Regularities of iron (III) extraction in systems Salting-out agent – potassium bis(alkylpolyoxyethylene)phosphate – water

Abstract

The regularities of iron (III) distribution in the ammonium sulfate – oxyphos B – water system in the presence of inorganic acids and an additional salting-out agent – sodium chloride have been studied. It has been estab-lished that at low acidity, iron (III) is extracted by the cation-exchange mechanism, and in the presence of chloride ions, iron can be extracted from acidic media by the hydrate-solvate mechanism. It has been established that at acidity above 3.5 mol/l HCl, iron (III) is extracted by the hydrate-solvate mechanism in the form of the compound H2[FeCl5]. It has been proven that in the simultaneous presence of sulfuric acid and sodium chloride, iron (III) extraction occurs simulta-neously by the cation-exchange and hydrate-solvate mechanisms.