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Glass Dissolution and Mineral Precipitation Model

Set the initial fluid composition with Na-HCO3 water at 250°C, adjust glass oxide composition, suppress unlikely minerals, and run the calculation to simulate glass dissolution and altered mineral layer formation.

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Glass Dissolution and Mineral Precipitation Model

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  1. Set the composition of the initial fluid on the Basis pane. pH 7.8 Na-HCO3 water 250 °C

  2. Set the oxide composition of the glass on the Reactants pane. In our model, the glass dissolves completely into solution, then some secondary minerals precipitate as an altered layer. add → Simple → Oxide… SiO2 The oxides alter the composition of the system, but they have no thermodynamic stability.

  3. Suppress minerals that are unlikely to form. Here, we suppress framework silicates, such as feldspars and quartz. Config → Suppress… Run → Go begins the calculation

  4. We assume that boron behaves as a conservative element, so its concentration in solution provides a measure of the amount of glass dissolved. As the glass dissolves, secondary minerals form an altered layer.

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