Recovery of Silver from Dilute Effluents via Electrodeposition and Redox Replacement
| Autor: | Fupeng Liu, Kirsi Yliniemi, Zulin Wang, Petteri Halli, Pyry Hannula, Mari Lundström, Benjamin P. Wilson |
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| Přispěvatelé: | Department of Chemical and Metallurgical Engineering, Department of Chemistry and Materials Science, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
ZINC DEPOSITION SURFACE 020209 energy SOLVENT-EXTRACTION chemistry.chemical_element 02 engineering and technology Redox Catalysis chemistry.chemical_compound REMOVAL DISSOLUTION 0202 electrical engineering electronic engineering information engineering Materials Chemistry Electrochemistry Dissolution ta215 PLATINUM CATALYST Renewable Energy Sustainability and the Environment IMPURITIES Sulfuric acid Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry AU GROWTH Leaching (metallurgy) Platinum Silver oxide Electrowinning Nuclear chemistry |
| Zdroj: | JOURNAL OF THE ELECTROCHEMICAL SOCIETY. 166(8):E266-E274 |
| ISSN: | 0013-4651 |
| Popis: | In this study, the electrodeposition-redox replacement (EDRR) method was studied for the recovery of minor concentrations of silver from dilute solutions. The parameter optimization was carried out with synthetic solutions similar to silver oxide button battery recycling effluents, consisting of sulfuric acid and concentrated base metal (10 gL−1 H2SO4, 60 g/L Zn2+) with a minor amount of silver (100 ppm) and a varying amount of Fe3+ ions. Results of these experiments were analyzed both electrochemically and by use of SEM-EDS. The role of dissolved Fe3+ ions was studied by varying the concentration from 0 to 1000 ppm and the results showed that although the presence of Fe ions decreased silver recovery efficiency, final product purity was found to increase slightly. The EDRR process was also found to be more effective for Ag recovery and has less energy consumption when Fe3+ concentrations are relatively low (≤ 100 ppm) when compared with conventional direct current electrowinning. In the final stage, silver was successfully recovered via EDRR, using the optimized conditions, from a real pregnant leaching solution (PLS) obtained from the leaching of silver oxide batteries. |
| Databáze: | OpenAIRE |
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