Abstract
The precipitation of CaCO 3, formed by mixing equimolar solutions of Na 2CO 3 and CaCl 2 at different dilutions in aqueous solution, has been studied at 25°C. Induction periods were determined as functions of the initial supersaturation by different methods (visually, turbidimetrically and conductometrically) for the “pure” system and in the presence of Mg 2+, Mn 2+, Br - and NO - 3 as trace impurities. The numbers of crystals formed in supersaturated solutions were determined for pure and Mn 2+ contaminated systems and the crystal-solution interfacial tensions were calculated. Desupersaturation curves of slightly supersaturated solutions of CaCO 3 were followed conductometrically and the data were used to estimate growth rates of CaCO 3 crystals, taking into account the change of total external crystal surface area with time. The influences of Mg 2+, Mn 2+, Cr 3+ and F - on the growth kinetics and the modification of crystal habit were determined.
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