Abstract: The invention relates to mining and metallurgy. The apparatus comprises a feed device, and a discharging device and a rotor mounted inside a housing formed with toothed sprockets set rigidly on a shaft. The sprockets are mounted in series on the shaft of the rotor and carry crescent-shaped teeth, a concave surface thereof being arranged radially with respect to the rotor and the cross section being a T with a web located at right angle to the axis of said rotor and with a flange situated in parallel to the axis of said rotor. The invention can most advantageously be employed for crushing a hot agglomerated mass and stabilizing sinter lumps in terms of shape and mechanical strength, but may also be used to crush large coal lumps, slag skulls, particularly, ones in hot state, flagstone blocks, frozen materials and the like.