pulverizing-mill

from The Century Dictionary.

• noun An apparatus for reducing the ingredients of gunpowder separately to an impalpable powder before they are combined in the incorporating-mill.
• noun In candy-making, a power-machine for reducing granulated sugar to the extremely fine flour of sugar used in sweetening chocolate. It is essentially a centrifugal mill with an air-blast for removing dust and discharging the finished flour into barrels.