Solid Phase Reaction between Calcium Carbonate and Silica

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  • CaCO<sub>3</sub>とSiO<sub>2</sub>の固体反応
  • CaCO3 ト SiO2 ノ コタイ ハンノウ

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Abstract

In order to build up a background to the relative difficulty for burning the different raw materials in cement production the solid phase reactions between SiO2 and either CaCO3 or BaCO3 at the temperatures ranging 500°-800°C were studied by measuring the amount of CO2 liberated during the reaction. Then, applying the figures so obtained into the Jander's equation for solid phase reaction the authors have tried to work out the rate constants as well as the activation energies. However, it was found out that there were many examples which failed to fit in the equation, probably, due to the additional CO2 liberated by simple thermal dissociation of the carbonates.<br>On the other hand, W. E. S. Turner et al. have suggested the acceleration of thermal dissociation of CaCO3 when it was mixed with the powder of silica or of pure gold. The same trend was confirmed to exist also in the case of BaCO3.<br>Furthermore, the investigation of X-ray diffraction pattern has revealed that the reaction products of CaCO3 and SiO2 obtained by heating at 700°C in air for 242 hours was not wollastonite (βCaO⋅SiO2) but larnite (β2CaO⋅SiO2).

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