We resolved a similar problem by feeding onto a vibratory plate which then feed into a hoopper and ultimately into our reactor. Our system was dust free and clean.
John
651-730-4526
A good way to test the tire-rubber content of road-side dust is to look for zinc metal levels in this dust as all tires have high levels of zinc as an additive. Zinc becomes problematic in the recycling of tires as it builds up in tire burning furnaces.