On the Packing and Segregation Processes of the Particulate Solids by the Tapping Method

Abstract

The processes of segregation in binary particulate solid mixture were studied by photographing and comparison of the tapping curves. The steel ball, lead shot and spherical glass (these were coarse and regular shaped) were used in this tapping procedure for samples.
The results obtained were as follows:
(1) The tapping process of the binary particle mixture was classified into two types, that is, the non-segregation type as shown in Fig. 4 and Fig. 6, and the segregation type as shown in Fig. 5 and Fig. 7.
(2) It seemed that the tapping process in the non-segregation type was regarded as simple packing process of one component system.
(3) The concept of“critical diameter ratio of the small particles⁶⁾”proved right in the treatment of experimental results. The segregation proceeded when the diameter ratio was smaller than 0.4 and, when more than 0.5 the segregation did not proceed.
(4) The concept of“critical mixing ratio⁷⁾”turned out wrong in this experiment, because the effect of the mixing ratio was more complicated than the particle size ratio.