size was determined by a sedimentation technique using a micromeritics sedigraph model 5100 on an aqueous dispersion of the product at about 3 and using about 0 1 carboxylated polyelectrolyte daxad 30 as a dispersant in paper making processes employing the method of the present invention a high solids pcc cake which contains smaller average size pcc particles may be effectively dewatered during the air blow cycle the process for producing the aragonitic pcc composition of the present invention involves the reaction of calcium hydroxide with carbon dioxide 1 nominal 30 liter vessel with flat turbine style agitator blades 2 and jacketed for heating cooling 1 prepare a milk of lime of ca oh 2 by adding 10 parts water to 1 part cao under agitation with initial water temperature adjusted to at least about 40 deg c lime amount is 2000 grams and water amount is 20 liters note the resulting milk of lime slake will be at u02dc 11 weight percent solids of ca oh 2 slurry total amount of slake is u02dc 3200 grams as caco 3 2 screen milk of lime so that it is free of 60 mesh grit place slake in 30 liter reactor 3 adjust milk of lime temperature to 50 deg c 4 add 160 grams of m 60 aragonite to milk of lime allow to mix for 15 minutes.