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Fluid 1: High Ba ++ , low SO 4 −−

Fluid 1: High Ba ++ , low SO 4 −−. Add new species. Specify fluid composition and T on the Basis pane. Run → Go equilibrates the fluid. Run → Pickup → Reactants → Fluid moves the equilibrated fluid to the Reactants pane and vacates the Basis pane.

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Fluid 1: High Ba ++ , low SO 4 −−

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  1. Fluid 1: High Ba++, low SO4−− Add new species Specify fluid composition and T on the Basispane Run → Goequilibrates the fluid

  2. Run → Pickup → Reactants → Fluid moves the equilibrated fluid to the Reactantspane and vacates the Basis pane The Ba++-rich fluid can now be mixed with a new fluid.

  3. Fluid 2: Low Ba++, high SO4−− Specify second fluid composition on the Basispane

  4. Go to Config→ Stepping to implement a flash model. A flash model mixes two fluids in every possible mixing fraction. flash → fluid Run → Go mixes the fluids

  5. Barite does not precipitate from either end-member fluid, but forms extensively in mixture Fluid 2: Low Ba++, high SO4−− Fluid 1: High Ba++, low SO4−−

  6. Go to Config→ Iteration to disable mineral precipitation. Uncheck “precipitation” Run → Go mixes the fluids

  7. Component concentrations demonstrate (semi)conservative mixing behavior when precipitation is disabled. Fluid 2: Low Ba++, high SO4−− Fluid 1: High Ba++, low SO4−−

  8. Barite is undersaturated in end-member fluids, oversaturated in mixture. Fluid 2: Low Ba++, high SO4−− Fluid 1: High Ba++, low SO4−−

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