Apparatus for classifying dust-like bulk materials

摘要

The invention relates to a method for classifying dust-like bulk materials, in particular ground clinker, limestone or cement raw material and materials of related type of the chemical and food industries, by classification by air. The material to be classified is fed to the centrifugal plate (13) of a cylindrical rotor (11) and fed to a classifying space (18) in the form of an annular cylinder, which extends between the rotor (11) and a stationary blade ring comprising guide blades (21), which surrounds the rotor (11) at a distance. While the coarse material sinks downwards in the classifying space (18), the fine material is conveyed into the interior of the rotor (11), drawn off at the top and fed to cyclone separators (6) connected downstream for separation of fine material and classifying air. In order to prevent the occurrence of spray material in the fine material, the rotor (11) is designed so as to have an at least partially open bottom (15), and a discharge plate (16) for the spray material occurring in the interior of the rotor is arranged below the rotor bottom. <IMAGE>