Abstract
The extraction of Fe(III) from phosphoric acid solutions of different concentration ranging from 0.4 up to 7.3 M by Cyanex 301 in toluene is presented. The numerical treatment of the experimental data by means of the Letagrop program has allowed to propose the extraction of a single complex of stoichiometry FeR3, HR being bis(2, 4, 4-trimethylpentyl) dithiophosphinic acid, for which the stoichiometric extraction constant values at each phosphoric acid concentration have been obtained. Taking into account the model of concentrated phosphoric acid proposed by Elmore, the activity coefficients of the aqueous species have been calculated and the stoichiometric equilibrium constant at each phosphoric acid concentration has been successfully correlated with the ionic strength. The value of the extraction constant at infinite dilution is also given (log K 0 30 = 8.55 ± 0.02).
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