Crystallization Kinetics of Calcium Carbonate at a Stoichiometric Ratio of Componentsстатья
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Дата последнего поиска статьи во внешних источниках: 16 ноября 2017 г.
Аннотация:Formal kinetics of calcium carbonate crystallization in aqueous solution at a stoichiometric ratio of Ca2+ and CO32- ions was studied. The control of the kinetics of the process was carried out by convenient and reliable methods (complexometric determination of calcium in the liquid phase and determination the size of the solid particles by energy-microscopic methods). The influence of the supersaturation degree and temperature on the induction and crystallization periods and the equilibrium concentration of calcium ions in the solution under constantly controlled pH and ionic strength had been estimated. The kinetics parameters (n, k, τ1/2, Ea) of crystallization of calcium carbonate were calculated. It is shown that the stoichiometric ratio of the components determines the morphology, crystallinity and dispersibility of calcium carbonate, and the change in temperature (25-45 °C) and the supersaturation degree of the solution (2-6) in this range do not affect to the characteristics of the solid phase. The precipitated pattern of calcium carbonate has the structure of calcite.