Selective leaching of Zn from spent alkaline batteries using environmentally friendly approaches

Copyright © 2017 Elsevier Ltd. All rights reserved.

Bibliographische Detailangaben
Veröffentlicht in:Waste management (New York, N.Y.). - 1999. - 60(2017) vom: 03. Feb., Seite 696-705
1. Verfasser: Maryam Sadeghi, S (VerfasserIn)
Weitere Verfasser: Vanpeteghem, Guillaumme, Neto, Isabel F F, Soares, Helena M V M
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Waste management (New York, N.Y.)
Schlagworte:Journal Article Acid leaching Alkaline leaching Microwave-assisted leaching Spent alkaline batteries Ultrasound-assisted leaching Zinc recovery Zinc J41CSQ7QDS
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520 |a The main aim of this work was to evaluate the possibility of using microwave or ultrasound to assist the efficient and selective leaching of Zn from spent alkaline batteries and compare the results with those obtained using the conventional method. Two different strategies were applied: acid leaching of a washed residue and alkaline leaching of the original residue. In both (acid and alkaline) approaches, the use of microwave- or ultrasound-assisted leaching increased the extraction of Zn compared with the best results obtained using conventional leaching [acid leaching (1.5mol/L H2SO4, 3h, 80°C), 90% of Zn extracted; alkaline leaching (6mol/L NaOH, 3h, 80°C), 42% of Zn extracted]. With acid leaching, 94% of the Zn was extracted using microwave-assisted leaching (1 cycle, 30s, 1mol/L H2SO4), and 92% of the Zn was extracted using ultrasound-assisted leaching (2min, 0.1p, 20% amplitude, 1mol/L H2SO4). Ultrasound-assisted leaching resulted in a more selective (Zn/Mn ratio of 5.1) Zn extraction than microwave-assisted leaching (Zn/Mn ratio of 3.5); both processes generated a concentrated Zn solution (⩾18.7g/L) with a purity (83.3% and 77.7%, respectively) that was suitable for electrowinning. With alkaline leaching, microwave- (1 cycle, 3 min, 4mol/L NaOH) and ultrasound-assisted (14min, 0.1p, 20% amplitude, 4mol/L NaOH) leaching extracted about 80% of the Zn and less than 0.01% of the Mn, which resulted in lesser concentrated Zn solutions (approximately 16.5g/L) but with high purity (>99.5%) that was suitable for the recovery of Zn by precipitation. The microwave- and ultrasound-assisted leaching strategies used in this work proved to be efficient and environmentally-friendly approaches for the extraction of Zn from spent alkaline residues since a concentrated Zn solution with adequate purity for subsequent Zn recovery was obtained using significantly decreased leaching times and concentrations of chemicals 
650 4 |a Journal Article 
650 4 |a Acid leaching 
650 4 |a Alkaline leaching 
650 4 |a Microwave-assisted leaching 
650 4 |a Spent alkaline batteries 
650 4 |a Ultrasound-assisted leaching 
650 4 |a Zinc recovery 
650 7 |a Zinc  |2 NLM 
650 7 |a J41CSQ7QDS  |2 NLM 
700 1 |a Vanpeteghem, Guillaumme  |e verfasserin  |4 aut 
700 1 |a Neto, Isabel F F  |e verfasserin  |4 aut 
700 1 |a Soares, Helena M V M  |e verfasserin  |4 aut 
773 0 8 |i Enthalten in  |t Waste management (New York, N.Y.)  |d 1999  |g 60(2017) vom: 03. Feb., Seite 696-705  |w (DE-627)NLM098197061  |x 1879-2456  |7 nnns 
773 1 8 |g volume:60  |g year:2017  |g day:03  |g month:02  |g pages:696-705 
856 4 0 |u http://dx.doi.org/10.1016/j.wasman.2016.12.002  |3 Volltext 
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