Preparation of highly pure thorium nitrate via thorium sulfate and thorium peroxide

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dc.contributor.authorABRAO, A.pt_BR
dc.contributor.authorFREITAS, A.A.pt_BR
dc.contributor.authorCARVALHO, F.M.S.pt_BR
dc.coverageInternacionalpt_BR
dc.creator.eventoINTERNATIONAL CONFERENCE ON F-ELEMENTS, 4thpt_BR
dc.date.accessioned2014-11-17T17:49:24Zpt_BR
dc.date.accessioned2014-11-18T18:01:30Zpt_BR
dc.date.accessioned2015-04-02T06:01:39Z
dc.date.available2014-11-17T17:49:24Zpt_BR
dc.date.available2014-11-18T18:01:30Zpt_BR
dc.date.available2015-04-02T06:01:39Z
dc.date.eventoSept. 17-21, 2000pt_BR
dc.description.abstractA simple alternative and selective method has been proposed for the preparation of thorium nitrate using as raw material a hydrated crystalline technical grade thorium sulfate. This salt was produced industrially [1] from the alkaline chemical processing of monazite sand in S. Paulo. From a crude thorium hydroxide as the raw material containing uranium and rare earth elements was prepared a technical grade thorium sulfate [Th(SO ) .9H O]. A typical analysis of this salt had shown the following composition: ThO 47–53%, R O (rare 42 2 2 23 earth oxides) 0.5–0.9%, and UO 0.01% and minor amounts of iron, titanium, phosphorus, and silicon oxides. The thorium sulfate is 3 dissolved into water and the thorium peroxide is precipitated from acidic medium by addition of hydrogen peroxide. The thorium peroxide is filtered, washed and finally dissolved with nitric acid. Samples of the thorium peroxide were dried and fired to ThO and aliquot of the 2 thorium nitrate solution was evaporated to dryness and calcined to obtain the ThO . Both ThO have high purity (.99.5%). The content 2 2 of total rare earth elements is very low (0.23% as oxide). Uranium was not detected. The great majority of the RE is precipitated and recovered from the filtrate by oxalic acid.
dc.event.siglaICFE,4pt_BR
dc.identifier.citationABRAO, A.; FREITAS, A.A.; CARVALHO, F.M.S. Preparation of highly pure thorium nitrate via thorium sulfate and thorium peroxide. In: INTERNATIONAL CONFERENCE ON F-ELEMENTS, 4th, Sept. 17-21, 2000, Madrid, Spain. <b>Proceedings...</b> DOI: <a href="https://dx.doi.org/10.1016/S0925-8388(01)00998-7">10.1016/S0925-8388(01)00998-7</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/15197.
dc.identifier.doi10.1016/S0925-8388(01)00998-7
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/15197pt_BR
dc.local.eventoMadrid, Spainpt_BR
dc.rightsopenAccesspt_BR
dc.rightsopenAccess
dc.sourcePublicado em: J. Alloys Compd., v. 323/324, p. 53-56, July 2001pt_BR
dc.subjectthorium nitratespt_BR
dc.subjectchemical preparationpt_BR
dc.subjectthorium sulfatespt_BR
dc.subjectperoxidespt_BR
dc.subjectthorium compoundspt_BR
dc.subjectprecipitationpt_BR
dc.subjectrare earthspt_BR
dc.titlePreparation of highly pure thorium nitrate via thorium sulfate and thorium peroxidept_BR
dc.typeTexto completo de eventopt_BR
dspace.entity.typePublication
ipen.autorF.M.S. CARVALHO
ipen.autorANTONIO ALVES DE FREITAS
ipen.autorALCIDIO ABRAO
ipen.codigoautor9097
ipen.codigoautor1354
ipen.codigoautor596
ipen.contributor.ipenauthorF.M.S. CARVALHO
ipen.contributor.ipenauthorANTONIO ALVES DE FREITAS
ipen.contributor.ipenauthorALCIDIO ABRAO
ipen.date.recebimento02-08pt_BR
ipen.event.datapadronizada2000pt_BR
ipen.identifier.ipendoc08294pt_BR
ipen.notas.internasProceedingspt_BR
ipen.type.genreArtigo
relation.isAuthorOfPublication05ac0a39-2dbc-49f6-a444-63be321221f8
relation.isAuthorOfPublication2fe8a40b-5035-40fb-904e-dfd9c00422df
relation.isAuthorOfPublication2d55ca6f-adb8-4016-be6c-312d216f5914
relation.isAuthorOfPublication.latestForDiscovery2d55ca6f-adb8-4016-be6c-312d216f5914
sigepi.autor.atividadeABRAO, A.:596:-1:Spt_BR
sigepi.autor.atividadeFREITAS, A.A.:1354:-1:Npt_BR
sigepi.autor.atividadeCARVALHO, F.M.S.:9097:-1:Npt_BR
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