Abstract
A Liquid Emulsion Mmenrane (LEM) containing Cyanex 301 as a carrier and Span 80 as a surfactant was used for the extraction of Co-(II) from nitric acid solution. Various diluents were tested and cyclohexane was found the most effective diluent in the cobalt extraction. The effect of different factors affecting the permeation of cobalt through LEM (e.g pH of the extrenal phase, type and concentration of stripping internal phase, the equilibrium time, and Cyanex 301 conentration) were investigated. The effects of surfactant types and cocentrations on the stbility of LEM were also studied. It was found that the optimum conditions for cobalt extraction using 8% Cyanex 301 were as follows; 3M HCl as an internal phase, 4% span 80 as a surfactant and by using the best conditions 10 ml of prepared LEM can extract about 96.86% of 1 gm/l of cobalt in Nitric acid solution after 5 min. in the reactor tank.
Highlights
Cobalt has many industrial and nuclear applications, where it is used to produce some alloys with iron, nickel, chromium, and manganese [1]
Liquid emulsion membrane (LEM) process has certainly some attractive features. e.g., simple operation, high efficiency, both extraction and stripping steps were combined in one stage, which led to simultaneous purification and concentration of the solute [2]
[32] these carrier were deeply used in metal extraction by liquid emulsion membrane (LEM) technique, they were used in high concentration up to 20% [33]
Summary
Cobalt has many industrial and nuclear applications, where it is used to produce some alloys with iron, nickel, chromium, and manganese [1]. 37] studied the separation of cobalt, nickel and copper by solvent extraction using di-(2-ethyheyl) phosphonic acid (PC88A) as liquid cation exchangers and using. Investigated the applicability of LEM process for removal of cobalt and studied the extraction of cobalt from simulated industrial leaching liquor by liquid surfactant membranes using CYANEX 302 as a carrier and good results for cobalt-nickel separation by the supported liquid membrane technique was obtained. The optimum conditions for Co (II) extraction from nitrate medium by LEM were examined In this concern, the effects of various parameters on cobalt (II) extraction were investigated
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