Deciphering pore-level precipitation mechanisms

Area of Science:

• Geochemistry
• Materials Science
• Chemical Engineering

Background:

• Mineral precipitation and dissolution significantly influence solute transport and the structural integrity of porous media.
• Understanding these processes across various scales is crucial for geochemical and industrial applications.

Purpose of the Study:

• To investigate the impact of homogeneous and heterogeneous precipitation kinetics and solute concentration on system evolution.
• To demonstrate the necessity of incorporating microscale physical processes into macroscopic models.

Main Methods:

• Coupling pore-scale reactive transport simulations with classical nucleation theory.
• Conducting comprehensive parametric analysis.
• Comparing simulation results with laboratory experiments.

Main Results:

• The interplay between precipitation kinetics and non-linear solute concentration dependence significantly affects system evolution.
• Microscale physical processes, often overlooked in macroscopic models, are essential for accurate predictions.
• The study successfully bridges the gap between atomistic mechanisms and macroscopic observations.

Conclusions:

• Detailed microscale physical processes must be incorporated into models for accurate simulation of mineral precipitation and dissolution.
• This approach enhances understanding of the coupling mechanisms governing geochemical and industrial processes.