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  1. Hi to all, I would like to ask you for some advices in choosing the right reaction paths models in REACT. I'd like to calculate a mixing model of (1) hot metal-bearing fluid (small volume, low pH, supersaturated with some mineral phase) with a (2) cold, almost pure fluid (high pH, high volume). I want to find out the amount of metals that can be removed and precipitated as minerals from hot fluids (should be mainly due to changes in T and pH) when it starts to mix with the cold fluid. I want neglect any supersaturated minerals that might be present in the initial fluids. Once the minerals precipitated as a result of the mixing of the fluids, they should be prevented from re-dissolving into the liquida at any further step of the fluid mixing. In REACT I played around with the "flow-through" and "flash" models (with "dump" option on). The results of both look quite different. Could you please give a recommendation, which model might be the best in order to describe the mineral precipitation from one fluid as a result of the 2-fluid mixing. Many thanks in advance, Sebastian
  2. I apologize in advance: I am far from familiar with GWB. The mix I'm trying to model is supersaturated in several Ca phosphate phases. Fluid A & B seem to equilibrate ok independently, but using pickup>reactants>Fluid A to react with Fluid B is not working for me. The popup-error seems to suggest the components need to be the same on both solutions -not sure if this is the case-. Modeling the solution as a single event is confusing because it looks like I can't choose CO3--, CH3COOH- and H+ simultaneously. (I am also confused by the requirement of equilibration with O2 for only 1 of the 2 fluids above.) Loading the fluid scripts one after the other and then running the equilibration, produces results albeit including several warnings of charge imbalance (which I expect) and the elimination of CO3-- from the basis; I am not sure this represents the mix I want. I haven't considered modifications to the default activities calculation, but this may be important for this example. Input is appreciated! MC FluidA.rea FluidB.rea
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