Ultra-fine Grinding and Ultra-fine Classifying on a Laboratory Scale
Using the spiral air classifier as a model, the infernal processes in a classifier rotor with vanes are discussed and test results compared. The test data was obtained from rotors with an external diameter of 260 mm and 360 mm. Fine materials were produced with d97 of approximately 2.5 µm. The comparison illustrates that results achieved in practice can be interpreted from the described model. The new classifier rotors are already in use in air classifiers and classifier mills; the Superfine Classifier CFS and the Fluidized Bed Opposed Jet Mill CGS are presented.