Selective Metal-Ion Extraction for Multiple-Ion Liquid-Liquid Exchange Reactions. Final Report, June 1, 1979-May 31, 1982

摘要

This research in hydrometallurgical solvent extraction is to develop a fundamental means to predict selectivity during simultaneous solvent extraction of multiple metal ions when the kinetic rates and thermodynamic equilibria both do not favor the desired metal. To this end the chemical kinetics and thermodynamic chemical equilibria models for the system copper-iron-acid sulfate solutions extracted by beta -alkenyl-8-hydroxy quinoline in xylene are studied. These models can be employed with appropriate design equations to predict selectivity factors for two phase contactors. The work completed and in progress during the first half of the third funding period is on chemical equilibria studies for the iron-acid-sulfate- beta -alkenyl-8-hydroxy quinoline-xylene system. An aqueous phase ionic equilibrium model is available which can be used to calculate concentration of various Fe(III) ionic species present. Iron extraction data were obtained using both the AKUFVE, a high intensity stirrer with an in line centrifugal separator, and a shaker bath apparatus. Analysis of the data to determine a thermodynamic equilibrium model is in progress.