Abstract
The solubility of calcium sulfate dihydrate (CaSO 4·2H 2O) and calcium hydroxide (Ca(OH) 2) in alkali solutions is essential to understand their desilication behavior from Bayer liquor. In this work, solubilities of calcium sulfate dihydrate and calcium hydroxide for the ternary systems of CaSO 4·2H 2O–NaOH–H 2O, CaSO 4·2H 2O–KOH–H 2O, and Ca(OH) 2–NaOH–H 2O were measured by using the classic isothermal dissolution method over the temperature range of 25–75 °C. The Pitzer model embedded in Aspen Plus platform was used to model the experimental solubility data for these systems. The experimental solubility data was employed to obtain the new binary interaction parameters for Ca(OH) +–OH −, Ca(OH) +–Ca 2+ and Ca(OH) +–K +, suggesting that the species Ca(OH) + is a dominant species in simulated solubility for alkali systems. Validation of the parameters was performed by predicting the solubility for the ternary systems of Ca(OH) 2–NaOH–H 2O, CaSO 4·2H 2O–NaOH–H 2O and CaSO 4·2H 2O–KOH–H 2O with the overall average relatively deviation (ARD) of 2.12%, 0.75% and 1.63%, respectively.
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