension, during different periods. One fraction remained in suspension during infinite period. Hence, a total of four fractions were separated. The activation energies, and pre-exponential factors for the dehydration, dehydroxylation and calcination, of a total of five samples, comprising tile untreated bentonite were determined by the Coats — Redfern procedure, using the thermogravimetric data. 'Die decompositions were thought to obey a first order rate law. Their rate equations were written by using the determined quantities.