Leaching behaviour of high surface area synthetic boehmite in NaOH solution

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dc.contributor.author Alex, T. C.
dc.contributor.author Kumar, Rakesh
dc.contributor.author Roy, S. K.
dc.contributor.author Mehrotra, S. P.
dc.date.accessioned 2014-03-16T15:20:05Z
dc.date.available 2014-03-16T15:20:05Z
dc.date.issued 2013-05
dc.identifier.citation Alex, T. C.; Kumar, Rakesh; Roy, S. K. and Mehrotra, S. P., “Leaching behaviour of high surface area synthetic boehmite in NaOH solution”, Hydrometallurgy, DOI: 10.1016/j.hydromet.2013.04.004, vol. 137, pp. 23-32, May 2013. en_US
dc.identifier.issn 0304-386X
dc.identifier.uri http://dx.doi.org/10.1016/j.hydromet.2013.04.004
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/814
dc.description.abstract This study pertains to alkali leaching of a high surface area synthetic boehmite prepared by thermal decomposition of gibbsite. Synthesised boehmite particles are found to be agglomerates of platelets. These particles are characterised by a monomodal size distribution with a median size of 110 μm and high specific surface area (~ 264 m2/g). Leaching studies, in the temperature range 70 to 90 °C, have been carried out in NaOH solutions of Na2O concentration, CNa2O = 100 and 180 g/l. Significant dissolution of this boehmite is seen to occur in NaOH solutions, unlike in many other studies, owing to the high surface area. Both alkali concentration and temperature have influenced the dissolution. Reduced time plot analysis indicates that the shrinking core with surface reaction model (R3) describes the initial stages of the dissolution process reasonably well. Particle size analysis data complemented the results of the reduced time analysis. The value of apparent activation energy for the initial stages of dissolution is evaluated to be around 65 kJ/mol. Deviation from shrinking core model R3 is observed in the later stages. Besides the shrinking of size due to dissolution, particle size reduction is also identified due to the detachment of platelets from the agglomerates of particles. Detailed characterisation of the leach residues involving morphological and particle size analyses has established such detachment of platelets and ensuing particle size reduction. Deviation from shrinking core model in the later stages of leaching has been attributed to particle fragmentation arising from platelet separation. en_US
dc.description.statementofresponsibility by S. P. Mehrotra et al.,
dc.description.statementofresponsibility by S.P. Mehrotra et al.,
dc.format.extent Vol. 137, pp. 23-32
dc.format.extent Vol. 144–145, pp. 99–106
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Boehmite en_US
dc.subject Leaching en_US
dc.subject Kinetic analysis en_US
dc.subject Reduced time plot en_US
dc.subject Shrinking core model en_US
dc.title Leaching behaviour of high surface area synthetic boehmite in NaOH solution en_US
dc.type Article en_US
dc.relation.journal Hydrometallurgy


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