Segregation of bulk solids – causes and solutions

In many processes, individual steps involve the presence of bulk solids as the primary, intermediate or end product, and the individual particles can cover a size range encompassing eight powers of ten. The flow behaviour of bulk solids, however, depends not only on the size of the particles, but also on their shape and density and, not least, on the moisture content of the material. In certain applications, it is not only important to ensure reliable flow, i.e., to avoid flow obstructions, but also and primarily to prevent segregation.

1 What causes segregation?

Segregation becomes a problem when downstream processes require that the bulk solid be of uniform composition. This is the case, for example, when the product is to be packaged in portions of identical composition (sales packages or the like), or when a downstream process could become unstable if the product composition were to vary.

Bulk solids tend to segregate, if the particles differ in terms of size, shape or density. Bulk solids with very poor flow behaviour, such as very fine-grained titanium dioxide, or which are too moist (e.g., moist clay) normally show...

Related articles:

Issue 2010-11

“From bulk solids to the silo”

The university course “From bulk solids to the silo” will take place in Brunswick/Germany from 21.–22.02.2011. The main topics will focus on silos, i.e. from the characterization of bulk solids via...


Measure bulk material throughput contactless online

DYNA Instruments offers innovative measuring technology from its own development and production for applications in the bulk handling and particle industry. The DYNAmas, new in the portfolio of the...

Issue 2013-10

Cascade solution for efficient fillinig

It is a well known problem that when filling products with different particle shapes, sizes or weights, a separation occurs that deteriorates significantly the quality of the mix - such as powder...

Issue 2010-04

KOKEISL Industrial Systems AG

At POWTECH, KOKEISL Industrial Systems, an internationally expanding supplier of bulk solids picking and dosing systems, will be informing visitors about automated workflows for the chemicals,...

VEGA GRIESHABER KG | Powtech 2019 | 4.514

Universal measurement of bulk solids

With its high frequency of 80 GHz, Vegapuls 69 solves challenging measuring tasks in bulk solids – contactless. With its small beam angle, silo installations and reflections from the vessel walls are...