Numerical modelling of salt leaching-dissolution process

Farid Laouafa (1) , Jianwei Guo (2) , Michel Quintard (2) , Haishan Luo (2)

1 INERIS - Institut National de l'Environnement Industriel et des Risques
2 IMFT - Institut de mécanique des fluides de Toulouse

Extraction of salt by leaching process is used intensively nowadays. This process extracts salt by dissolving the mineral with water. In this analysis about cavity dissolution modeling, we consider the case of a binary system, i.e., a chemical solute corresponding to the solid that is dissolved by a “solvent” (mainly water). Rock salt dissolution is controlled by thermodynamic equilibrium at the interface, i.e., equality of the chemical potentials. In this paper, a local non-equilibrium Diffuse Interface Model (DIM) and an explicit treatment of the brine-salt interface (using an ALE (Arbitrary Lagrangian-Eulerian) technique) are introduced in order to solve such dissolution problems. The control equations are obtained by upscaling micro-scale equations for a solid-liquid dissolution problem using a volume averaging theory. Based on this mathematical formulation, dissolution test cases are presented. We introduce and discuss the main features of the method. Illustrations of the interaction between natural convection and forced convection in dissolution problems are presented and the time and space evolution of the rock salt-fluid interface is shown through several examples.

Domaines: Sciences de la Terre

Farid Laouafa, Jianwei Guo, Michel Quintard, Haishan Luo. Numerical modelling of salt leaching-dissolution process. 49. US Rock Mechanics / Geomechanics Symposium, Jun 2015, San Francisco, CA, United States. ⟨ineris-01855079⟩