Pseudo‐emulsion based hollow fiber strip dispersion: A novel methodology for gold recovery

Abstract

This article presents the study of Au(I) extraction from synthetic cyanide media through pseudo‐emulsion based hollow fiber strip dispersion (PEHFSD) containing LIX‐79/n‐heptane as extractant in the form of a pseudo‐emulsion with NaOH. The permeation of Au(I) is investigated as a function of various experimental variables: hydrodynamic conditions, feed pH, LIX‐79 concentration in pseudo‐emulsion, cyanide concentration in feed phase, NaOH concentration in pseudo‐emulsion as a strippant, and initial Au(I) concentration in feed phase. In PEHFSD, pseudo‐emulsion is an emulsion that is formed temporarily between organic and stripping solutions. The organic and aqueous solutions are separated when the stirring device is stopped. In this study, feed was circulated through the tube side in counter current mode. The linear flow velocity of the feed was varied between 0.74 and 2.58 cm/s and the linear flow velocity of the pseudo‐emulsion was maintained at 0.28 cm/s. The value of the permeation coefficient obtained under standard experimental conditions was 8.19 × 10−5 cm/s. The selectivity of LIX‐79/n‐heptane based PEHFSD toward different metal cyanide salts such as Fe(II), Cu(I), Ni(II), Zn(II), and Ag(I) was also examined. © 2007 American Institute of Chemical Engineers AIChE J, 2008

Dispersion-Free Solvent Extraction of Cr(VI) from Acidic Solutions Using Hollow Fiber Contactor

“…In the present case, k m is 3.3 × 10 -5 cm/s, for an estimate D org value of 10 -6 cm 2 /s (10,(13)(14)(15). It should be pointed out that the value of k m is within the magnitude order of membrane mass transfer coefficient found elsewhere (8).…”

Supported liquid membranes with strip dispersion for the recovery of Cephalexin

“…Previous literature on SLM with strip dispersion has focused on the removal and recovery of heavy metals such as chromium [13], copper [14], zinc [14], cobalt [14], strontium [15], uranium [16], gold [17], and cadmium [18]. Studies have ranged from lab to pilot plant scales and have demonstrated that SLM with strip dispersion can efficiently remove metals from aqueous solutions, while also recovering them in high concentrations in the aqueous strip solution.…”

Pseudo-emulsion based hollow fibre strip dispersion (PEHFSD) technique for permeation of Cr(VI) using Cyanex-923 as carrier

“…To avoid the problem of the contamination of the aqueous feed solution by the emulsion at a higher flow rate (11.66 cm 3 /s), the 5.56 cm 3 /s linear flow rate was selected throughout the study. The importance of pressure control across the tube and shell side hollow fibre contactor in the PEHFSD is also described in a previous publication in which metal separation from different media was carried out [34][35][36].…”