Abstract
Homogeneous (unseeded) precipitation of calcium and magnesium carbonates in the CaO–MgO–CO 2–H 2O system in supersaturated solutions was investigated. The induction period ( τ) of spontaneous nucleation and the composition of precipitated solid phases were determined. The influence of saturation degree (chemical affinity) and Mg 2+/Ca 2+ activity ratio in solution on the kinetics of CaCO 3 nucleation was studied. The order of CaCO 3 homogeneous nucleation equals to 4. The surface energy of CaCO 3 nucleus was measured to be 63 mJ/m 2. The main factor which controls the Mg content in the solid phase being formed during unseeded precipitation of carbonates is the saturation index of MgCO 3 in solution.
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