Europium, Yttrium, and Indium Recovery from Electronic Wastes
Waste electrical and electronic equipment (WEEE) has increased in recent decades due to the continuous advancement of technology in the modern world. These residues have various metals that are found in concentrations that make their recovery profitable. A group of metals of interest are the rare ea...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2018-09-01
|
Series: | Metals |
Subjects: | |
Online Access: | http://www.mdpi.com/2075-4701/8/10/777 |
id |
doaj-b11638f0dd5943f8836da85301ff1e88 |
---|---|
record_format |
Article |
spelling |
doaj-b11638f0dd5943f8836da85301ff1e882020-11-24T21:08:45ZengMDPI AGMetals2075-47012018-09-0181077710.3390/met8100777met8100777Europium, Yttrium, and Indium Recovery from Electronic WastesErnesto de la Torre0Estefanía Vargas1César Ron2Sebastián Gámez3Department of Extractive Metallurgy, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170517, EcuadorDepartment of Extractive Metallurgy, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170517, EcuadorDepartment of Extractive Metallurgy, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170517, EcuadorDepartment of Extractive Metallurgy, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170517, EcuadorWaste electrical and electronic equipment (WEEE) has increased in recent decades due to the continuous advancement of technology in the modern world. These residues have various metals that are found in concentrations that make their recovery profitable. A group of metals of interest are the rare earths such as europium and yttrium, as well as semiconductors such as indium. Yttrium was recovered from cathode ray tubes that were manually dismantled. The resulted powder was leached with HNO3, and then the solution was submitted to solvent extraction with di-(2-ethylhexyl) phosphoric acid (DEHPA) using n-heptane as a diluent. For re-extraction, HNO3 was used again, and yttrium was precipitated by adding four times the stoichiometric amount of oxalic acid, reaching 68% yttrium purity. Indium was recovered from the liquid crystal display (LCD) screens for which the pulverized material was leached with H2SO4. Then, the indium sulfate was subjected to solvent extraction using DEHPA as an extractant, and diesel as a diluent. The re-extraction was carried out again with H2SO4, and the obtained acid solution was evaporated until the indium precipitated, reaching a recovery of 95%. The investigations that were carried out show that it is feasible to recover these metals in the form of oxides or phosphates with high commercial value.http://www.mdpi.com/2075-4701/8/10/777WEEEyttriumindiumhydrometallurgy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ernesto de la Torre Estefanía Vargas César Ron Sebastián Gámez |
spellingShingle |
Ernesto de la Torre Estefanía Vargas César Ron Sebastián Gámez Europium, Yttrium, and Indium Recovery from Electronic Wastes Metals WEEE yttrium indium hydrometallurgy |
author_facet |
Ernesto de la Torre Estefanía Vargas César Ron Sebastián Gámez |
author_sort |
Ernesto de la Torre |
title |
Europium, Yttrium, and Indium Recovery from Electronic Wastes |
title_short |
Europium, Yttrium, and Indium Recovery from Electronic Wastes |
title_full |
Europium, Yttrium, and Indium Recovery from Electronic Wastes |
title_fullStr |
Europium, Yttrium, and Indium Recovery from Electronic Wastes |
title_full_unstemmed |
Europium, Yttrium, and Indium Recovery from Electronic Wastes |
title_sort |
europium, yttrium, and indium recovery from electronic wastes |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2018-09-01 |
description |
Waste electrical and electronic equipment (WEEE) has increased in recent decades due to the continuous advancement of technology in the modern world. These residues have various metals that are found in concentrations that make their recovery profitable. A group of metals of interest are the rare earths such as europium and yttrium, as well as semiconductors such as indium. Yttrium was recovered from cathode ray tubes that were manually dismantled. The resulted powder was leached with HNO3, and then the solution was submitted to solvent extraction with di-(2-ethylhexyl) phosphoric acid (DEHPA) using n-heptane as a diluent. For re-extraction, HNO3 was used again, and yttrium was precipitated by adding four times the stoichiometric amount of oxalic acid, reaching 68% yttrium purity. Indium was recovered from the liquid crystal display (LCD) screens for which the pulverized material was leached with H2SO4. Then, the indium sulfate was subjected to solvent extraction using DEHPA as an extractant, and diesel as a diluent. The re-extraction was carried out again with H2SO4, and the obtained acid solution was evaporated until the indium precipitated, reaching a recovery of 95%. The investigations that were carried out show that it is feasible to recover these metals in the form of oxides or phosphates with high commercial value. |
topic |
WEEE yttrium indium hydrometallurgy |
url |
http://www.mdpi.com/2075-4701/8/10/777 |
work_keys_str_mv |
AT ernestodelatorre europiumyttriumandindiumrecoveryfromelectronicwastes AT estefaniavargas europiumyttriumandindiumrecoveryfromelectronicwastes AT cesarron europiumyttriumandindiumrecoveryfromelectronicwastes AT sebastiangamez europiumyttriumandindiumrecoveryfromelectronicwastes |
_version_ |
1716759546429440000 |