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Journal of Material Cycles and Waste Management

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07-01-2020 | ORIGINAL ARTICLE

Jig separation of crushed plastics: the effects of particle geometry on separation efficiency

Authors: Theerayut Phengsaart, Mayumi Ito, Arisa Azuma, Carlito Baltazar Tabelin, Naoki Hiroyoshi

Published in: Journal of Material Cycles and Waste Management | Issue 3/2020

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Abstract

Secondary resources (i.e., wastes) contain a wide variety of materials (e.g., plastics, metals, and wood) of various sizes and shapes that complicate separation especially when using gravity-based separation techniques. In this study, the effects of particle geometry (i.e., size and shape) on jig separation of crushed plastics were investigated. Plastic boards with 2-mm and 3-mm thicknesses of acrylonitrile butadiene styrene (ABS, specific gravity (SG) = 1.03) and polystyrene (PS, SG = 1.06) were crushed to obtain a size fraction of + 2.0–8.0 mm. The shape distribution in each size fraction (+ 2.0–2.8, + 2.8–4.0, + 4.0–5.6, and + 5.6–8.0 mm) showed the strong effects of crushing on particle shape; that is, particles are more disk-like at coarser size fraction but becomes more sphere-like at finer size fraction. Settling velocity of sphere-like PS increased with increasing particle size while those of disk-like ABS had similar values regardless of the size, which were consistent with the results of jig separation of single-type plastics. The results of jig separation of mixed-type plastics showed that separation efficiency was higher for the mixture of light, disk-like particles (ABS) and heavy, sphere-like particles (PS).

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Title: Jig separation of crushed plastics: the effects of particle geometry on separation efficiency
Authors: Theerayut Phengsaart
Mayumi Ito
Arisa Azuma
Carlito Baltazar Tabelin
Naoki Hiroyoshi
Publication date: 07-01-2020
Publisher: Springer Japan
Published in: Journal of Material Cycles and Waste Management / Issue 3/2020
Print ISSN: 1438-4957
Electronic ISSN: 1611-8227
DOI: https://doi.org/10.1007/s10163-019-00967-6

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