A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags

A management process for saline slags, one of the wastes from Secondary Aluminum Production, is proposed. The process begins with a grinding step, followed by washing with water, which removed the fluxing salts but provoking the hydrolysis of AlN, yielding Al(OH)3 and ammonia. Sieving of the solid g...

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Autores: Jiménez, Alejandro, Rives, Vicente, Vicente, Miguel Ángel, Gil Bravo, Antonio
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Universidad Pública de Navarra
Repositorio:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
OAI Identifier:oai:academica-e.unavarra.es:2454/43773
Acceso en línea:https://hdl.handle.net/2454/43773
Access Level:acceso abierto
Palabra clave:Aluminum saline slags
Industrial waste valorization
High-value-added products
Aluminum extraction
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spelling A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slagsJiménez, AlejandroRives, VicenteVicente, Miguel ÁngelGil Bravo, AntonioAluminum saline slagsIndustrial waste valorizationHigh-value-added productsAluminum extractionA management process for saline slags, one of the wastes from Secondary Aluminum Production, is proposed. The process begins with a grinding step, followed by washing with water, which removed the fluxing salts but provoking the hydrolysis of AlN, yielding Al(OH)3 and ammonia. Sieving of the solid generated an intermediate and a fine fraction. The first one was rich in metallic aluminum, and can also be returned to the Secondary Aluminum Production. The fine fraction was submitted to a extraction process in acid (HCl or HNO3) or alkaline (NaOH, KOH or CsOH) conditions, under reflux at 90 ºC, obtaining an Al(III) solution that can be used in the synthesis of aluminum-based solids. HCl (1-8 mol/L) and NaOH (1-4 mol/L) were used as reference solutions, HNO3, NaOH and KOH were used under specific conditions; the slag fraction:extraction solution solid:liquid ratio was also varied. The optimum extraction conditions were: extraction time 2 h, solid:liquid ratio 3:10, concentration 3 mol/L for the NaOH medium and 4 mol/L for the HCl medium. More than 30% of the aluminum present in the fraction smaller than 0.4 mm was recovered (the remaining aluminum was present as insoluble phases, corundum and spinel). Acid or basic media can be selected depending on the final use of Al(III) solutions, the basic medium leading to an Al(III) solution with a lower amount of impurities. The hazardousness of the solid obtained after the extraction process was greatly decreased, making possible the use of this solid residue in sectors such as construction.This work was supported by 'Memoria de D. Samuel Solórzano Barruso' Foundation (FS/11-2020). AJ thanks Universidad de Salamanca and Banco Santander for a predoctoral contract. AG is grateful for financial support from the Spanish Ministry of Science and Innovation (MCIN/AEI/10.13039/501100011033) through project PID2020-112656RB-C21. AG also thanks Santander Bank for funding via the Research Intensification Program.ElsevierZientziakInstitute for Advanced Materials and Mathematics - INAMAT2Ciencias2022info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/mswordhttps://hdl.handle.net/2454/43773reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarrainstname:Universidad Pública de NavarraInglésinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112656RB-C21© 2022 The Author(s). This is an open access article under the CC BY-NC-ND licensehttps://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:academica-e.unavarra.es:2454/437732026-06-17T12:41:47Z
dc.title.none.fl_str_mv A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags
title A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags
spellingShingle A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags
Jiménez, Alejandro
Aluminum saline slags
Industrial waste valorization
High-value-added products
Aluminum extraction
title_short A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags
title_full A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags
title_fullStr A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags
title_full_unstemmed A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags
title_sort A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags
dc.creator.none.fl_str_mv Jiménez, Alejandro
Rives, Vicente
Vicente, Miguel Ángel
Gil Bravo, Antonio
author Jiménez, Alejandro
author_facet Jiménez, Alejandro
Rives, Vicente
Vicente, Miguel Ángel
Gil Bravo, Antonio
author_role author
author2 Rives, Vicente
Vicente, Miguel Ángel
Gil Bravo, Antonio
author2_role author
author
author
dc.contributor.none.fl_str_mv Zientziak
Institute for Advanced Materials and Mathematics - INAMAT2
Ciencias
dc.subject.none.fl_str_mv Aluminum saline slags
Industrial waste valorization
High-value-added products
Aluminum extraction
topic Aluminum saline slags
Industrial waste valorization
High-value-added products
Aluminum extraction
description A management process for saline slags, one of the wastes from Secondary Aluminum Production, is proposed. The process begins with a grinding step, followed by washing with water, which removed the fluxing salts but provoking the hydrolysis of AlN, yielding Al(OH)3 and ammonia. Sieving of the solid generated an intermediate and a fine fraction. The first one was rich in metallic aluminum, and can also be returned to the Secondary Aluminum Production. The fine fraction was submitted to a extraction process in acid (HCl or HNO3) or alkaline (NaOH, KOH or CsOH) conditions, under reflux at 90 ºC, obtaining an Al(III) solution that can be used in the synthesis of aluminum-based solids. HCl (1-8 mol/L) and NaOH (1-4 mol/L) were used as reference solutions, HNO3, NaOH and KOH were used under specific conditions; the slag fraction:extraction solution solid:liquid ratio was also varied. The optimum extraction conditions were: extraction time 2 h, solid:liquid ratio 3:10, concentration 3 mol/L for the NaOH medium and 4 mol/L for the HCl medium. More than 30% of the aluminum present in the fraction smaller than 0.4 mm was recovered (the remaining aluminum was present as insoluble phases, corundum and spinel). Acid or basic media can be selected depending on the final use of Al(III) solutions, the basic medium leading to an Al(III) solution with a lower amount of impurities. The hazardousness of the solid obtained after the extraction process was greatly decreased, making possible the use of this solid residue in sectors such as construction.
publishDate 2022
dc.date.none.fl_str_mv 2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2454/43773
url https://hdl.handle.net/2454/43773
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112656RB-C21
dc.rights.none.fl_str_mv © 2022 The Author(s). This is an open access article under the CC BY-NC-ND license
https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv © 2022 The Author(s). This is an open access article under the CC BY-NC-ND license
https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
instname:Universidad Pública de Navarra
instname_str Universidad Pública de Navarra
reponame_str Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
collection Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
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