Method for manufacturing monodisperse vaterite type calcium carbonate

A method for manufacturing particles of monodisperse spherical, ellipsoidal or plate-like vaterite type calcium carbonate wherein

• (a) 0.1 .mu.m.ltoreq.DS1.ltoreq.2.0 .mu.m
• (b) 0.04 .mu.m.ltoreq.DS2.ltoreq.2.0 .mu.m
• (c) 1.0.ltoreq.DS1/DS2.ltoreq.20
• (d) DP3/DS1.ltoreq.1.25
• (e) 1.0.ltoreq.DP2/DP4.ltoreq.2.5
• (f) 1.0.ltoreq.DP1/DP5.ltoreq.4.0, and
• (g) (DP2-DP4)/DP3.ltoreq.1.0
• where:
• DS1 is the mean particle size in .mu.m of the major axis of the particles,
• DS2 is the mean particle size in .mu.m of the minor axis of the particles,
• DP1 is the mean particle size in .mu.m for the 10 weight % of the particles having the largest particle size,
• DP2 is the mean particle size in .mu.m for the 25 weight % of the particles having the largest particle size,
• DP3 is the mean particle size in .mu.m for the 50 weight % of the particles having the largest particle size,
• DP4 is the mean particle size in .mu.m for the 75 weight % of the particles having the largest particle size side, and
• DP5 is the mean particle size in .mu.m for the 90% weight % of the particles having the largest particle size, which comprises adding 5-20 mol equivalents of water, calculated per mol equivalent of unslaked lime, to a suspension containing 0.5-12 weight % of unslaked lime and/or slaked lime suspended in methanol, passing carbon dioxide gas through the suspension and maintaining the temperature of the suspension at not less than 30.degree. C. until the conductivity of the suspension reaches its maximum value while passing the carbon dioxide gas through the suspension at a rate such that the conductivity of the suspension reaches 100 .mu.S/cm in less than 1,000 minutes.