The dissolution kinetics of gibbsite in sodium hydroxide at ambient pressure
Date
2010
Authors
Grenman, H.
Salmi, T.
Murzin, D.Y.
Addai Mensah, J.
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Industrial & Engineering Chemistry Research, 2010; 49(6):2600-2607
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Abstract
The dissolution kinetics of pure gibbsite in concentrated sodium hydroxide solutions was studied. The experiments were performed under ambient pressure and at 60-85 °C. The changes in morphology of the solid phase were studied during the reaction by particle size, porosity, and surface area measurements as well as scanning electron microscopy. Reaction rates were observed to be strongly dependent on temperature and hydroxide concentration. Several kinetic models, based on different representation of the surface area ofgibbsite, were compared to the experimental data and a good correlation between a model incorporatingrough/porous geometry and the experimental data was obtained.
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Copyright 2010 American Chemical Society