We have conducted solvent extraction experiments of FeCl 3 in HCl solution with Alamine336 as an extractant. Solvent extraction reaction depended on the ratio of initial concentration of Alamine336 to FeCl 3 . When the concentration of Alamine336 was in excess to that of FeCl 3 , the extractant reacted as a dimer. When the initial concentration ratio of Alamine336 to FeCl 3 was below three, ferric chloride was extracted by monomeric extractant. The equilibrium constants of solvent extraction were determined by applying ionic equilibria to the experimental data. These ionic equilibria consisted of chemical equilibria, mass and charge balance equations. The activity coefficients of solutes in aqueous phase were calculated by using Bromley equation. The predicted distribution coefficients of iron agreed well with those measured.
In order to simulate the leaching of zinc calcine by sulfuric acid solutions, we prepared synthetic solutions with the composition ZnSO 4 -Fe 2 (SO 4 ) 3 -Na 2 SO 4 -H 2 SO 4 -NaOH-H 2 O and measured the solution pH at various temperatures. The effect of temperature on the ionic equilibria of these solutions was analyzed by considering chemical equilibria, mass balance and charge balance equations. The activity coefficients of solutes and the activity of water were calculated by using the Pitzer equation. The mole fractions of iron species were greatly affected by the solution temperature and the concentration of Fe 2 (SO 4 ) 3 . In the experimental ranges of ionic strength of solution up to 9 m, the pH values calculated in this study agreed well with those measured.
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