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New extractants for separation of platinium-group metals from chloride solutions and their application to recycling processes

2012-09-10Conference object Open access
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dc.contributor.authorPaiva, A. P.
dc.contributor.authorCarvalho, G. I.
dc.contributor.authorSchneider, A. L.
dc.contributor.authorCosta, M. Clara
dc.contributor.authorCosta, A. M.
dc.contributor.authorAssunção, A. F.
dc.contributor.authorNogueira, Carlos
dc.date.accessioned2012-10-30T10:58:17Z
dc.date.available2012-10-30T10:58:17Z
dc.date.issued2012-09-10
dc.description.abstractIn this paper some results on the application of four N,N’-tetrasubstituted malonamide derivatives for the extraction and separation of platinum-group metals (PGMs) are presented. The above mentioned extractants were specifically synthesized in order to evaluate their efficiency for the extraction of a specific metal, or group of metals, from aqueous chloride matrices. Different behaviours were obtained towards platinum(IV) and/or palladium(II) extraction, all the N,N’-tetrasubstituted malonamide derivatives allowing the mutual separation of the two metal ions, depending on the HCl concentration. Generally, extraction experiments were carried out involving initial aqueous phases containing 100 mg/L of each metal isolate, in varying 1M to 8M HCl concentration ranges, and 0.05M extractant in 1,2- dichloroethane solutions. From the preliminary results obtained, one can conclude that HCl concentrations and the structure of the malonamide derivative play a crucial role on the efficiency shown for Pt(IV) and/or Pd(II) extraction. The efficiency of the stripping stage of the loaded organic phases is variable, depending on the N,N’-tetrasubstituted malonamide derivative, as well as on the metal ion involved; for Pt(IV), distilled water and 1M HCl were generally successful, whereas for Pd(II), thiourea in HCl gave better results. The overall data already achieved suggest that these extractants may be good candidates for further evaluation in PGMs separations from real solutions resulting from recycling processes.por
dc.identifier.citationPaiva, A. P.; Carvalho, G. I.; Schneider, A. L.; Costa, M. C.; Costa, A. M.; Assunção, A. F.; Nogueira, C. A. New extractants for separation of platinium-group metals from chloride solutions and their application to recycling processes. In: WasteEng’2012: Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation, Porto, 2012, September 10-13, paper 251, 6 p.por
dc.identifier.urihttp://hdl.handle.net/10400.9/1575
dc.language.isoengpor
dc.subjectPlatinum-group metalspor
dc.subjectMalonamide extractantspor
dc.subjectChloride solutionspor
dc.subjectRecyclingpor
dc.titleNew extractants for separation of platinium-group metals from chloride solutions and their application to recycling processespor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlacePortopor
oaire.citation.titleWasteEng’2012: Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisationpor
person.familyNamePaiva
person.familyNameNogueira
person.givenNameAna Paula
person.givenNameCarlos
person.identifier.ciencia-idAB1D-468B-F3E9
person.identifier.ciencia-id011E-FCCD-4FA6
person.identifier.orcid0000-0003-3858-9386
person.identifier.orcid0000-0003-2949-5046
person.identifier.ridA-2064-2008
person.identifier.ridA-4926-2013
person.identifier.scopus-author-id7102683760
person.identifier.scopus-author-id7006686159
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
relation.isAuthorOfPublicationf31cb44a-7501-4c39-835b-e86aeb4b63a9
relation.isAuthorOfPublicationb4222458-c0fc-4926-9d9a-e3cf9ae1e7e3
relation.isAuthorOfPublication.latestForDiscoveryf31cb44a-7501-4c39-835b-e86aeb4b63a9

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