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241116s2024 xx |||||o 00| ||eng c |
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|a 10.1080/09593330.2024.2423906
|2 doi
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|a pubmed24n1602.xml
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|a (DE-627)NLM380268981
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|a (NLM)39540455
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|a eng
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|a Diallo, Salmata
|e verfasserin
|4 aut
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|a Selective leaching of rare earths, base metals and precious metals from used smartphones
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|c 2024
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 14.11.2024
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|a published: Print-Electronic
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|a Citation Status Publisher
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|a Discarded smartphones represent a valuable source of rare earths (REE), base metals and precious metals. This study focussed on the optimisation of three-stage selective leaching conditions for REE, copper and precious metals (Au and Ag), respectively, contained in printed circuit boards (PCBs) found in end-of-life smartphones. The effects of several leaching conditions, such as sulphuric acid and thiourea concentrations, were investigated using a statistical approach based on a design of experiments using Box-Behnken methodology. Optimum leaching efficiencies were achieved when PCB powder was contacted (solid concentration of 100 g/L) with (1) a 0.2 M H2SO4 solution for 30 min at a temperature of 20°C for REEs; (2) a 1 M H2SO4 solution with 67 g H2O2/L for 180 min at 80°C for Cu and (3) a solution of 42 g thiourea/L in 0.1 M H2SO4 and 9 g Fe2(SO4)3/L for 120 min at 20°C for Au and Ag. Using these optimal conditions, a complete leaching procedure included an REE solubilisation step and a base metal leaching step, both repeated twice, and a precious metal leaching step. This procedure solubilised 91% of the REE, 100% of the copper, 98% of the gold and 87% of the silver contained in the PCB powder during their respective leaching stages
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|a Journal Article
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|a E-waste
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|a Selective leaching
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|a copper
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|a precious metals
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|a rare earth element
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|a Tran, Lan-Huong
|e verfasserin
|4 aut
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|a Larivière, Dominic
|e verfasserin
|4 aut
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|a Blais, Jean-François
|e verfasserin
|4 aut
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|i Enthalten in
|t Environmental technology
|d 1993
|g (2024) vom: 14. Nov., Seite 1-16
|w (DE-627)NLM098202545
|x 1479-487X
|7 nnns
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|g year:2024
|g day:14
|g month:11
|g pages:1-16
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|u http://dx.doi.org/10.1080/09593330.2024.2423906
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