Apparatus for processing a material mixture comprising of alternative fuel and contaminants

A device for treatment of a material mixture comprising substitute fuel and impurities, the device having

• a vertically aligned central feeder (1),
• a separating unit (2) arranged underneath the central feeder (1),
• a rotor mill (3), wherein the rotor mill (3) is arranged above the separating unit (2) and surrounds the central feeder (1),
• a flow device (4) for generating an upwardly directed gas flow,
• wherein the material mixture is introducible into the feeder (1), and sinks to the separating unit (2) after introduction into the feeder (1), wherein in the separating unit (2) the impurities are separated at least partially from the material mixture as an impurity fraction, and the material mixture separated from the separated impurities rises with the gas flow to the rotor mill (3), wherein the rising material mixture is comminuted in the rotor mill (3), wherein the rotor mill (3) has a multistage design, wherein a respective separating device (6) is arranged between a first stage (5.1) of the rotor mill (3) and a second stage (5.2) of the rotor mill (3), wherein the separating device (6) holds back material mixture having a first particle size in the first stage (5.1), and wherein material mixture having a second particle size that is smaller than the first size that is not held back by the separating device (6) is further comminuted in the second stage (5.2).