Mechanism of growth of MgO and CaCO3 during a dolomite partial decomposition

Galai, Haikel; Pijolat, Michèle; Nahdi, Kaïs; Trabelsi‐Ayadi, Malika

doi:10.1016/j.ssi.2007.05.013

Cited by 57 publications

(37 citation statements)

References 21 publications

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“…4c, CaO crystals had a tendency to migrate toward the interior of the particles, whereas MgO built up on the surface. Previous studies [24,38] also reported the external growth of MgO and the internal growth of CaO when dolomite was subjected to high-temperature calcination (>900 C). Furthermore, the surface molar ratio results using XPS indicated that the "similar" mixing characteristics for D-N8 and D-C7N8 were rather different.…”

Section: Characterization Of Sorbentsmentioning

confidence: 88%

Role of MgxCa1−xCO3 on the physical–chemical properties and cyclic CO2 capture performance of dolomite by two-step calcination

et al. 2015

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Section: Characterization Of Sorbentsmentioning

confidence: 88%

Role of MgxCa1−xCO3 on the physical–chemical properties and cyclic CO2 capture performance of dolomite by two-step calcination

et al. 2015

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“…The appearance of MgO on the surface of dolomite needles was suggested by Gallai et al [14] who studied the mechanism of dolomite's decomposition in CO 2 atmosphere.…”

Section: Non-isothermal Investigationsmentioning

confidence: 89%

“…There is no agreement between these studies concerning the kinetic model, the influence of CO 2 pressure, and the rate-controlling step [14].…”

Section: Introductionmentioning

confidence: 91%

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Thermal behavior of natural dolomite

Olszak-Humienik

Jabłoński

2014

J Therm Anal Calorim

128

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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 a \ 0.77 and by two-dimensional diffusion model D2 with ln(A) = 21.12 for a [ 0.77.

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“…These authors found a calcite phase with 20 mol% of magnesium at 900°C. Galai et al [23] studied the mechanism of growth of MgO and CaCO 3 during a dolomite partial decomposition. They found that at 680°C and under 0.025 atm, the reaction product is a solid solution Ca (1-x) Mg x (CO 3 ).…”

Section: Resultsmentioning

confidence: 99%