CLASSIFYING APPARATUS FOR POWDERY SUBSTANCE

摘要

A classifying apparatus including a magnetic stirrer composed of main body (1) and rotor (2) and, disposed on the main body of the magnetic stirrer, classifying tube (3). The interior of the classifying tube is provided with classifying compartments (A-E) partitioned from each other by divider plates (5a-5b). The lowermost classifying compartment (A) is furnished with gas emission conduit line (7). In the classifying compartment (A), the rotor (2) of the magnetic stirrer is disposed. From gas supply source (8), a high-pressure gas is fed into the gas emission conduit line. By means of the gas emitted from the gas emission conduit line, a vortex flow rising from the lowermost classifying compartment sequentially toward superior classifying compartments is generated in the classifying tube. Simultaneously, the rotor of the magnetic stirrer is rotated, so that powdery substance (O) within the classifying compartment (A), while being carried by the vortex flow, undergoes particle size classification in each of the classifying compartments.