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1. A comminution device for mechanically comminuting material conglomerates comprised of materials of varying density and/or consistency, comprising a comminution chamber having a supply side with a supply device above the comminution chamber and a discharge side, the comminution chamber is enclosed by a circular cylindrical comminution chamber wall and has at least two portions in succession in an axial direction, in each of the at least two portions at least one rotor is arranged coaxial with the comminution chamber, each rotor having a rotor shaft and striking tools which extend substantially radially into the comminution chamber at least during operation, the rotors having opposite directions of rotation in at least two successive portions, deflection ribs being arranged inside of the comminution chamber wall, wherein a plurality of dust outlets are arranged in the comminution chamber wall and are connected to an air flow device for discharging a particle/air mixture produced in the comminution chamber, the air flow device has at least one fan for transporting the particle/air mixture from the comminution chamber, wherein the plurality of dust outlets are connected to an end of a channel and the airflow device is connected to another end of the channel located outside the comminution chamber wall, and wherein the comminution device has a control system for a fan drive of the fan, and a dust sensor is arranged on the supply side, and the fan drive can be controlled as a function of an output signal of the dust sensor.
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