Ion interaction model applied to the cupric sulfate-sulfuric acid-water system at 25.degree.C
| Autor: | E. J. Reardon, C. F. Baes, Bruce A. Moyer |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry. 97:12343-12348 |
| ISSN: | 1541-5740 0022-3654 |
| DOI: | 10.1021/j100149a040 |
| Popis: | The modeling of aqueous mixtures of a bivalent metal sulfate and sulfuric acid according to the treatment of Pitzer is complicated by the formation of bisulfate ion and by the need to include the effects of unsymmetrical mixing of ions of like but unequal charge. Because of the economic importance of the recovery of copper by the leaching of its ores with sulfuric acid, it is especially important to improve estimates of Pitzer parameters for the CuSO[sub 4]-H[sub 2]SO[sub 4]-H[sub 2]O system. Accordingly, we have applied the Pitzer treatment to available osmotic, solubility, and emf data for this system, with inclusion of unsymmetrical mixing effects. We employed published parameters for the H[sub 2]SO[sub 4]-H[sub 2]O system and evaluated literature data to obtain parameters for the CuSO[sub 4]-H[sub 2]O system. The best fits to the data for mixtures were given by parameters sets that, in addition to [beta]+(0)[Cu[sup 2+]-HSO[sub 4][sup [minus]]] and [beta]+(1)[Cu[sup 2+]-HSO[sub 4][sup [minus]]], included at least one other parameter. The best choice of one was [psi][Cu[sup 2+]-H[sup +]-HSO[sub 4][sup [minus]]], and the best choice of two additional parameters was [theta][Cu[sup 2+]-H[sup +]] and [psi][Cu[sup 2+]-H[sup +]-HSO[sub 4][sup [minus]]]. The resulting mean activity coefficient ([gamma]-[+-]) of CuSO[sub 4] atmore » trace concentrations shows a dependence on sulfuric acid concentration quite similar to that found previously for FeSO[sub 4] and for NiSO[sub 4]. 25 refs., 5 figs., 6 tabs.« less |
| Databáze: | OpenAIRE |
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