Abstract
Solubility and physicochemical properties (viscosity, density, and pH value) of calcium carbonate in ammonium chloride aqueous solution at (298.15, 323.15, and 348.15) K were investigated by using isothermal dissolution method. The solubility of calcium carbonate is 0.1521 mmol·kg–1 in water, but the solubility up to 10.5899 mmol·kg–1 when the molality of ammonium chloride aqueous solution is 1.5946 mol·kg–1 at 323.15 K, and the solubility increases with an increase on temperature and on molality of ammonium chloride. The reason for this result is interpreted by hydrolysis theory that hydrolysis of ammonium cause pH to decrease. The behavior about physicochemical properties is also analyzed, and the viscosity of the solution was predicted by the exponential model and extended Jones–Dole model. The solubility and physicochemical properties in this work is basically required for studying of calcium carbonate, which would provide a basis to optimize the process of calcium carbonate in the industrial production.
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