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Estimation of hybrid jig separation efficiency using a modified concentration criterion based on apparent densities of plastic particles with attached bubbles

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Title: Estimation of hybrid jig separation efficiency using a modified concentration criterion based on apparent densities of plastic particles with attached bubbles
Authors: Ito, Mayumi Browse this author →KAKEN DB
Saito, Ayumu Browse this author
Murase, Nana Browse this author
Phengsaart, Theerayut Browse this author
Kimura, Shoko Browse this author
Kitajima, Naho Browse this author
Takeuchi, Megumi Browse this author
Tabelin, Carlito Baltazar Browse this author
Hiroyoshi, Naoki Browse this author →KAKEN DB
Keywords: Recycling
Hybrid jig
Plastic separation
Attached-bubble volume
Issue Date: Nov-2020
Publisher: Springer
Journal Title: Journal of material cycles and waste management
Volume: 22
Issue: 6
Start Page: 2071
End Page: 2080
Publisher DOI: 10.1007/s10163-020-01090-7
Abstract: The hybrid jig, which combines the principles of jig separation and flotation, was recently developed to separate mixed-plastics with similar specific gravities (SG) effectively. In this type of jig, air bubbles are introduced during water pulsation to modify the apparent SG (SG(apparent)) of plastics by the attachment of air bubbles to the particles so that the hybrid jig can separate materials having identical SGs if their surface wettabilities are different. Because the change in SG(apparent)-determined by the volume of attached bubbles on the particle surface-is critical for efficient separation in hybrid jigs, a method to estimate this parameter should be developed. In this study, a laser-assisted measurement apparatus was developed to quantify the attached-bubble volume on plastics during water pulsation. Hybrid jig separation was also conducted using three mixtures containing plastics of almost identical SGs: (i) polyvinyl chloride (PVC)/polyethylene terephthalate (PET), (ii) polypropylene with glass fiber (PPGF)/high-impact polystyrene (HIPS), and (iii) cross-linked polyethylene (XLPE)/polyethylene (PE). Finally, to estimate the separation efficiency of hybrid jig, a new index called the apparent concentration criterion (CCapparent) is proposed. The results showed that SG(apparent)and CC(apparent)calculated using the proposed methods could be used to estimate the hybrid jig separation efficiency.
Rights: This is a post-peer-review, pre-copyedit version of an article published in Metals and Materials International. The final authenticated version is available online at:
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 伊藤 真由美

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