Thermal behavior of natural dolomite

Abstract

The thermodynamic analysis of the thermal decomposition reaction of carbonates showed that the temperatures of thermal stability of dolomite and magnesium carbonate are very similar. Kinetics of isothermal and non-isothermal decompositions of natural dolomite in air atmosphere were investigated. Under the examined conditions, dolomite decomposed in a one-stage process. The final solid products of dolomite's decomposition were calcium and magnesium oxides. The average value of isoconversional apparent activation energy of non-isothermal decomposition was 205.60 kJ mol-1. The kinetics of decomposition can be described by the power-law model P2/3 with ln(A) = 20.98 for the extent of reaction α < 0.77 and by two-dimensional diffusion model D2 with ln(A) = 21.12 for α > 0.77.