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Extraction of nickel with membrane capsules

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dc.contributor.advisor Smit JJ, Prof en
dc.contributor.author Koekemoer LR en
dc.date.accessioned 2016-09-22T07:17:26Z
dc.date.available 2016-09-22T07:17:26Z
dc.date.created 1996 en
dc.date.submitted 1997 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/11347
dc.description.abstract In the past few years there has been an increase in environmental awareness. This forced industries to be more careful with the waste they generate. The cleaning and upgrading of metal-containing waste streams have become a very demanding assignment. The cleaning of nickel waste streams has the additional advantage that it is a very valuable metal and the process can be profitable. A new approach to supported liquid membrane (SLM) extraction, whereby the strip solution is encapsulated within a microporous membrane capsule, was used for the experiments. The capsule constitutes an unconfined reactor and does not have the disadvantage of an excessively high cost to configure the required packing density (m2/m3). The capsule has the additional advantage that very high acid concentrations can be used in the strip solution without the risk of high corrosion. Experiments were executed to characterise the extraction of nickel with capsule membrane extraction (CME) at high hydronium ion strip concentrations. This is a prominent advantage of CME over supported liquid membranes (SLM). Subsequent experiments were performed to determine the optimum conditions for the extraction of nickel with CME. The research shows that it is possible to obtain a final extraction of about 109 g/m2 at a rate where 90 percent of the extraction occurs within the first 3.45 hours. This implies that a membrane capsules costing less than R 3,46/m2 can be used to recover nickel at economic break-even conditions. The assumption was made that the CME system can be viewed as a pseudo catalytic reaction and that the extraction rate equation can be developed in an empirical way, such as traditionally applied to catalytic reactions. A rate equation was developed for the extraction of nickel with CME and proved to be a practical and elegant equation which takes cognisance of all relevant effects. The rate equation was shown to fit the experimental data to a highly acceptable accuracy and explained 94.4 percent of the variance. The above-mentioned assumption is thus validated. en
dc.language English en
dc.subject Chemical engineering en
dc.title Extraction of nickel with membrane capsules en
dc.type Masters degree en
dc.description.degree MIng en

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