Abstract: The present invention concerns apparatus for comminuting agglomerates and similar material to be comminuted, comprising a rotor (1) which is drivable in rotation and which has a plurality of blade-like comminuting tools (24) which can be brought into contact with the material in order to comminute same. In order to provide an apparatus for comminuting agglomerates and similar material as well as a corresponding method, which ensure a better comminuting effect and thereby and also by further measures substantially prevent material caking phenomena it is proposed in accordance with the invention that the comminuting tools comprise narrow knives (24) whose thickness measured in the axial direction of the rotor does not exceed 20 mm and whose repetition spacing in the axial direction is a maximum of 50 mm.