Limestone Calcination Nearby Equilibrium: Kinetics, CaO Crystal Structure, Sintering and Reactivity
By J. Valverde, P. Sánchez-Jiménez, L. Pérez-Maqueda. 2015
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In this work, we analyze limestone calcination kinetics at environmental conditions involving a CO2 partial pressure P close to the equilibrium pressure Peq by means of in situ X-ray diffraction (XRD) and thermogravimetric (TG) analyses. In contrast with previous empirical observations carried out mostly at conditions far from equilibrium (P/Peq ≪ 1), our results show that the decarbonation rate decreases as the temperature in increased while P/Peq is kept constant, which is explained from a reaction mechanism including desorption of CO2 and the exothermic structural transformation from metastable CaO* nanocrystals to the stable CaO form. The crystal structure and sintering of nascent CaO during calcination has been investigated from in situ XRD analysis, physisorption analysis, and scanning electron microscopy (SEM), which shows that the ratio of the size of polycrystalline CaO grains to crystallite size increases linearly with the CO2 partial pressure in the calcination atmosphere. For high CO2 partial ...
Subfields: Biomedical Engineering, Geochemistry and Petrology, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/b516b3e95e4460551a7fe1528ea601d197623bc5
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Citations in the corpus
- Multicycle activity of natural CaCO3 minerals for thermochemical energy storage in Concentrated Solar Power plants (2017, background): “9) is consistent with the loss of surface area 357 and pore volume as previously reported for limestone samples subjected to prolonged 358 calcination at diverse conditions of temperature and CO2 concentration in the calciner 359 environment (Valverde et al., 2015).”