Metal Grit Recovery

If it's steel shot, it should be magnetic. Why not use one of these? They sell them in all sizes.

http://en.wikipedia.org/wiki/Electromagnet

Here the blasting is done on metallic substrates.

Will it work here. Is there any kind of selective magnetism available.

Expecting your suggestions.

Assuming the substrates are of a magnetic composition, would it matter if smaller metal bits are mixed with the shot for reuse?

More information is needed:

What are you blasting?

What are you removing from the substrate when blasting?

Is the elimination of dust your primary concern?

Provide as much detail as possible as to your operation and what, specifically, you are looking to achieve.

I don't know how much money you're looking to spend, but these look pretty impressive. http://www.blastabrade.com/shot-blasting-intro.htm

blasting is done prior to rubber lining, rubber moulding (compression). the metallic substrates mixed with the abrasives gives a different (lesser) profile, which effects the overall production. At mechanical sieving is done which is not that effective. the recoverability now is around 6-8 times, which should be increased to at least 20 times.

I think you should look into vacuum recovery systems, they will give you clean shot, and should eliminate the dust problem.

Here's one........I'm sure there are many more.

http://www.americanvacuum.com/case_histories/detail.asp?CASE_ID=88

A simple belt magnetic separator would do the job. Sieve out the undersize shot after separation.

Generally done with air wash separators which blow the dust from the shot. The dust is then vacuum out into a collection vessel.

I would suggest using a centrifugal sifter Kek Gardner make various models. I have used them in the plastics industry although they were designed for sifting grain. I see no reason why you couldn't use them for steel grits, it's just a question of what the sieve is made of and the size of the mesh.

http://www.kemutecusa.com/products/kek/sifters/sifters.htm

I hope this is of help

Steve