Crystallization of CaC03 accompanying chemical absorption of C02 as a single gas and as a mixture with S02 into aqueous solutions of Ca(OH)2 was studied in a stirred vessel with a flat gas-liquid interface. The nucleation and growth rates determined by CSD analysis of crystals formed in a MSMPR crystallizer were related to several operating conditions. The type and shape of the crystals varied with the concentration of Ca(OH)2, but their mean size was only slightly influenced by the concentration of Ca(OH)2 and by the mean residence time of suspension. The presence of S02 considerably reduced the growth rate of CaC03 crystals under the conditions of a slight decrease in the rate of C02 absorption.

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