Cleaning shop floor with magnets - GIF

[Frank S]

looks like someone had been turning cast iron

[metric_taper]

I have a magnet designed for this purpose of picking up iron swarf off the floor. The use of a plastic jug bottom is good, as removing fine material from the exposed magnet is a PITA.
I machine plastics as well non ferromagnetic materials. That coupled with a rubber mat system with holes, makes for extra fun clean up. I typically hand pick up the larger swarf, then vacuum the dust and small turnings.

[Toolmaker51]

looks like someone had been turning cast iron

My impression is that remains of flame cutting, grinding and sanding typical in weld shops.

[Frank S]

My impression is that remains of flame cutting, grinding and sanding typical in weld shops.

Would generally have larger chunks in the sweepings for flame cutting I'll yield tot the grinding though.