Abstract
The synthesis of low-Mg calcites of composition between 0.5 and 3 mole% magnesium carbonate is described. The crystals were prepared by seeding dilute mixed solutions of Ca- and Mg-bicarbonate with concentrations encompassing the range occurring in natural hard-water systems, i.e. Mg/Ca ratio between 0.15 and 1.0. The Ca ion activity and Mg concentration were kept constant during the preparation by an automatic procedure. The solid products were analysed using SEM, XRD and atomic absorption. The results of the calculation of the equilibrium distribution coefficients were interpreted using regular solution theory and compared with published results from similar systems. The application of the theory to the results permitted estimates of the interchange energy for the solid solution and changes in the distribution coefficient with solution composition.
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