Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Gunner Asch fired this volley in
:



To be fair..it does need a good oxidizer to help as an accellerant.

It needs LOTS of oxidizer. With gobs of barium nitrate (which is a good
one), iron dust barely burns. THAT is what sparklers are made of.

Cast iron dust doesn't become pyrophoric until it's down below 1/4-
micron, and then only if it's deliberately cast into the air.

Sucking the stuff up with a vacuum cleaner would be more likely to cause
trouble than sweeping the stuff up.

I've got a pile of cast iron dust I can experiment with now.