Thermal Behavior of Pyrophyllite Ore during Calcination for Thermal Activation for Aluminum Extraction by Acid Leaching

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dc.authoridErdemoğlu, Murat/0000-0003-2922-7965;
dc.authorwosidErdemoğlu, Murat/AAA-9964-2020
dc.authorwosidUYSAL, TURAN/AAM-1634-2021
dc.contributor.authorErdemoglu, Murat
dc.contributor.authorBirinci, Mustaea
dc.contributor.authorUysal, Turan
dc.date.accessioned2024-08-04T20:47:15Z
dc.date.available2024-08-04T20:47:15Z
dc.date.issued2020
dc.departmentİnönü Üniversitesien_US
dc.description.abstractIn the production of alumina (Al2O3) from clays by acid leaching, thermal activation by calcination is applied widely as a pre-treatment to improve the dissolution of aluminum. Previous studies have focused only on the thermal behavior of high-purity kaolinite and pyrophyllite, individually. However, thermal activation of complex clay ores containing several silicate minerals and their effect on aluminum extraction have not been studied. The purpose of the present study was to characterize the thermal behavior of a clay ore containing mainly pyrophyllite (Al2Si4O10(OH)(2)), kaolinite (Al2Si2O5(OH)(4)), muscovite (KAl2(AlSi3O10)(OH)(2)), quartz (SiO2), and kyanite (Al2SiO5) from the Puturge clay deposits (Malatya, Turkey) for possible use in alumina (Al2O3) production by acid leaching. The ore and its calcination products obtained at various temperatures were characterized with respect to their mineral paragenesis, crystal structure, surface morphology, and thermal, calorimetric, and aluminum dissolution properties in order to understand the changes that occurred. Aluminum recovery in the leach solution increased in direct proportion to the dehydroxylation degree (D-tg) of the ore as the calcination temperature increased to 900 degrees C. A maximum aluminum extraction of 90.57% was achieved by leaching of the product from calcination at 900 degrees C. Aluminum extraction decreased sharply above that temperature, even though D-tg increased a little. By increasing the calcination temperature; the structures of pyrophyllite, kaolinite, and muscovite were destroyed by dehydroxylation, resulting in the exfoliation of the mineral layers, thus, a mixture of dehydroxylated phases formed. Depending mainly on the temperature range at which each of the dehydroxylated phases is durable, aluminum could be leached to some extent. The sharp decrease in the extraction of aluminum, iron, and potassium at higher temperatures was attributed to compaction of previously exfoliated layers of the minerals through re-crystallization to form mullite-like structures which seemed insensitive to acid attack during the leaching.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [214M432]; Inonu University Scientific Research Project Unit [2015/44G]en_US
dc.description.sponsorshipThe authors thank the Scientific and Technological Research Council of Turkey (TUBITAK) for financially supporting this study via Project No 214M432, Inonu University Scientific Research Project Unit for supporting the study through Project No 2015/44G, Cimsa Cement Inc. (Enis Solakoglu, Tughan Delibas, and Melike Sucu), and Icel Mining Inc. (Ibrahim Altuntas and Nihat Akkaya), for providing pyrophyllite ore samples from Puturge (Malatya, Turkey). The support of Prof. Dr. Omer Bozkaya (Department ofGeological Engineering, PamukkaleUniversity, Turkey) is also acknowledged gratefully.en_US
dc.identifier.doi10.1007/s42860-019-00061-w
dc.identifier.endpage99en_US
dc.identifier.issn0009-8604
dc.identifier.issn1552-8367
dc.identifier.issue2en_US
dc.identifier.scopus2-s2.0-85083792600en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage89en_US
dc.identifier.urihttps://doi.org/10.1007/s42860-019-00061-w
dc.identifier.urihttps://hdl.handle.net/11616/99262
dc.identifier.volume68en_US
dc.identifier.wosWOS:000526572800001en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofClays and Clay Mineralsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAcidic Leachingen_US
dc.subjectAluminaen_US
dc.subjectCalcinationen_US
dc.subjectPyrophyllite Oreen_US
dc.subjectThermal Transformationsen_US
dc.titleThermal Behavior of Pyrophyllite Ore during Calcination for Thermal Activation for Aluminum Extraction by Acid Leachingen_US
dc.typeArticleen_US

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