Development of Environmentally Attractive Leachants. Volume 3. Geochemical Flow Modeling

摘要

The report describes the development and application of PHASEQ/FLOW, a geochemical flow simulator capable of describing the dynamic changes in chemical composition of an aqueous solution during flow in a permeable medium. The solution components can react through intraaqueous reactions, redox, precipitation, or dissolution. The assumption of local thermodynamic equilibrium ensures maximum generality with respect to the number of species and components possible; however, the fluid flow itself is limited to one dimension. The report describes several applications: generic batch equilibria, flowing equilibria, uranium roll-front deposition, and roll front leaching.