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Kinetics of gibbsite leaching in sodium hydroxide aqueous solution

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Author(s): Pavlović Ljubica J. | Aćimović-Pavlović Zagorka | Andrić Ljubiša D. | Prstić Aurel

Journal: Hemijska Industrija
ISSN 0367-598X

Volume: 56;
Issue: 9;
Start page: 381;
Date: 2002;
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Keywords: Gibbsite -y-Al(OH)3 | sodium hydroxide | kinetics | leaching | activation energy

ABSTRACT
In order to study the kinetics and mechanism of the reaction, laboratory leaching was carried out with industrially produced gibbsite γ-Al(OH)3 in aqueous solutions containing an excess of sodium hydroxide. The results obtained reaction temperature, duration and base concentration varied. The basic kinetic parameters were determined from: the reaction rate constant k=8.72·107 exp (-74990/RT) and the process activation energy in the range Ea=72.5-96.81 kJ/mol.
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