Extraction of iron(III) from aqueous sulfate solutions by primene JMT

The results of the extraction of iron(III) sulfates with primary amine from neutral solutions as well as from solutions containing sulfuric acid are presented. Primene JMT in benzene with octan-1-ol as a modifier of solubility was used as the extractant. The presumed stoichiometry of extraction formulated on the basis of existing literature was compared with calculations for aqueous phase equilibrium compositions and with experimental results for sulfuric acid and iron(III) sulfate extraction. The presumption of extraction of a neutral complex Fe-2(OH)(2)(SO4)(2) from aqueous phase explains quite well the results of extraction from neutral and moderate acidic solutions. The results of extraction at higher concentrations of sulfuric acid in aqueous phase show that the complexes in organic phase could be more complicated.