Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs

The presence of valuable and hazardous metals in waste printed circuit boards, especially, motherboards, makes their recovery necessary as implies great economic and environmental advantages and develops urban mining processes. Hence, this research is focused on the selective leaching of Cu, Pb, and...

Descripción completa

Detalles Bibliográficos
Autores: Rahimi, Vahid, Inzulza Moraga, Emilio Antonio, Gómez Díaz, Diego, Freire Leira, María Sonia, González Álvarez, Julia
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Universidad de Santiago de Compostela (USC)
Repositorio:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
Idioma:inglés
OAI Identifier:oai:minerva.usc.gal:10347/33755
Acceso en línea:http://hdl.handle.net/10347/33755
Access Level:acceso abierto
id ES_49161aba71e1a5f78f7d8a4f4bf08103
oai_identifier_str oai:minerva.usc.gal:10347/33755
network_acronym_str ES
network_name_str España
repository_id_str
spelling Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBsRahimi, VahidInzulza Moraga, Emilio AntonioGómez Díaz, DiegoFreire Leira, María SoniaGonzález Álvarez, JuliaThe presence of valuable and hazardous metals in waste printed circuit boards, especially, motherboards, makes their recovery necessary as implies great economic and environmental advantages and develops urban mining processes. Hence, this research is focused on the selective leaching of Cu, Pb, and Sn as base metals using nitric acid and hydrochloric acid and Au, Ag, and Pd as precious metals using thiourea and sodium thiosulfate from waste motherboards’ PCBs in a sequential eco-friendly two-stage process. Previously, thiourea and sodium thiosulfate were used as leaching agents to investigate their applicability for the leaching of metals from PCBs in a single-stage process. Screening experimental design was applied to screen the variables affecting the leaching process in order to evaluate their impact on the recovery of metals and select the significant factors. The results demonstrated that base and precious metals can be leached appropriately in two consecutive stages compared to a single-stage process. Nitric acid was found to be a much more efficient agent to leach Cu and Pb in comparison with hydrochloric acid which was more suitable for the leaching of Sn. In the case of precious metals, higher amounts of Au were leached using thiourea, whereas sodium thiosulfate was able to leach more Pd. Roughly similar results were obtained for the leaching of Ag using these leaching agents. Nitric acid concentration, average particle size, temperature, and leaching time were found to be significant to maximize the leaching of Cu and Pb and minimize that for Au, Ag, and Pd in the first stage. Initial pH was the only variable influencing the second stage, in particular, Au leaching by thioureaSpringerUniversidade de Santiago de Compostela. Departamento de Enxeñaría QuímicaÁrea de Enxeñaría e Arquitectura20242024-01-0120242024-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10347/33755reponame:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostelainstname:Universidad de Santiago de Compostela (USC)InglésengAgencia Estatal de Investigación http://dx.doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023 PID2021-122923NB-I00open accesshttp://purl.org/coar/access_right/c_abf2Atribución 4.0 Internacionalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:minerva.usc.gal:10347/337552026-06-15T12:47:27Z
dc.title.none.fl_str_mv Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs
title Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs
spellingShingle Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs
Rahimi, Vahid
title_short Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs
title_full Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs
title_fullStr Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs
title_full_unstemmed Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs
title_sort Screening of variables affecting the selective leaching of valuable metals from waste motherboards’ PCBs
dc.creator.none.fl_str_mv Rahimi, Vahid
Inzulza Moraga, Emilio Antonio
Gómez Díaz, Diego
Freire Leira, María Sonia
González Álvarez, Julia
author Rahimi, Vahid
author_facet Rahimi, Vahid
Inzulza Moraga, Emilio Antonio
Gómez Díaz, Diego
Freire Leira, María Sonia
González Álvarez, Julia
author_role author
author2 Inzulza Moraga, Emilio Antonio
Gómez Díaz, Diego
Freire Leira, María Sonia
González Álvarez, Julia
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade de Santiago de Compostela. Departamento de Enxeñaría Química
Área de Enxeñaría e Arquitectura
description The presence of valuable and hazardous metals in waste printed circuit boards, especially, motherboards, makes their recovery necessary as implies great economic and environmental advantages and develops urban mining processes. Hence, this research is focused on the selective leaching of Cu, Pb, and Sn as base metals using nitric acid and hydrochloric acid and Au, Ag, and Pd as precious metals using thiourea and sodium thiosulfate from waste motherboards’ PCBs in a sequential eco-friendly two-stage process. Previously, thiourea and sodium thiosulfate were used as leaching agents to investigate their applicability for the leaching of metals from PCBs in a single-stage process. Screening experimental design was applied to screen the variables affecting the leaching process in order to evaluate their impact on the recovery of metals and select the significant factors. The results demonstrated that base and precious metals can be leached appropriately in two consecutive stages compared to a single-stage process. Nitric acid was found to be a much more efficient agent to leach Cu and Pb in comparison with hydrochloric acid which was more suitable for the leaching of Sn. In the case of precious metals, higher amounts of Au were leached using thiourea, whereas sodium thiosulfate was able to leach more Pd. Roughly similar results were obtained for the leaching of Ag using these leaching agents. Nitric acid concentration, average particle size, temperature, and leaching time were found to be significant to maximize the leaching of Cu and Pb and minimize that for Au, Ag, and Pd in the first stage. Initial pH was the only variable influencing the second stage, in particular, Au leaching by thiourea
publishDate 2024
dc.date.none.fl_str_mv 2024
2024-01-01
2024
2024-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10347/33755
url http://hdl.handle.net/10347/33755
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Agencia Estatal de Investigación http://dx.doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023 PID2021-122923NB-I00
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 4.0 Internacional
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 4.0 Internacional
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
instname:Universidad de Santiago de Compostela (USC)
instname_str Universidad de Santiago de Compostela (USC)
reponame_str Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
collection Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869407400525561856
score 15,811543

Similares en LA Referencia