Estimation of ionic activities in chloride systems at ambient and elevated temperatures
1983; Elsevier BV; Volume: 11; Issue: 1 Linguagem: Inglês
10.1016/0304-386x(83)90013-0
ISSN1879-1158
Autores Tópico(s)Mine drainage and remediation techniques
ResumoThe study of non-oxidative dissolution of sulfide minerals in HCl solutions requires a thorough knowledge of the thermodynamic properties of the leaching medium. In particular, estimates of single-ion activities are necessary. This paper shows that a consistent set of data may be derived from reported experimental results for the pure components at 25°C. Estimated ion activities may be obtained from ionic hydration theory, extended to allow for a decreasing hydration number at low water activities. A relationship is derived for ionic activities in a mixture of a univalent and a bivalent salt with a common, unhydrated anion. Selected data are presented for HCl, NaCl, and MgCl2, as well as for mixtures of HCl with the two salts, at 25–100°C.
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