It's your dime, that you've paid. Included in the price. Same thing exists in Sweden for plastic, for example.
Usually such schemes are basically incentives for homeless (or poor) people to clean up streets paid from the can buyers pockets.
As far as I'm concerned, that ain't worth it; they can keep the dime and deal with the can in the trash bin, I couldn't care less.
Is it enough to slow aluminium on a conveyer or something?
The rotor contains powerful magnets and when it spins quickly it induces a magnetic field in nonferrous metals like aluminum, repelling them from the rotor so that they overshoot the "other waste" bin.
But anyway, what I've been told is that any kind of adulterants on metals aren't even a big deal because that will easily burn off when they melt them. Think about the Terminator in Terminator II. The leather jacket, and indeed The Chip were not a problem when he was lowered into the steel. :'(
I have to take the cans down to the recycling center and throw them one by one into some machine and maybe they'll get recycled. Any compensation I might get is from the state, which is basically a dime for a can.
At that point I'm just going to throw them all in the trash, not worth my time nor fuel to drive down.