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- W2340387773 abstract "Zinc was extracted from a water solution using emulsion liquid membrane technology. The internal phase acidity, the surface active agent concentration (SPAN 20) and the carrier (DEHPA) effects on metal separation were analyzed. The extraction of zinc from a 500 ppm effluent, without additives in the external aqueous phase, is 33.4% in ten minutes of operation. It was found that the addition of basic or acid buffer’s solutions, improves the extraction to 75.8%, 75.7% and 86.7% when citric acid/sodium citrate, ammonia/ammonium chloride and ammonia are added to the external phase, respectively. Changes in the carrier, the surfactant concentration and the acidity of the internal phase have a similar effect: a gradual increase on the extraction when concentration increases until a maximum is reached. Optimal concentrations for maximum extraction are 0.75% of SPAN 20, 4% v/v DEHPA and 1,5M sulfuric acid. Using this formulation for the emulsion, the extraction of zinc is 36%. An increase in agitation speed from 100 r.p.m. to 250 r.p.m. allows improving the extraction to 94%. This formulation, in the same stirring conditions, allowed an extraction of 57.3% of the copper from water samples." @default.
- W2340387773 created "2016-06-24" @default.
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- W2340387773 date "2008-01-01" @default.
- W2340387773 modified "2023-09-23" @default.
- W2340387773 title "Extracción de zinc y cobre mediante membranas líquidas emulsionadas en diferentes condiciones fisicoquímicas de la fase externa Zinc and copper extraction using liquid emulsion membranes with different external phase physicochemical conditions" @default.
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