A rock dusting or aggregate distributing apparatus is provided having a cylindrical tank body connected to an air supply unit. A circular member is disposed within the cylindrical tank body between the top member and the bottom member to divide the cylindrical tank body into a top portion and bottom portion, the circular member is configured to inject air from the bottom portion into the top portion in a substantially circumferential direction with respect to an axis of the cylindrical tank body to disperse rock dust or aggregate.