Method and apparatus for grinding material particles.

摘要

A grinding apparatus includes a roller mill (10) in which material particles are pre-ground, a tube mill (40) connected to the roller mill (10) through a fluidized-bed-type classifying device (30) in which the material particles are classified in the sizes under control, and a circulation line (20) is connected between the classifying device (30) and the roller mill (10), wherein a fluidized portion of fine material component is fed into the tube mill (40), a remaining portion of not fed to the tube mill (40) is returned to the roller mill (10) through the circulation line (20) and the returned portion of the material component is again ground together with newly fed material particles in the roller mill (10). The fluidized-bed-type classifying device (30) is provided with a first chute (35) through which the fine material component is flowed out to the tube mill (40) and a second chute (36) connected to the circulation line through which the remaining material component is returned to the roller mill (10). The inner hollow space of the fluidized-bed-type classifying device is divided into an air introduction section (34) and a fluidized bed section (33) by a porous partition plate (32) arranged horizontally with inclination toward the second chute (36). The fluidized bed section (33) is communicated with both the tube mill (40) and the roller mill (10) and the air introduction section (34) is communicated with the material fluidizing fluid, such as air, of which a flow rate is controllable. <IMAGE>