A novel operational mode of foam separation was suggested in this study. In a conventional
operation, the separation of a target solute has its own limit because non-target ones
exist in the interstitial water between foam and get mixed in the recovered foamate solution. As a
countermeasure for this inherent drawback in foam separation, an aqueous surfactant solution
was injected into the rising foam bed to enhance a downflow of the interstitial water containing
unfavourable solutes. The flow characteristics of the system with and without the injection of a
washing solution were investigated in terms of the liquid holdup, f, and the drainage velocity,
ULD, under various operating conditions. Their correlation was obtained as ULD
(cm s 21) ¼ 1.85f2 þ 0.0005. The application to metal separation was also performed using a
nonionic surfactant, polyoxyethylene nonylphenyl ether (PONPE 20), with an affinity to Au(III).
The non-specific metal, Cu(II), was effectively washed out from the foam bed, and satisfactory
separation of Au(III) was attained.
Keywords: foam separation; gold recovery; foam bed washing; liquid holdup; drainage velocity
A novel operational mode of foam separation was suggested in this study. In a conventionaloperation, the separation of a target solute has its own limit because non-target onesexist in the interstitial water between foam and get mixed in the recovered foamate solution. As acountermeasure for this inherent drawback in foam separation, an aqueous surfactant solutionwas injected into the rising foam bed to enhance a downflow of the interstitial water containingunfavourable solutes. The flow characteristics of the system with and without the injection of awashing solution were investigated in terms of the liquid holdup, f, and the drainage velocity,ULD, under various operating conditions. Their correlation was obtained as ULD(cm s 21) ¼ 1.85f2 þ 0.0005. The application to metal separation was also performed using anonionic surfactant, polyoxyethylene nonylphenyl ether (PONPE 20), with an affinity to Au(III).The non-specific metal, Cu(II), was effectively washed out from the foam bed, and satisfactoryseparation of Au(III) was attained.Keywords: foam separation; gold recovery; foam bed washing; liquid holdup; drainage velocity
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