geominer

Is MINTEQA2 V4.x database available for use in GWB directly? If not, is there a straightforward process to convert the database for use in GWB? Thanks

In a case where lime, Ca(OH)2, is used to control pH, do I still have to use Cl- in initial system constraints in X1t? In this scenario, a fixed amount of lime is added to the medium initially and more is added if pH falls lower than a target value. For example, initial lime amount = 0.5 g/kg, in a volume of 40 liters of the medium (column) and the target pH = 10.5. The target pH is not always strictly met. Can I directly model the use of lime as pH control in this case? If not, then how would I determine the equivalent Cl- to use in the model?

I want to be able to specify directly the concentrations for the species I am dealing with in Act2, rather than having to calculate activity to input into the UX. IS this possible? If not, is there a simple tool available to do these conversions? Thanks

I was able to follow the direction in Brian's response to add H2 to a copy of the minteq database. I am able to see the water lines now in pe-pH chart. The one piece I left unresolved is k values for the gas entry, H2(g) = H2(aq), at some of the intermediate temperatures, e.g. 12.5 C, 60 C etc. because I was not sure what reaction would work in this case. But I only need 25 C so I am not too worried about it.

I have the same error message: "Reaction for H2(g) is missing; can not plot water limit" when trying to use Act2. This happens on all cases I have tried, including the youtube example of selenium. I am using the thermo_minteq database. But I cannot find any appendix referred to in the reply above. I don't see any Appendix at all in the Reference manual. What is the recommended procedure for adding the reaction of H2(g) to theormo_minteq.dat produce the correct Eh-pH diagram? (I am using 2021 version of GWB and I realize this thread is quite old. So the documentation may have moved somewhere else.)

I am simulating (in the React module) leaching of chalcopyrite with sodium cyanide. I would like to calculate how much of cyanide is consumed in reactions with copper versus those with iron. How can I do this? Can this also be done in X1t and SpecE8? I am having trouble uploading the input file. But here is the text below: ###################################################################################### # React script data = thermo_minteq_modAK.tdat verify conductivity = conductivity-USGS.dat porosity = .3 temperature = 25 C H2O = 1 free kg Na+ = 600 mg/l swap O2(g) for O2(aq) O2(g) = .2 fugacity pH = 11 CN- = 600 mg/l Fe+++ = 1e-8 mmol/kg SO4-- = 1e-8 mg/l as S Cu++ = 1e-8 mg/l balance off fix fugacity of O2(g) fix pH react 20 mmol of Chalcopyrite suffix pH11 printout basis = short reactions = short #########################################################################################