The effect of calcium hydroxide (Ca(OH) 2 ) on the stability of calcium carbonate (CaCO 3 ) particles was investigated with respect to the surface potential and particle size. Both CaCO 3 and Ca(OH) 2 were dissolved in ultrapure water at concentrations up to 100 mM. The solubility limits were about 18 mM for Ca(OH) 2 and about 0.13 mM for CaCO 3 at 23°C in water. Dissolution of commercial CaCO 3 in 10 mM of Ca(OH) 2 solution and dissolution of Ca(OH) 2 in 10 mM of CaCO 3 slurry were also studied at similar conditions. Conductivity, pH, zeta potential, and average particle sizes were measured for each solution. The morphological characteristics of the particles were analyzed by the SEM images. It was found that the zeta potential of CaCO 3 particles was greater than +30 mV when they were placed in the Ca(OH) 2 solution compared to a zeta potential value of −10 mV in water. It was concluded that the Ca(OH) 2 solution is a stabilizer for the CaCO 3 particles.
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