Liquid-Liquid Extraction of Zinc from Synthetic Sulphate Solution by Chloride Ion without Using Organic Solvent

Document Type : Research Article


Department of Mining Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, I.R. IRAN


In this research, the capability of PEG/salt aqueous biphasicsystems were investigated for the extraction of zinc without addition of any extractant. For this purpose, chloride ion as an inorganic extractant used to extract zinc from synthetic zinc solution. The effect of several experimental parameters such as concentration of chloride, PEG, Na2SO4, and pH of salt-rich phase for extraction of zinc(II) were studied. Finally, the existing chloride ion in PEG/sodium sulphatesalt solution, under optimum conditions of pH=1.5, concentration of chloride ion=1 mol/L, PEG1500=50%, (weight percent in solution) sodium sulphate=15%, initial weight of zinc=3.4 mg, the extent of 80% of zinc was extracted and transferred from salt-rich phase into the PEG phase.


Main Subjects

1] Zhang, T. Li, W. Zhou,W. Gao, H. Wu, J. Xu, G. Chen, J. Liu, H. Chen, J., Extraction and Separation of Gold (I)/ Cyanide in Polyethylene Glycol-Based Aqueous Biphasic Systems, Hydrometallurgy, 62, p. 41 (2001).
[2] Mageste A.B., Lemos L.R.D., Aqueous Two-Phase Systems: An Efficient, Environmentally Safe and Economically Viable Method for Purification of Natural Dye Carmine, Journal of Chromatography A., 1216(45), p. 7623 (2009).
[3] Pai S.A., Lohithakshan K.V., Mithapara P.D., Aggarwa S.K., Use of Polyethylene Glycol (PEG) Based Aqueous Biphasic System (ABS) for the Extraction of Pu(IV), Pu(VI) and Am(III) with 18- Crown-6 : A Thermodynamic Study, Journal of Radioanalytical and Nuclear Chemistry, 245(3), p. 619 (2000).
[4] Huddleston J., Willauer H.D., Griffin S.T., Rogers R.D., Aqueous Polymeric Solutions as Environmentally Benign Liquid/ Liquid Extraction Media, Ind. Eng. Chem. Res., 38, p. 2523 (1999).
[5] Liu X., Gaob Y., Tang R., Wang W., On the Extraction and Separation of Iodide Complex of Cadmium(II) in Propyl-Alcohol Ammonium Sulfate Aqueous Biphasic System, Separation and Purification Technology, 50, p. 263 (2006).
[6] Osseo-Asare K., Zeng X., Partition of Pyrite in Aqueous Biphase Systems, Int. J. Miner. Process., 58, p. 319 (2000).
[7] Rozen A.M., Safiulina K., Shkinev V.M., Problems of Phase Formation in the Polyethylene Glycol Inorganic Salt Water Systems at Metal Extraction: I. Selected Anions Inducing Phase Separation. Radiochemistry, 43(6), p. 558. Translated from Radiokhimiya, 43(6), p. 490 (2001).
[8] Bulgariu L., Bulgariu D., The Extraction of Zn(II) in Aqueous PEG (1550) - (NH4)2SO4 Two-Phase system Using Cl Ions as Extracting Agent, J. Serb. Chem. Soc., 72 (3), p. 289 (2007).
[9] Bulgariu L., Bulgariu D., Extraction of Metal Ions in Aqueous Polyethylene Glycol-Inorganic Salt Two-Phase Systems in the Presence of Inorganic Extractants: Correlation between Extraction Behaviour and Stability Constants of Extracted Species, Journal of Chromatography A, 1196–1197, p. 117 (2008).
[10] Zvarova T.A., Shkinev V.M., Vorob'eva G.A., Spivakov B.Y., Zolotov D.Y.A., Liquid-Liquid Extraction in the Absence of Usual Organic Solvents: Application of Two-Phase Aqueous Systems Based on a Water-Soluble Polymer, Mikrochimica Acta [Wien] III, p. 449 (1984).
[11] Rodrigues G.D., Silva M., Silva L., Paggioli F.G., Minim L.A., Coimbra J., Liquid-Liquid Extraction of Metal Ions without Use of Organic Solvent, Separation and Purification Technology, 62, p. 687 (2008).
[12] Bulgariu L., Bulgariu D., The Partition Behavior of Zn(II) using Halide Ions Extractants in Aqueous Peg-Based Two-Phase Systems, Separation Science and Technology, 42, p. 1093 (2007).
[13] Bulgariu L., Bulgariu D., Cd(II) extraction in PEG (1500)- (NH4)2SO4 Aqueous Two- Phase Systems Using Halide Extractants, J. Serb. Chem. Soc., 73 (3), p. 341 (2008).
[14] Ananthapadmanabhan K.P., Goddard E.D., "Aqueous Biphase Formation in Polyethylene Oxide-Inorganic Salt Systems", Research and Development Department, Specialty Chemicals Division, Union Carbide Corporation, Tarrytown, New York 10591, (1986).
[15] Rogers R.D., Bond A.H., Bauer C.B., Zhang G., Griffin S.T., Metal Ion Separation in Polyethylene Glycol-Based Aqueous Biphasic System: Correlation of Partitioning Behavior with Available Thermodynamic Hydration Data, Journal of Chromatography B, 680, p. 221 (1996).
[16] Rogers R.D., Griffin S.T., Partitioning of Mercury in Aqueous Biphasic Systems and on ABEC Resins, Journal of Chromatography B, 711, p. 277 (1998).
[17] Shibukawa M., Nakayama N., Hayashi T., Shibuya D., Endo Y., Kawamura S., Extraction Behaviour of Metal Ions in Aqueous Polyethylene Glycol-Sodium Sulphate Two-Phase Systems in the Presence of Iodide and Thiocyanate Ions, Analytica Chimica Acta, 427, p. 293 (2001).
[18] Safiulina A.M., Tananaev I.G., Extraction of U(VI) with Poly(Ethylene Glycol) in Two-Phase Aqueous Systems Containing Various Anions, Radiochemistry, 46(5), p. 457. Translated from Radiokhimiya, 46(5), p. 423 (2004).
[19] Zeng X., Osseo-Asare K., Partitioning Behavior of Silica in the PEG/dextran/H2O Aqueous Biphasic System, Colloids and Surfaces A, Physicochem. Eng. Aspects, 226, p. 45 (2003).
[20] Griffin S.T., Spear S.K., Rogers R.D., Effects of Speciation on Partitioning of Iodine in Aqueous Biphasic Systems and Onto ABEC Resins, Journal of Chromatography B, 807, p. 151 (2004).
[21] Shibukawa M., Minamisawa H., Saitoh K., Shiozawa H., Komine K., Shimizu S., Selective Separation of Metal Ions by Aqueous Polyethylene Glycol-Sodium Sulfate Biphasic Extraction with Thiocyanate Ion and Some Masking Agents, Japanese Article, 38 (2) (2005).
[22] Bulgariu L., Bulgariu D., Sarghie1 I., Malutan T., Cd(II) Extraction in PEG based Two-Phase Aqueous Systems in the Presence of Iodide Ions. Analysis of PEG-rich Solid Phases, CEJC, 5(1), p. 291 (2007).
[23] Smolik M., Jakobik-Kolon A., Poraski M., Extraction of Zirconium and Hafnium in Polyethylene Glycol-Based Aqueous Biphasic System, Separation Science and Technology, 42, p. 1831 (2007).
[24] Roy K., Lahiri S., Extraction of Hg(I), Hg(II) and Methylmercury Using Polyethylene Glycol Based Aqueous Biphasic System, Applied Radiation and Isotpes,67 (10) p. 1781 (2009).