On Feb 9, 9:14*pm, "Whole-Wit" hhdh9uhh@fsb wrote:
Imagine 22,000 lbs of ground-up tires... [with recyclable lead and copper slugs]
One of the ideas we've had is to float the rubber in water and skim it off. *But, 1/2
of a sample amount floats, 1/3 sinks and 1/6 stays suspended.

Salt the water. More than half will float.

A shot tower that dribbles bits from above, with a suitable
crossventilation source, can separate the wheat from the
chaff, too.

How do grain separators work? Can you rent a threshing/winnowing
gizmo?