METHOD FOR PRODUCING CALCIUM CARBONATE

摘要

PROBLEM TO BE SOLVED: To obtain an aragonite type calcium carbonate having a needle shape or a burr-like shape which can provide a useful performance as a filler and a coating pigment for papermaking by utilizing a caustification process. SOLUTION: Milk of lime is prepared in a caustification tank having 0.15-0.7 of d/D value which represents ratio of the blade diameter of the stirrer to the diameter of the caustification tank, and under a stirring condition of 0.1 kw/m<3> or more of P/V value which represents the stirring power provided per a unit volume of the milk of lime during the preparation of the milk of lime. And then, a caustification rection is carried out under a given addition rate of the green solution and temperature while stirring the stirrer with the stirring power of 0.1 kw/m<3> or more of P/V value during the reaction.