Separation of zinc and cadmium ions from sulfate solutions by ion flotation and transport through liquid membranes
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Technical University of Częstochowa
Wrocław University of Technology
Małgorzata Ulewicz   

Department of Chemistry, Technical University of Częstochowa, 42-200 Częstochowa, Armii Krajowej 19 Street, Poland
Władysław Walkowiak   

Institute of Inorganic Chemistry and Metallurgy of Rare Elements, University of Technology, 50-370 Wrocław, Wybrzeże Wyspiańskiego 27
Publication date: 2003-01-01
Physicochem. Probl. Miner. Process. 2003;37(1):77–86
An experimental investigation is presented on zinc(II) and cadmium(II) ions separation from aqueous sulfate solutions, containing equimolar mixture on both metal ions, by ion flotation (IF) and transport through polymer inclusion membrane (PIM) processes. The IF experiments from dilute aqueous solutions (cMe = 1·10-5 M) with an anionic surfactant (sodium dodecylbenzene sulfonate) and a cationic surfactant (hexadecylpyridinium chloride) are shown. With a cationic surfactant, the flotation separation of Cd/Zn grows with SO42- concentration increase. In addition, the selective transport of Zn(II) and Cd(II) from aqueous sulfates source phase (cMe = 1·10-2 M) through PIM containing cellulose triacetate (support), o-nitrophenyl pentyl ether (plasticizer) and di(2- ethylheksyl)phosphoric acid D2EHPA (ion carrier) is shown. The transport selectivity of Zn/Cd decreases with Na2SO4 concentration increase in source phase. Results obtained are discussed in terms of the stability constants of sulfate complex species for zinc(II) and cadmium(II).