Evaporation Process of Seawater and Mineral Precipitation
Explore the evaporation process of seawater and mineral precipitation using thermo dataset with Pitzer equations. Set up titration paths, simulate mineral fractionation, and observe which minerals precipitate and dissolve during the evaporation process.
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Presentation Transcript
Halite 10 Bischofite Epsomite Kainite Minerals (cm3) 1 Gypsum Carnallite Kieserite .1 Bloedite Anhydrite Glauberite Dolomite Magnesite Polyhalite .01 .001 1000 100 10 1 .1 Mass H2O (g)
When dealing with concentrated fluids, its a good idea to use a thermo dataset utilizing the Pitzer equations. File Open Thermo Data thermo_hmw.tdat is the Harvie-Moller- Weare formalism of the Pitzer equations.
Set the composition of the initial fluid on the Basis pane. 1 kg solvent water plus solutes define seawater Initial fluid is equilibrated with CO2 in the atmosphere
Set up a titration path on the Reactants pane. Simulate evaporation by removing solvent water from the system (react a negative mass) add Simple Aqueous H2O
Minerals precipitate and dissolve during the evaporation of seawater.
Repeat assuming fractionation of the precipitated minerals Config Stepping Flow-through option doesn t allow precipitated minerals to dissolve back into the fluid
Minerals that precipitate are not allowed to dissolve back into the evaporating seawater.
