A segmented grinding ring for centrifugal vertical roller mills is provided. The segmented grinding ring includes multiple cast segments which may be vaulted together using pin rods and shims to form a continuous ring. The segmented grinding ring enables the manufacture of the segments in a cast composite material.

The object of the is A fine grinding apparatus and a method for grinding granular material includes a grinding plate rotating on the horizontal plane around a vertical rotation axis, onto the top surface of which grinding plate the material to be ground can be fed, and on the top surface (of which grinding plate is a plurality of grinding discs, which rotate from the effect of the rotating motion of the grinding plate and compress the material to be ground against the grinding plate. The apparatus has one or more refiner elements pressing against the top surface of the grinding plate and rotatable around their vertical center axes, by means of which elements the material to be ground is kneaded on the top surface of the grinding plate.

The invention relates to a replaceable key grinding pan segment for a grinding track of a grinding pan of a roller mill, the grinding track having an annular shape with an outer circumference and an inner circumference around a center point. The length of the inner edge of the key grinding pan segment closer to the center point is greater here than the length of the outer edge further from the center point. The invention also relates to a grinding pan segment system, a roller mill, and a method for replacing grinding pan segments.

There is provided an apparatus and method for comminuting a material. The apparatus may comprise a chamber and an inner surface with a plurality of protrusions, and a hammer positioned within said chamber comprising an outer surface having a plurality of second protrusions configured to engage with the first protrusions. The outer and inner surfaces may be separated by a gap distance which defines a comminution zone. The anvil may be rotated to cause a material to be comminuted as the material passes through the comminution zone.