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    Recovery and concentration of metals from red mud by Donnan dialysis
    (ELSEVIER SCIENCE BV, 2003) Cengeloglu, Y; Kir, E; Ersoz, M; Buyukerkek, T; Gezgin, S
    The transport fluxes of Al(III), Fe(III), Ti(IV) and Na(I) ions from red mud through charged heterogeneous and Neosepta CMB and CMX cation exchange membranes has been studied as a function of H+ ion concentration in stripping phase. In this process, the feed solutions is initially red mud aqueous solution or half-diluted solution which contains Al(III), Fe(III), Ti(IV) and Na(I) ions and other side is HCl solutions at different concentrations (0.05, 1.0 M). It was shown that the fluxes and recovery factor value of metal ions were enhanced with increasing concentration in feed phase and H+ ion concentration in stripping phase. (C) 2003 Elsevier B.V. All rights reserved.
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    Simultaneous recovery of Cr(III) and Cr(VI) from the aqueous phase with ion-exchange membranes
    (ELSEVIER SCIENCE BV, 2005) Tor, A; Buyukerkek, T; Cengeloglu, Y; Ersoz, M
    The simultaneous recovery of trivalent and tetravalent chromium ions through charged ion-exchange membranes by using three detachable cells was tested at different current densities. The effect of mono- and divalent valence ions corresponding to trivalent and hexavalent chromium ions in the feed phase was investigated. The recovery factor values of chromium (III) and (VI) ion without current density were obtained and found that it was higher in the absence of binary monovalent and divalent ions, but increased with increasing current density and decreased in the presence of the binary mono- and divalent ions. The transport of both oxidation states of chromium ions through membranes was also correlated with the flux data.