Abstract
The extraction of palladium from hydrochloric acid solutions into emulsion liquid membranes (ELMs) using LIX 984N-C as the extractant was investigated. The influential factors and the total capacities of palladium extraction were determined by a batch method. The behavior of palladium extraction by ELMs under the operational conditions-pH of the external feed phase, surfactant and extractant concentration, internal stripping phase concentration, treat ratio and agitation speed were reported. Using LIX 984N-C, palladium was effectively extracted from the external acidic chloride feed phase into the internal receiving phase of W/O emulsions. More than 92% of palladium could be extracted at a feed pH of 2 with 3% Span 80, 9% LIX 984N-C and 7M HCl at a stirring speed of 300 rpm.
Highlights
Much attention has been paid on the development of an efficient treating process for industrial wastes because they have a probability of destroying the global environment [1,2]
Palladium extraction into Emulsion liquid membranes (ELMs) is represented by Ce/Ce0 as a function of time, where Ce is the instantaneous concentration and Ce0 is the initial concentration of palladium in the external aqueous feed solution
Effect of the Carrier Concentration The effect of LIX 984N-C concentration was studied in the range of 5% to 12% by weight of the membrane phase at an external feed pH of 2, while maintaining all other operating conditions constant
Summary
Much attention has been paid on the development of an efficient treating process for industrial wastes because they have a probability of destroying the global environment [1,2]. Solvent extraction is a common hydrometallurgical process for the recovery of palladium from most industrial plants. Emulsion liquid membranes (ELMs) [13], on the other hand a promising technology for the separation of heavy metal ions from aqueous effluent streams, has re-. The treatment of aqueous streams contaminated with palladium by ELMs using a bi-functional surfactant has been reported [14,15]. A combination of salicylaldoximes with extractive strength and fast kinetics and ketoximes with proven excellent physical performance and stability led to the development of LIX 984N-C, which was found to effectively extract copper from aqueous acidic medium [17,18]. The extraction of palladium from aqueous hydrochloric acid medium containing a low concentration of palladium (10 ppm) by ELMs using LIX 984N-C as an extractant is carried out.
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