Dissolution kinetics of probertite in boric acid solution

Probertite (NaCaB 5O 9·5H 2O) and ulexite (NaCaB 5O 9·8H 2O) posses identical chemical formula except for their water content. In this study, the dissolution of probertite in boric acid solution was investigated as a function of temperature and time. As the boric acid concentration increased, the di...

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Bibliographic Details
Published in:International journal of mineral processing 2009-02, Vol.90 (1), p.16-20
Main Authors: Mergen, A., Demirhan, M.H.
Format: Article
Language:English
Subjects:
Boric acid
Boron
Dissolution kinetic
Probertite
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Summary:Probertite (NaCaB 5O 9·5H 2O) and ulexite (NaCaB 5O 9·8H 2O) posses identical chemical formula except for their water content. In this study, the dissolution of probertite in boric acid solution was investigated as a function of temperature and time. As the boric acid concentration increased, the dissolution of probertite also increased. However, the boric acid concentrations above 5 wt.% at 60 °C and 80 °C did not significantly affect the dissolution of probertite. The stirring speed had almost no effect on the dissolution of probertite. The dissolution kinetics of probertite in boric acid solution was controlled by first order pseudo homogeneous reaction. The activation energies for different probertite particle sizes varied from 25.25 kJ/mol K to 28.25 kJ/mol K, indicating that particle size had minor effect on the dissolution of probertite.
ISSN:0301-7516
1879-3525
DOI:10.1016/j.minpro.2008.09.004