A Three-Dimensional Comprehensive Numerical Model of Ion Transport during Electro-Refining Process for Scrap-Metal...

Area of Science:

• Materials Science
• Chemical Engineering
• Computational Modeling

Background:

• Scrap metal recycling is crucial for resource sustainability.
• Electro-refining is an effective method for metal recovery.
• Understanding ion transport is key to optimizing electro-refining efficiency.

Purpose of the Study:

• To develop a numerical model for ion transport in electro-refining.
• To investigate the influence of diffusion, convection, and electro-migration on ion behavior.
• To analyze the impact of fluid flow on ion concentration and reaction kinetics.

Main Methods:

• Established a transient three-dimensional numerical model.
• Utilized Poisson-Nernst-Planck equations for ion transport.
• Employed Naiver-Stokes and energy equations for fluid flow and heat transfer.
• Applied Butler-Volmer formulation for electrochemical reaction kinetics.

Main Results:

• The model accurately simulates ion transport, validated against experimental data.
• Positive copper ions move towards the cathode, and negative sulfate ions move towards the anode.
• Fluid flow significantly alters ion concentration distribution.
• Fluid flow reduces anode ion concentration and electrochemical reaction rates.

Conclusions:

• The developed model reliably predicts ion transport in electro-refining.
• Fluid flow plays a critical role in optimizing the process.
• The computational framework provides a foundation for advancing scrap metal recycling technologies.