Key factors affecting the vertical eddy current separation efficiency between Cu and Al particles

Area of Science:

• Materials Science
• Environmental Engineering
• Mechanical Engineering

Background:

• Solid waste streams contain valuable aluminum (Al) and copper (Cu) particles.
• Efficient separation and recycling methods are crucial for resource sustainability and environmental protection.
• Vertical eddy current separation presents a promising technology for recovering these non-ferrous metals.

Purpose of the Study:

• To investigate the key factors influencing the separation of aluminum and copper particles using vertical eddy current separation.
• To analyze the effects of particle shape, size, magnetic roller speed, and magnetic roller structure on separation efficiency.
• To provide a scientific basis for optimizing the recycling of Al and Cu from solid waste.

Main Methods:

• Experimental analysis of vertical eddy current separation.
• Combined simulation using COMSOL Multiphysics and MATLAB.
• Systematic variation of particle shape (spherical, cylindrical, flaky), particle size (radii 2-8 mm), magnetic roller speed (up to 6000 rpm), and magnetic roller structure (Halbach Array, NS).

Main Results:

• Spherical and cylindrical Al/Cu particles show better separation than flaky ones, with spherical particles exhibiting a 1.95 times greater repulsion distance difference.
• Optimizing particle size ranges (e.g., 4-5 mm and 6-8 mm) minimizes mixing and enhances separation.
• Increasing magnetic roller speed to 6000 rpm with a Halbach Array roller effectively separates Al and Cu particles; speeds above 6000 rpm with an NS roller are suitable for smaller particles (2-8 mm radii).

Conclusions:

• Particle characteristics, operational parameters, and magnetic roller design critically influence Al/Cu separation efficiency in vertical eddy current systems.
• The findings offer valuable insights for designing and implementing effective recycling processes for Al and Cu from solid waste.
• Optimized separation contributes to sustainable resource management and significant environmental benefits.