Crystallization experiments with calcium carbonate by three liquid-liquid reaction systems from a MSMPR crystallizer were conducted to makeclear the characteristics of reactive crystallization kinetics. As it was confirmed that the crystal growth obeys the ALlaw from the CSDobtained, the nucleation rate and growth rate wereobtained. The effects of the operating factors and the reaction systems on the crystallization kinetics were studied. It was clarified that the nucleation rate and the growth rate are correlated by the power law model, and that the kinetic orders in the power law model are correlated with carbonate alkah'nity irrespective of reaction system.

Crystallization of calcium carbonate by gas-liquid and liquid-liquid reactions in a continuous MSMPR crystallizer was conducted over a wide range of suspension densities. The effects of operating factors and reaction mechanism o n the cyrstallization kinetics were investigated.The crystallization kinetics for both reaction systems are correlated by the power law model and these correlations depend on the suspension density regions. The kinetic orders in the power law model are correlated with carbonate alkalinity irrespective of the reaction mechanism and the suspension density.On a effectue la cristallisation de carbonate de calcium par des reactions gaz-liquide et liquide-liquide dans un cristalliseur MSMPR continu pour une large gamme de densites de suspensions. Les effets des facteurs de fonctionnement et du mecanisme de reaction sur les cinktiques de cristallisation ont ete ttudies.Les cinktiques de cristallisation pour les deux systtnies de reaction sont corrilies par le modele de loi de puissance et ces corrdations dependent des regions de densite de suspensions. Les ordres de cinktique dans le modele de loi de puissance sont corrtlts avec I'alcaliniti. du carbonate sans tenir compte du mecanisme de reaction et de la densite de suspensions.

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