This is one of six different example models (all developed by Ted Eary of Enchemica) that illustrate how GoldSim can be used to carry out mixing and geochemical calculations. The models proceed from the simplest to the most complex. You can see an overview of all six models here.
This model illustrates an approach for calculating the solubility an an element based on equilibrium chemistry that includes solid phase dissolution-precipitation and aqueous speciation similar in concept to a thermodynamically based geochemical model. That is, the geochemical equilibria equations are represented and solved directly in GoldSim (this is practical in this example due to the relative chemical simplicity of the system being modeled). In particular, the mineral gibbsite, Al(OH)3, is used for the solid phase and dissolved Al-hydroxyl and Al-sulfate species are used to represent the aqueous speciation. The results are presented as a solubility curve of dissolved aluminum as a function of pH.
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