| Title | Computer Simulation of Temperature-Dependent Equilibrium Precipitation |
|---|---|
| Authors | Wolery, T. J. |
| Year | 1979 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Chemistry; Calculations; Scaling; USA; California; East Mesa; Igneous Species; Minerals; Thermodynamics; Precipitation; Affinity; Redox; Corrosion; Reinjection; LLML; US DOE |
| Abstract | The EQ3 software package contains two computer codes (EQ3 and EQ6) and data files which form a useful tool in modeling precipitation from geothermal fluids caused by heating or cooling. The data files contain information on 140 aqueous species and nearly 150 minerals, and permit calculations over the temperature interval 0-350°C. Assumption of homogenous thermodynamic equilibrium in aqueous solution permits calculations of the driving force for precipitation as measured by the affinity for each such reaction. Further assumption of precipitation and heterogeneous equilibrium of any mineral whose affinity would otherwise exceed a value of zero permits determination of the identify of the precipitates, their masses and volumes, and the temperature ranges in which they form. |