To provide a method for pneumatic sorting of solid which can sort needle-shaped materials and non-needle-shaped materials in a crushed mixture efficiently and precisely, and an apparatus for the method.
An air current which ascends in a pneumatic sorting column 1 is supplied from the air current supply port 30 of the column 1, a crushed mixture of needle-shaped materials and non-needle-shaped materials is supplied from a supply port 22, and the mixture is fluidized in a fluidizing region 27 between an upper part narrow cylinder 21 and a mesh plate 25. In this region 27, the needle-shaped materials tend to be decelerated to fall with the longitudinal direction directed to the gravity direction so that they pass through the mesh plate 25 to be recovered below the column 1. The crushed mixture which repeats floating and dropping in the fluidizing region 27 is discharged through the discharge opening in the sidewall of the column 1. The lightweight materials in the crushed mixture are floated to the upper part of the column 1 to be discharged.
ITO SHINICHI
SAKAMOTO HIROSHI
OOI HIDEFUSHI
YOTSUMOTO KOKI
