Dust implosions can be extremely powerful. A single cup of flour, when vaporized, can have the explosive force of two sticks of dynamite.
This is one of the reasons that coal mining is so incredibly dangerous, and mines have to be kept “swampy” with water, because the combination of coal dust and flammable gases in the mine is a recipe for disaster.
The reason for the danger is that fine dust has a vast surface area exposed to the air, because of the small size of particles, so oxidation is very fast.
You don't say! Hmmm...