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Extraction of iron(III) by binary extractants based on quaternary ammonium bases and organic acids

Iron extraction from chloride and sulfate solutions by binary extractants of various composition has been studied. Quaternary ammonium base (QAB) caprylates or dialkylphosphates extract iron in the form of either (R A N)FeCl 4 or an iron salt of organic acids depending on the hydrogen ion concentration of the aqueous solution. From sulfate solutions at pH > 3, QAB caprylate extracts an iron(III) ion the form of Fe 3 A 9 . It has been shown that nickel and cobalt sulfate electrolytes can be freed from iron using binary extractants and that iron can be stripped from the organic phase using sulfuric acid solutions.