Experimental study of the effect of pH and temperature on the kinetics of montmorillonite dissolution |
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| Authors: | Marisa Rozalen F. Javier Huertas |
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| Affiliation: | a Estación Experimental del Zaidín - CSIC, Department of Environmental Geochemistry, Profesor Albareda 1, 18008 Granada, Spain
b Sandia National Laboratories, Albuquerque, NM 87185-0754, USA |
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| Abstract: | The effect of pH on the kinetics of smectite (K-montmorillonite) dissolution was investigated at 50 and 70 °C in stirred flow-through reactors over the pH range of 1-13.5. Experiments done at very acidic and very basic pH were far from equilibrium. Near neutral pH experiments were closer to equilibrium. The Al/Si release ratio, while initially being incongruent, ultimately approached the stoichiometric value in most of the experiments. Temperature, extreme pH, and time favor congruency. Rates can be described by: |
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