Abstract
The extraction of copper from acidic medium using Liquid Emulsion Membrane LEM as contactors was studied. b diketone LIX 54 as an extractant ,sesqueoleate which is nonionic surfactant with HLB value 3.7 and 0.1 M H2SO4 as stripping solution were used. The influence of initial concentration of copper in the aqueous feed phase, pH of external and internal aqueous phase, stirring speed, and concentration of extractant on the extraction rate was examined. The results obtained showed that practically all the copper content was removed from the acidic feed solution. The recovery of copper attained 96–100% and concentration ratios of about 40-fold could be achieved.
Highlights
There is a general concern to minimize the discharge of hazardous metals in waste streams
Aqueous waste streams contaminated with heavy metal ions are frequently encountered from various industrial processes such as mining and smelting, metal plating, metal finishing during attempts to remediate soil loaded with heavy metals
Liquid Emulsion Membrane (LEM) first invented by Li [1] offers a promising technology for the separation of heavy metal ions from aqueous solution
Summary
There is a general concern to minimize the discharge of hazardous metals in waste streams. This technique is becoming unpopular because the products obtained are not always of required quality and the process produces a sludge that has to be disposed of in a landfill Solvent extraction is another widely used technique, but it requires large amount of organic solvent and metal extractant and becomes inefficient when the metal ion concentration in the waste stream is low. LEM removes the equilibrium limitation of solvent extraction by combining the extraction and stripping simultaneously in the same time thereby achieving reduction of metal concentration in the feed solution to a very low level. They reduce the amount of organic solvent and metal extractant substantially. Present an overall idea of the optimal operating conditions for copper extraction into LEMs [13,14,15]
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