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

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.