Precipitation of calcium carbonate

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The precipitation of CaCO3, formed by mixing equimolar solutions of Na2CO3 and CaCl2 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 Mg2+, Mn2+, Br- and NO-3 as trace impurities. The numbers of crystals formed in supersaturated solutions were determined for pure and Mn2+ contaminated systems and the crystal-solution interfacial tensions were calculated. Desupersaturation curves of slightly supersaturated solutions of CaCO3 were followed conductometrically and the data were used to estimate growth rates of CaCO3 crystals, taking into account the change of total external crystal surface area with time. The influences of Mg2+, Mn2+, Cr3+ and F- on the growth kinetics and the modification of crystal habit were determined. © 1982.




Söhnel, O., & Mullin, J. W. (1982). Precipitation of calcium carbonate. Journal of Crystal Growth, 60(2), 239–250.

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