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Application of emulsion liquid membranes in the extraction of rhodium from mining and metal refinery effluent
Expanded Title:This project set out to investigate the application of emulsion liquid membranes (ELMs) in recovering platinum group metals (PGMs) from the aqueous by-products of PGM refining. The by-products are generated as sidestreams which require storage and reprocessing. Of the PGMs, rhodium (Rh) is one of the more inert and therefore difficult to extract. Membranes have historically been viewed as semipermeable barriers between two adjacent phases. From the operational point of view, membranes are easy to bring to the industrial scale for the following reasons: the underlying scientific concepts are relatively simple, their operation and scale-up is uncomplicated to achieve, and they are environmentally-friendly and low-cost from the energy point of view. Membranes can consist of polymer films and liquids. If the membrane system is based on a liquid matrix, then it is called a liquid membrane. Liquid membrane systems involve contacting of an immiscible organic liquid (named the diluent) with a feed phase (i.e. the wastewater or effluent of interest). The application of emulsion liquid membranes (ELMs) reduces energy and financial costs and the time for the metal solvent extraction. This is caused by the faster kinetics of extraction with ELMs and higher extraction yields in comparison with the classical solvent extraction. An ELM was prepared by using 28-30% solution of toluene in kerosene and a microdroplet diameter of 1 3 µm. This diluent phase was then mixed with a stripping phase. Extraction of Rh from aqueous matrices was tested and the results showed that the complete extraction of Rh was possible. This was achieved by the use of an optimised ELM. Carryover of the diluent components into the stripping phase and effluent was observed and further work is recommended to overcome this drawback.
Date Published:04/11/2013
Document Type:Research Report
Document Subjects:Wastewater Management - Industrial, Mine water - Mine water treatment
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2011/1/13
ISBN No:978-1-4312-0477-9
Authors:Tandlich R; Luyt C; Tyalana K; Moyo F
Project No:K5/2011
Organizations:Rhodes University
Document Size:2 752 KB
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