Selectively leaching the iron-removed bauxite residues with phosphoric acid for enrichment of rare earth elements

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dc.contributor.authorDeng, Bona
dc.contributor.authorLi, Guanghi
dc.contributor.authorLuo, Jun
dc.contributor.authorYe, Qing
dc.contributor.authorLiu, Mingxia
dc.contributor.authorRao, Mingjun
dc.contributor.authorJiang, Tao
dc.contributor.authorBauman, Lukas
dc.contributor.authorZhao, Boxin
dc.date.accessioned2020-01-05T19:26:43Z
dc.date.available2020-01-05T19:26:43Z
dc.date.issued2019-11-15
dc.descriptionThe final publication is available at Elsevier via https://doi.org/10.1016/j.seppur.2019.115714. © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.description.abstractBauxite residue (BR) is a hazardous industrial waste and also becomes an important reserve of rare earth elements (REE). An elegant process for achieving separation of REEs against silica from an iron-removed BR was established in this paper through selective leaching of silica with simultaneous enrichment of REEs. It was found that the phosphoric acid performed better than other acids (HNO3, HCl) for multiple REEs enrichment. The ideal conditions for the leaching process was determined through response surface methodology (RSM) to be H3PO4 concentration of 1.2 mol/L, L/S ratio of 11 mL/g and leaching temperature of 40 °C. 82.3% SiO2 in iron-removed BR was leached out while the REEs (La2O3, Ce2O3, Sc2O3 and Y2O3) remained in the leached residue with recovery of more than 98%. La2O3 and Ce2O3 were proved to be in lattice replacement within the acid-resistant pervoskite and thus remained in the leached residue. Only part of Sc2O3 and Y2O3 entered into pervoskite and the remainder was trapped in the aluminosilicate minerals. The enrichment of Sc2O3 and Y2O3 in phosphoric acid leaching process was related to the low acidity of H3PO4 solution.en
dc.description.sponsorshipThe authors wish to express their thanks to the National Natural Science Foundation of China (No.51234008 and 51174230) for the financial support of this research. This work was also financially supported by Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources.en
dc.identifier.urihttps://doi.org/10.1016/j.seppur.2019.115714
dc.identifier.urihttp://hdl.handle.net/10012/15393
dc.language.isoenen
dc.publisherElsevieren
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectbauxite residueen
dc.subjectrare earth elementsen
dc.subjectenrichmenten
dc.subjectsilicaen
dc.subjectacid leachingen
dc.titleSelectively leaching the iron-removed bauxite residues with phosphoric acid for enrichment of rare earth elementsen
dc.typeArticleen
dcterms.bibliographicCitationB. Deng, G. Li, J. Luo, Q. Ye, M. Liu, M. Rao, T. Jiang, L. Bauman, B. Zhao, Selectively leaching the iron-removed bauxite residues with phosphoric acid for enrichment of rare earth elements, Separation and Purification Technology (2019), doi: https://doi.org/10.1016/j.seppur.2019.115714en
uws.contributor.affiliation1Faculty of Engineeringen
uws.contributor.affiliation2Chemical Engineeringen
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen
uws.scholarLevelGraduateen
uws.typeOfResourceTexten

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