Abstract
The liquid membrane technique is a simultaneous extraction-stripping process which can be successfully used for copper recovery. Up to 98% copper can be removed within 30 min from acid feed solutions at a feed solution/liquid membrane ratio of 13:1 and a membrane/stripping phase ratio of 1:1. Using an ion-pumping liquid membrane, copper could be enriched within liquid membrane capsules up to a ratio of 500:1. A model is presented which adequately describes the kinetics of copper removal by liquid surfactant membranes. Mass transfer parameters ( k L a) were determined by means of this model and found to range from 1 X 10 −4 to 1 x 10 −3 sec −1.
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