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

dc.contributor.authorJiménez, Alejandro
dc.contributor.authorRives, Vicente
dc.contributor.authorVicente, Miguel Ángel
dc.contributor.authorGil Bravo, Antonio
dc.contributor.departmentZientziakeu
dc.contributor.departmentInstitute for Advanced Materials and Mathematics - INAMAT2en
dc.contributor.departmentCienciases_ES
dc.date.accessioned2022-08-17T10:54:34Z
dc.date.available2022-08-17T10:54:34Z
dc.date.issued2022
dc.date.updated2022-08-17T10:38:45Z
dc.description.abstractA 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.en
dc.description.sponsorshipThis 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.en
dc.format.mimetypeapplication/pdfen
dc.format.mimetypeapplication/msworden
dc.identifier.citationJiménez, A., Rives, V., Vicente, M.A., Gil, A.. (2022). A comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slags. Journal of Environmental Chemical Engineering . 10,3 .en
dc.identifier.doi10.1016/j.jece.2022.107546
dc.identifier.issn2213-3437
dc.identifier.urihttps://academica-e.unavarra.es/handle/2454/43773
dc.language.isoengen
dc.publisherElsevieren
dc.relation.ispartofJournal of Environmental Chemical Engineering, 2022, 10 (3)en
dc.relation.projectIDinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112656RB-C21/ES/en
dc.relation.publisherversionhttps://doi.org/10.1016/j.jece.2022.107546
dc.rights© 2022 The Author(s). This is an open access article under the CC BY-NC-ND licenseen
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAluminum saline slagsen
dc.subjectIndustrial waste valorizationen
dc.subjectHigh-value-added productsen
dc.subjectAluminum extractionen
dc.titleA comparative study of acid and alkaline aluminum extraction valorization procedure for aluminum saline slagsen
dc.typeinfo:eu-repo/semantics/article
dc.type.versionVersión publicada / Argitaratu den bertsioaes
dc.type.versioninfo:eu-repo/semantics/publishedVersionen
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relation.isAuthorOfPublicationcd12e590-cb42-47d5-a642-f60eeee624ec
relation.isAuthorOfPublication.latestForDiscoverycd12e590-cb42-47d5-a642-f60eeee624ec

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