Eddy currents like this are used to separate aluminum from other recyclables. I'm sure if you look, you can find a youtube video. Basic process is spread recyclables in a thin layer, use conventional electromagnets to pull steel out. Then as the material goes over a drop, there's a rotating magnet. That repels the aluminum cans (and anything else conductive and non-magnetic) away from it. That's enough that the cans fall into a different place than the bottles, paper, and plastic. That increased level of mechanized sorting is one of the reasons that single stream recycling (where the end user can put everything in the same bin, and someone else sorts it out) has become practical.