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过程工程学报 2012
Solubility Measurement of Calcium Sulfate Dihydrate in NH4Cl-（NH4）2SO4 Solutions and Thermodynamic Calculation
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Abstract:
The solubility of CaSO4·2H2O in the solution of NH4Cl and mixed solution of NH4Cl-(NH4)2SO4 was studied using dissolution method in a temperature range from 298.15 to 343.15 K.The results showed that in the two solutions the solubility of CaSO4·2H2O increased with increasing of NH4Cl concentration,but the temperature had little effect.In addition,a mixed electrolyte NRTL model was employed to calculate the solubility of CaSO4·2H2O in different concentrations of NH4Cl at various temperatures.New model parameters for electrolyte NRTL model were obtained via regression of experimental data.The calculated solubility was in good agreement with experimental values with the relative average deviation of 2.36%.
