CaCO3とSiO2の固体反応

柿谷 悟, 藤坂 正良

doi:10.2109/jcersj1950.66.750_133

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. 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. 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).

CaCO<sub>3</sub>とSiO<sub>2</sub>の固体反応

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