Professor Eric Laithwaite's prototype metal sorter

blogs.imperial...
Professor Eric Laithwaite (1921-1997), former Professor of Heavy Electrical Engineering at Imperial College London, shows a prototype sorter for metal waste.

[@WVCapsfan]

I think your solution to trapped pieces would be simply to have multiple sorting stages with some sort of shaker/mixer in between. OK, now how do you separate copper and brass from steel?

[@Anenome5]

Why doesn't it repulse the other metals too?

[@kkumar-kkr7727]

Aluminium will push all the things that comes in its front, into the container.