| Abstract |
| To simulate the sulfuric acid leaching solutions of zinc calcine, synthetic solutions with the composition of ZnSO_4-Fe_2(SO_4)_3-Na_2SO_4-H_2SO_4-NaOH-H_2O were prepared and solution pH was measured at the temperature of 25, 50 and 75℃. The effect of temperature on the ionic equilibria of these solutions was analyzed by considering chemical equilibria, mass balance and charge balance equations. Activity coefficients of solutes and activity of water were calculated by using Pitzer equation. The mole fractions of iron containing species were greatly affected by solution temperature and the concentration of Fe_2(SO_4)_3. In the experimental ranges of ionic strength of solution up to 9m, the pH values calculated in this study were in good agreement with those measured. |
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| Key Words |
| Zinc calcine, Leaching, Sulfuric acid, Ionic equilibria, Pitzer, Temperature |
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