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Dissolution of aluminium from metakaolin with oxalic, citric and lactic acids

Published online by Cambridge University Press:  27 May 2019

Danyal Karbalaei Saleh ,
Hadi Abdollahi Open the ORCID record for Hadi Abdollahi [Opens in a new window] ,
Mohammad Noaparast  and
Alireza Fallah Nosratabad
Danyal Karbalaei Saleh
Affiliation:
School of Mining Engineering, College of Engineering, University of Tehran, PO Box 1439957131, Tehran 1417466191, Iran
Hadi Abdollahi*
Affiliation:
School of Mining Engineering, College of Engineering, University of Tehran, PO Box 1439957131, Tehran 1417466191, Iran
Mohammad Noaparast
Affiliation:
School of Mining Engineering, College of Engineering, University of Tehran, PO Box 1439957131, Tehran 1417466191, Iran
Alireza Fallah Nosratabad
Affiliation:
Soil and Water Research Institute, The Research, Education and Agricultural Extension (AREEO), PO Box 31785-311, Karaj 31779-93545, Iran
*
*E-mail: [email protected]
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Abstract

This study examines the leaching of aluminium from calcined kaolin (metakaolin) with citric, oxalic and lactic acid and binary combinations of these organic acids. The investigated parameters were the pulp density, acid concentration, pH, agitation speed, temperature and contact time. The kinetics of aluminium dissolution from metakaolin in binary organic acid mixtures were determined and scanning electron microscopy examination and energy-dispersive spectrometry mapping of Si and Al of untreated kaolin and residual solids were also carried out. Aluminium dissolution increased with temperature, time, acid concentration, pulp density and acidity. At maximum dissolution, citric–oxalic (1:4 w/w) and lactic–oxalic (1:4 w/w) mixtures dissolved 77% and 78% aluminium, respectively, from metakaolin in 11 h. The activation energy ranged from 57.8 to 74.6 kJ/mol. The most effective parameter in the dissolution of aluminium was the temperature, indicating that the reaction was not diffusion-controlled. It was concluded on the basis of the activation energy values and the sensitivity of the reaction to temperature that the dissolution was under chemical-reaction control.

Keywords

aluminium dissolutionleaching kineticsmetakaolinorganic acids
Type
Article
Information
Clay Minerals , Volume 54 , Issue 2 , June 2019 , pp. 209 - 217
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Joao Labrincha

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