Long Gap Mills

Long Gap Mills

Long Gap Mills are used in size reduction, thermal processing and classification. Long gap mills can be equipped with wear resistant components such as hard steel or ceramic liners, carbide tipped blades and plasma coated classifier wheels.

Classifier options include radial blades, impeller style forced vortex and independently driven forced vortex classifier assemblies. Adjustable blade clearance and pro- vision for additional rotor stages add to the versatility of the long gap mill.

Operation

Autogenous grinding occurs as material mixed with air enters a highly turbulent zone formed by the high speed rotation of closely spaced blades against a serrated stator. Grinding takes place in the 2- 3mm annular gap formed by the blade tip and liner surface. A “long gap” is created by vertically stacking 5-10 rotor sections depending on mill sizes. The high residence time of the particles in overlapping layers of vortex pockets creates a very powerful grinding mechanism.