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Kinetics of boehmite precipitation from supersaturated sodium aluminate solutions

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dc.contributor.author Skoufadis, C en
dc.contributor.author Panias, D en
dc.contributor.author Paspaliaris, I en
dc.date.accessioned 2014-03-01T01:19:05Z
dc.date.available 2014-03-01T01:19:05Z
dc.date.issued 2003 en
dc.identifier.issn 0304-386X en
dc.identifier.uri http://hdl.handle.net/123456789/15373
dc.subject Aluminate solutions en
dc.subject Boehmite precipitation en
dc.subject Kinetics en
dc.subject.classification Metallurgy & Metallurgical Engineering en
dc.subject.other Activation energy en
dc.subject.other Alumina en
dc.subject.other Bauxite ore treatment en
dc.subject.other Hydrolysis en
dc.subject.other Precipitation (chemical) en
dc.subject.other Reaction kinetics en
dc.subject.other Solubility en
dc.subject.other Solutions en
dc.subject.other Supersaturation en
dc.subject.other Seed ratio (SR) en
dc.subject.other Aluminum metallurgy en
dc.title Kinetics of boehmite precipitation from supersaturated sodium aluminate solutions en
heal.type journalArticle en
heal.identifier.primary 10.1016/S0304-386X(02)00165-2 en
heal.identifier.secondary http://dx.doi.org/10.1016/S0304-386X(02)00165-2 en
heal.language English en
heal.publicationDate 2003 en
heal.abstract This work presents the effect of the most important parameters, the precipitation temperature, the sodium hydroxide concentration and the initial seed ratio (SR) in the solution, on the boehmite precipitation from supersaturated sodium aluminate solutions. A kinetic model that describes the experimental data was developed. According to that model, boehmite precipitation follows second order reaction kinetics and has activation energy of 89 kJ/mol. The orders of the precipitation reaction with respect to the initial sodium hydroxide concentration and the initial seed ratio are estimated to be - 1.8 and 0.54, respectively. The most important result is that the boehmite precipitation reaches an apparent equilibrium stage at which the alumina concentration is much higher compared to the value of the boehmite solubility under the same experimental conditions. The results reveal that the boehmite precipitation is a self-decelerated process and the observed kinetic inhibitions are related to the sodium hydroxide concentration in the supersaturated solution. Finally, a mechanistic interpretation of the experimental data is presented based on the concept of the surface precipitation of boehmite on the active sites of the boehmite seed. (C) 2003 Elsevier Science B.V. All rights reserved. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName Hydrometallurgy en
dc.identifier.doi 10.1016/S0304-386X(02)00165-2 en
dc.identifier.isi ISI:000181303500009 en
dc.identifier.volume 68 en
dc.identifier.issue 1-3 en
dc.identifier.spage 57 en
dc.identifier.epage 68 en


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