Abstract
The Tower Mill KD-2 is a modified version of the Tower Mill KD-1 developed for grinding limestone. In comparison with KD-1, this new equipment is performed with three clearly defined parts: comminuting, classifying and collecting. Furthermore the inside diameter of the column classifier was enlarged (to 780mm) to regulate of ground particle velocity and the comminuting cell provided with two tapers (slope at the bottom of comminuting part) of different size.
Experiments were carried out to investigate the taper effect on ground particle. As a result, weights of products and the 50% particle diameters were found higher using the small taper than the big one, but the maximum values of the diameter of the ground particles (Dmax) were similar.
In regard to Dmax compared with the Tower Mill KD-1, the following have been established: 1) Pulverization of limestone under a flow rate lower than 0.06m/s is improved using the Tower Mill KD-2 and the minimum Dmax value is founded to be a 15.5μm.
2) Dmax values distribution above the estimated curve assumed by stokes's law indicate that it will be possible to produce finer particles by improving the classifying part.
