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The recovery of copper by tubular supported liquid membranes
Author(s)
Aziz, Mujahid
Date Issued
2006
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
During recent years, the use of liquid membranes has gained general interest in the treatment of
effiuents where solute concentrations are low and large volumes of solutions should be processed,
and, if possible, without generating any secondary waste. Liquid membrane processes have been
proposed as a clean technology, owing to their characteristics, i.e. high specificity, low energy and
utilization. Two liquid membrane processes have been used in metal recovery, which are the
liquid surfactant membrane (LSM), which corresponds to double water-in-oil emulsion and solid .
supported liquid membranes (SLM), which are made by dispersing or impregnating the extractant
within the pores of in.ert solid support.
Previously, the recovery of eu (IT) in a SLM system was conducted by other membrane models
such as hollow fibre, spiral and flat sheet. Only a small measure of success on scale-up and
industrialization of these models has been attained. One of the disadvantages of the hollow fibre
system was the small lumen size through which the feed needed to pass. Pores became clogged by
suspended particles because the pressure drop over the small diameter augments lower flow rates
and therefore, pre-filtering is necessary (Rathore, et al., 2001).
In this study the behaviour of a tubular SLM reactor with an inner diameter of the lumen
approximately fifty times bigger than that of the hollow fibre are used in order to solve the
problem of clogging. This tubular reactor was incorporated in to a bench scale plant and proved
successful in copper extraction. By observing transient data, mass transport coefficients were
determined and compared to published values.
effiuents where solute concentrations are low and large volumes of solutions should be processed,
and, if possible, without generating any secondary waste. Liquid membrane processes have been
proposed as a clean technology, owing to their characteristics, i.e. high specificity, low energy and
utilization. Two liquid membrane processes have been used in metal recovery, which are the
liquid surfactant membrane (LSM), which corresponds to double water-in-oil emulsion and solid .
supported liquid membranes (SLM), which are made by dispersing or impregnating the extractant
within the pores of in.ert solid support.
Previously, the recovery of eu (IT) in a SLM system was conducted by other membrane models
such as hollow fibre, spiral and flat sheet. Only a small measure of success on scale-up and
industrialization of these models has been attained. One of the disadvantages of the hollow fibre
system was the small lumen size through which the feed needed to pass. Pores became clogged by
suspended particles because the pressure drop over the small diameter augments lower flow rates
and therefore, pre-filtering is necessary (Rathore, et al., 2001).
In this study the behaviour of a tubular SLM reactor with an inner diameter of the lumen
approximately fifty times bigger than that of the hollow fibre are used in order to solve the
problem of clogging. This tubular reactor was incorporated in to a bench scale plant and proved
successful in copper extraction. By observing transient data, mass transport coefficients were
determined and compared to published values.
Additional information
Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, Cape Town, 2006
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