The gelatinous matter obtained by the reaction between a high concentration CaCl
2 aqueous solution and ammonia alkaline (NH
4)
2CO
3 aqueous solution at temperature range 0°C-30°C were studied by X-ray diffraction, DTA, electron microscope, specific surface area measurment and electrical conductivity of the reacting matter before and after the peptization.
X-ray diffraction patterns showed that μ-CaCO
3 is formed by peptization of gelatinous CaCO
3 and the presence of double salt of CaCO
3 is not found through the reaction. From the DTA and X-ray diffraction patterns, dry gelatinous CaCO
3 transformed directly to calcite without the formation of μ-CaCO
3. The specific surface area of gelatinous CaCO
3 and μ-CaCO
3 were about 40m
2/g and 6-10m
2/g respectively. By the measurements of Cl
- concentration in reacting mixture and electrical conductivity, it was supposed that the gelatinous CaCO
3 will confine some quantity of water in reacting mixture.
抄録全体を表示