Diagramas de eslabilidad de zeolitas. I. Zeolitas en ambientes confinados alcalinos
DOI:
https://doi.org/10.3989/egeol.89455-6499Keywords:
zeolites, thermodynamical equilibrium, standard free energies, stability fields, saline alkaline-lake deposits, anaicime, clinoptilolite, chabazite, erionite, mordenite, phillipsiteAbstract
The stability fieds of zeolites in saline alkaline-lake deposits has been studied. Thermodynamical equilibriums were calculed by ussing a method of stimating the Gibbs free energies of formation of zeolites. We have studied the following stability fields:
- Diagram c1inoptilolite-erionite-phillipsite.
- Diagram analcime-clinoptilolite-chabazite-erionite-mordenite-phillipsite.
- Diagram K-feldspar-zeolites in saline alkaline-lake deposits.
The obtained stability diagrams show the influence of silica activity, water activity and alkaline ions activity on equilibrium relationship between analcime and alkalic silicic zeolites, and or feldspar and zeolites. pH influence on the solubility zeolites has been also studied. These results show, at pH below 10, that the most silicic zeolites (clinoptilolite and mordenite) are more stable than low silicic ones (analcime and chabazite). However, at pH above 10, the low silicic zeolites are the most stable phases.
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