Monodisperse calcium carbonate from the vaterite, a method for the preparation of the same and method for the control of particle growth and the particle shape.

摘要

PURPOSE:To obtain a spherical or elliptic vaterite calcium carbonate having high dispersibility and containing little secondary aggregate by introducing carbon dioxide gas into a methanol suspension containing a specific amount of quick lime and/or staked lime and a specific amount of water and carrying out the carbonation reaction under specific condition. CONSTITUTION:A mixture of methanol, quick lime and/or slaked lime and water is produced by adding water to a methanol suspension of quick lime and/or slaked lime having a concentration of 0.5-12wt.% (in terms of quick lime). The amount of water is 5-20mol per 1mol of the quick lime (in the case of using slaked lime, the amount is reduced to the same molar amount of quick lime). Carbon dioxide gas is introduced into the mixture and carbonation reaction is carried out while adjusting the system temperature to =30 deg.C before the electrical conductivity of the carbonation reaction system reaches the peak in the electrical conductivity curve of the reaction system and adjusting the time from the start of the carbonation reaction to the time to attain a conductivity of 100muS/cm to be shorter than 120min.