Recovery of thorium and rare earth elements from sludge with the aid of anionic exchanger

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dc.contributor.authorABRAO, ALCIDIOpt_BR
dc.contributor.authorFERREIRA, JOAO C.pt_BR
dc.contributor.authorSALVADOR, VERA L.R.pt_BR
dc.contributor.authorZINI, JOSIANEpt_BR
dc.contributor.authorCARVALHO, FATIMA M.S. dept_BR
dc.coverageNacionalpt_BR
dc.creator.eventoCONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 17.pt_BR
dc.date.accessioned2014-11-19T10:53:31Zpt_BR
dc.date.accessioned2014-11-19T14:07:37Zpt_BR
dc.date.accessioned2015-04-01T12:47:49Z
dc.date.available2014-11-19T10:53:31Zpt_BR
dc.date.available2014-11-19T14:07:37Zpt_BR
dc.date.available2015-04-01T12:47:49Z
dc.date.evento15-19 de novembro, 2006pt_BR
dc.description.abstractAbstract During operation of a solvent extraction pilot plant for preparation of pure thorium nitrate, a thorium concentrate produced industrially from monazite processing in São Paulo containing the REE as main impurities and some minor elements like iron, titanium, lead, sodium and silica was dissolved with hot nitric acid following by digestion and addition of flocculants was filtered for the separation of some insoluble fraction. Thorium was extracted with TBP-diluent in a pulsed column. Small amount of this thorium nitrate was used for nuclear research and the gross production was supplied to some companies that manufacture thorium gas light mantle in Brazil. The raffinate still containing some thorium and the totality of REE was treated with sodium hydroxide and the hydroxides as sludge are stocked. Nowadays there is a stockpile of circa 25 ton of the mentioned material. In this work it is reported a process for separation of thorium from rare earth elements (REE) and their recovery from this accumulated sludge. It is dissolved with hot nitric acid, filtered to separate any insoluble and an excess of acid is added. The prepared solution is fed into a strong anion ion exchanger previously treated with 1mol L-1 HNO3. Thorium nitrate as an anionic complex is retained while REE and other impurities are passed to the effluent. This effluent is treated to obtain a rare earth concentrate for future work of individual separation of the elements. The resin could retain only very small amounts of cerium and lanthanum, but both are excluded when the column is saturated with thorium. Thorium nitrate is eluted with diluted nitric acid. The process is operationally simple and was developed and successfully performed keeping in mind a future installation for the recovery of thorium and rare earths from the above mentioned sludge.
dc.event.siglaCBECIMATpt_BR
dc.format.extent7577pt_BR
dc.identifier.citationABRAO, ALCIDIO; FERREIRA, JOAO C.; SALVADOR, VERA L.R.; ZINI, JOSIANE; CARVALHO, FATIMA M.S. de. Recovery of thorium and rare earth elements from sludge with the aid of anionic exchanger. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 17., 15-19 de novembro, 2006, Foz do Iguaçu, PR. <b>Resumos...</b> p. 7577. Disponível em: http://repositorio.ipen.br/handle/123456789/20072.
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/20072pt_BR
dc.local.eventoFoz do Iguaçu, PRpt_BR
dc.rightsopenAccesspt_BR
dc.subjectrare earthspt_BR
dc.subjectthoriumpt_BR
dc.subjectmaterials recoverypt_BR
dc.subjectsludgespt_BR
dc.subjectanionspt_BR
dc.subjection exchangept_BR
dc.titleRecovery of thorium and rare earth elements from sludge with the aid of anionic exchangerpt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorJOSIANE ZINI
ipen.autorFATIMA MARIA SEQUEIRA DE CARVALHO
ipen.autorVERA LUCIA RIBEIRO SALVADOR
ipen.autorJOAO COUTINHO FERREIRA
ipen.autorALCIDIO ABRAO
ipen.codigoautor3520
ipen.codigoautor1193
ipen.codigoautor278
ipen.codigoautor489
ipen.codigoautor596
ipen.contributor.ipenauthorJOSIANE ZINI
ipen.contributor.ipenauthorFATIMA MARIA SEQUEIRA DE CARVALHO
ipen.contributor.ipenauthorVERA LUCIA RIBEIRO SALVADOR
ipen.contributor.ipenauthorJOAO COUTINHO FERREIRA
ipen.contributor.ipenauthorALCIDIO ABRAO
ipen.date.recebimento08-05pt_BR
ipen.event.datapadronizada2006pt_BR
ipen.identifier.ipendoc12608pt_BR
ipen.notas.internasResumospt_BR
ipen.type.genreResumo
relation.isAuthorOfPublication0b0be9ac-b8c8-44d0-b128-4d4c7bc04a0d
relation.isAuthorOfPublication967c0ebb-ab49-4443-af6a-7ad7f2350f0c
relation.isAuthorOfPublicationa87fbd98-7e35-46fe-8f05-c94527949b57
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relation.isAuthorOfPublication2d55ca6f-adb8-4016-be6c-312d216f5914
relation.isAuthorOfPublication.latestForDiscovery2d55ca6f-adb8-4016-be6c-312d216f5914
sigepi.autor.atividadeABRAO, ALCIDIO:596:39:Spt_BR
sigepi.autor.atividadeFERREIRA, JOAO C.:489:33:Npt_BR
sigepi.autor.atividadeSALVADOR, VERA L.R.:278:38:Npt_BR
sigepi.autor.atividadeZINI, JOSIANE:3520:-1:Npt_BR
sigepi.autor.atividadeCARVALHO, FATIMA M.S. de:1193:33:Npt_BR
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