You might be able to make pyro-grade aluminum powder with a strong base. You'll have to keep it from oxidizing though. If it's aluminum oxide, don't not or inhale it. You can actually make delta dust from that stuff. DON'T use a powered grinder of any sort. First of all you will make it dull. Second it will become corrosive to the parts making the wheel turn and could possible come off; how much would it hurt getting hit by a heavy wheel turning possible 1000rpm or higher? It most likely wouldn't do it to a blender though.
