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Fundamental Studies for the Removal and Recovery of Silver from Waste Photo-Developing Solution by Solvent Extraction  

Lee, Sun-Hwa (Department of Environmental Science and Engineering Ewha Womans University)
Kim, Dong-Su (Department of Environmental Science and Engineering Ewha Womans University)
Lee, Hwa-Young (Metal Processing Research Center Korea Institute of Science and Technology)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.1, 2006 , pp. 122-127 More about this Journal
Abstract
Fundamental studies were carried out for an effective removal and recovery of silver from waste photo-developing solution by solvent extraction. The organic solvents examined for silver-extraction were ALIQUAT 336, D2EHPA, KELEX 100, and TBP. ALIQUAT 336, which is an anionic exchanger, was found to be efficient for the extraction of silver and the reason for this was considered to be due to the chloride ion contained in its structure. The extent of silver extraction was examined to increase with the concentration of ALIQUAT 336 until it reached 0.6 M and no more extraction was observed above this concentration. The extraction of silver by ALIQUAT 336 was found to reach its pseudo-equilibrium within a few minutes after the reaction started and additional slight increase in silver extraction was observed until 30 minutes of reaction time. The observed differences in silver extraction for artificial and actual waste solutions were considered to be based upon the different ionic form of silver-containing species in these solutions.
Keywords
ALIQUAT 336; Removal and recovery; Silver; Solvent extraction; Waste photo-developing solution;
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