The paper is focused on the application of solvent extraction for the recovery of rare earth elements from sulfuric leaching solutions obtained by the dissolution of fluorescent powders of lamps. The efficiency on rare earths extractions of three extractants, Cyanex 272, Cyanex 572 and D2EHPA in kerosene were investigated as a function of pH levels. Similar extraction for all the rare earths elements were observed, but the tests performed with D2EHPA showed that for pH values less than 1, yttrium and terbium could be extracted with yields higher than the other rare earths. The orders of the extraction were determined: yttrium ≥ terbium > gadolinium ≥ europium > cerium ≥ lanthanum. Further tests showed the optimal conditions, under the investigated ones, to extract yttrium with traces of terbium and cerium from sulfate leaching solutions. According to the experimental results, operating conditions of extractions were proposed in order to establish the guidelines for the following stripping and operation steps to recover rare earths selectively or at least in groups of them. A simulation of the proposed process was performed using a specific software in order to define the mass and energy balance of the entire recycling treatment of spent lamps.

Application of solvent extraction operation to recover rare earths from fluorescent lamps / Innocenzi, Valentina; Ippolito, Nicolò Maria; Pietrelli, Loris; Centofanti, Marcello; Piga, Luigi; Vegliò, Francesco. - In: JOURNAL OF CLEANER PRODUCTION. - ISSN 0959-6526. - 172:(2018), pp. 2840-2852. [10.1016/j.jclepro.2017.11.129]

Application of solvent extraction operation to recover rare earths from fluorescent lamps

Ippolito, Nicolò Maria;Piga, Luigi;Vegliò, Francesco
2018

Abstract

The paper is focused on the application of solvent extraction for the recovery of rare earth elements from sulfuric leaching solutions obtained by the dissolution of fluorescent powders of lamps. The efficiency on rare earths extractions of three extractants, Cyanex 272, Cyanex 572 and D2EHPA in kerosene were investigated as a function of pH levels. Similar extraction for all the rare earths elements were observed, but the tests performed with D2EHPA showed that for pH values less than 1, yttrium and terbium could be extracted with yields higher than the other rare earths. The orders of the extraction were determined: yttrium ≥ terbium > gadolinium ≥ europium > cerium ≥ lanthanum. Further tests showed the optimal conditions, under the investigated ones, to extract yttrium with traces of terbium and cerium from sulfate leaching solutions. According to the experimental results, operating conditions of extractions were proposed in order to establish the guidelines for the following stripping and operation steps to recover rare earths selectively or at least in groups of them. A simulation of the proposed process was performed using a specific software in order to define the mass and energy balance of the entire recycling treatment of spent lamps.
2018
Hazardous material; Hydrometallurgical process; Rare earths recovery; Solvent extraction; Spent fluorescent lamps; Terbium; Renewable Energy, Sustainability and the Environment; 2300; Strategy and Management1409 Tourism, Leisure and Hospitality Management; Industrial and Manufacturing Engineering
01 Pubblicazione su rivista::01a Articolo in rivista
Application of solvent extraction operation to recover rare earths from fluorescent lamps / Innocenzi, Valentina; Ippolito, Nicolò Maria; Pietrelli, Loris; Centofanti, Marcello; Piga, Luigi; Vegliò, Francesco. - In: JOURNAL OF CLEANER PRODUCTION. - ISSN 0959-6526. - 172:(2018), pp. 2840-2852. [10.1016/j.jclepro.2017.11.129]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1117055
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