Abstract
The solubility and stability of several organophosphoric acid extractants is investigated in light of the selection of suitable extractants for iron(III) solvent extraction as a potential iron rejection route in zinc processing. Specifically, the effects were studied of acid medium (HCl and H 2SO 4), metal-salt presence (Fe 2(SO 4) 3 and FeCl 2,3), and temperature (20 and 50 °C) on extractant solubility and degradation. Aqueous entrainment was not considered. Tests were performed on three organophosphoric acid extractant candidates: OPAP (equimolar mixture of mono- and di-octylphenyl acid phosphates); D2EHPA (di-(2-ethylhexyl) phosphoric acid); and M2EHPA (mono-2-ethylhexyl phosphoric acid). With regard to simple H 2SO 4 and HCl acid solutions, the order of solubility and degradation followed was M2EHPA≫OPAP>D2EHPA. The presence of metal-salts reversed the observed order of degradation, H 2SO 4(aq)>HCl (aq), increasing degradation in the latter medium. To explain the degradation behaviour in HCl strip medium, a mechanism that considers iron(III) metal-catalyzed ester hydrolysis is postulated.
Published Version
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