Would a 'floatation pool' work in separating the plastic from the copper?

Its a small pool/drum/container full of slightly soapy water.
As the copper/insulation mix is fed into the pool, compressed air is forced up into the water & as the mix hits it, the copper drops as its heavy & small & the plastic floats as its larger & light & a higher surface area.

The bubbles to attach to the plastic, making it even lighter.