Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/15586
DC FieldValueLanguage
dc.contributor.authorRasteiro, M.G.-
dc.contributor.authorGarcia, F.A.P.-
dc.contributor.authorFerreira, P.-
dc.contributor.authorBlanco, A.-
dc.contributor.authorNegro, C.-
dc.contributor.authorAntunes, E.-
dc.date.accessioned2011-07-27T15:49:57Z-
dc.date.issued2007-05-06-
dc.identifier.issn0255-2701-
dc.identifier.urihttp://hdl.handle.net/10316/15586-
dc.description.abstractFlocculation studies of precipitated calcium carbonate induced by cationic polyacrylamides (C-PAMs) were carried out using light diffraction scattering (LDS). The effect of both polymer charge density and concentration on the flocculation process and on flocs density was investigated. As expected, results show that high charge density C-PAM induces flocculation by bridging and patching mechanisms simultaneously, while medium charge density C-PAM acts mainly according to the bridging mechanism. Consequently, the mass fractal dimensions of the flocs produced by high charge density C-PAM are higher. Results also show the effect of flocculant concentration: flocculation rate decreases and denser flocs are obtained as flocculant concentration increases. The results obtained so far allowed a preliminary quantitative evaluation of flocculation kinetics. In the flocculation curve, two regions corresponding to different kinetics were identified: a first region dominated by particle aggregation and a second region dominated by flocs stabilization. Therefore, LDS is considered a useful tool to evaluate flocculants performance. A strategy was developed that resulted in the use of LDS to retrieve, in a single test, information on the evolution with time of flocs dimension and structure, flocs resistance and flocculation kinetics. All the tests were performed under turbulent conditions similar to the ones prevailing in process equipment.por
dc.language.isoengpor
dc.publisherElsevierpor
dc.rightsopenAccesspor
dc.subjectFlocculation mechanismspor
dc.subjectLaser diffraction spectroscopypor
dc.subjectLDSpor
dc.subjectCharge densitypor
dc.subjectMass fractal dimensionpor
dc.subjectFloc structurepor
dc.titleThe use of LDS as a tool to evaluate flocculation mechanismspor
dc.typearticlepor
degois.publication.firstPage1323por
degois.publication.lastPage1332por
degois.publication.issue8por
degois.publication.titleChemical Engineering and Processingpor
dc.relation.publisherversiondoi:10.1016/j.cep.2007.04.009por
dc.peerreviewedYespor
dc.identifier.doi10.1016/j.cep.2007.04.009-
degois.publication.volume47por
item.languageiso639-1en-
item.grantfulltextopen-
item.fulltextCom Texto completo-
crisitem.author.deptFaculdade de Ciências e Tecnologia, Universidade de Coimbra-
crisitem.author.parentdeptUniversidade de Coimbra-
crisitem.author.researchunitResearch Center for Chemical Processes and Forest Products-
crisitem.author.orcid0000-0002-4503-6811-
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais
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