Particle Shape Discrimination Using Slotted Sieves

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Abstract
A set of sieves having rectangular apertures has been used, with a set of square-mesh sieves, to separate powder particles according to their shape. A free-flowing granular material, sodium perborate tetrahydrate, was shape-sorted using the slotted sieves and also using an inclined, vibrating deck. The length, width, thickness, projected area diameter and equivalent volume diameter were determined for each shape-fraction and these data were used to calculate shape factors to assess the performances of the two methods It was found that both methods were capable of sorting the material according to particle shape. The deck was capable of a slightly higher throughput, but the sieves were more selective as well as being quantitative with respect to two of a particle's three principal dimensions.

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