Abstract
This work reports the results about the determination of mean activity coefficients and relative partial molar free energies for copper sulfide mineral bioleaching solutions by potentiometric method at 25 °C. The experimental potentiometric data were obtained by combining a diamond film—cupric ion-selective electrode (Cu(II) ISE), containing a KNO 3 filling solution, and an Ag/AgCl electrode. The measurements were performed, at constant ionic strength, in different series of copper sulfide mineral bioleaching solutions. The non-ideal behavior of the system was described on the base of the Pitzer ion-interaction model for mixed salts. Meanwhile, the relative partial molar free energies of bioleaching solution were obtained. The determination of the thermodynamic properties offers a basic data for the study of copper sulfide mineral bioleaching solutions.
Published Version
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