Development of a restraining wall and screw-extractor discharge system for continuous jig separation of mixed plastics

Phengsaart, Theerayut; Ito, Mayumi; Kimura, Shoko; Azuma, Arisa; Hori, Kunihiro; Tanno, Hideaki; Jeon, Sanghee; Tabelin, Carlito Baltazar; Hiroyoshi, Naoki

doi:10.1016/j.mineng.2021.106918

Cited by 9 publications

(7 citation statements)

References 27 publications

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“…Moreover, separation was possible even when CC RA are less than 1.7 ( Table 1 ). This improvement to the CC guide of Gupta and Yan (2016) could be attributed to the high precision control of water pulsation in advanced jig ( Phengsaart et al, 2021 ). It was found that PP was concentrated in the top layers while PE (i.e., LDPE or HDPE) was concentrated in bottom layers.…”

Section: Resultsmentioning

confidence: 99%

“…Among the many types of jigs, four advanced jig separation technology—RETAC jig, reverse jig, hybrid jig, and reverse hybrid jig ( Figure 1 )—were developed in the Laboratory of Mineral Processing and Resources Recycling, Hokkaido University, Japan for plastic-plastic separation. First, the RETAC jig, modified from coal cleaning TACUB (Tsunekawa Air Chamber Under Bed) jig (commercially called as BATAC jig) ( Hori et al, 2009a ; Tsunekawa et al, 2012 ; Phengsaart et al, 2020 , 2021 ), was successfully applied to recover plastics and other valuable materials from copy machines ( Tsunekawa et al, 2005 ), automobile shredded residues (ASR) ( Kuwayama et al, 2014 ), small home appliances ( Phengsaart et al, 2018 ), mobile phones ( Jeon et al, 2019 ) in both laboratory- and pilot-scales. Second, the reverse jig, which is the RETAC jig with top screen, was developed to separate plastics lighter than water (e.g., PP and high-density polyethylene (HDPE) from packaging containers) by their difference in levitating velocity ( Ito et al, 2010 ).…”

Section: Introductionmentioning

confidence: 99%

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Reverse hybrid jig separation efficiency estimation of floating plastics using apparent specific gravity and concentration criterion

et al. 2022

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We developed a technique called the reverse hybrid jig, an advanced physical separation technique that combines the principles of jig and flotation to separate floating plastics. This technique is a promising green technology that is more economical and environmentally friendly compared with the conventional flotation. Although the applicability of this technique to separate PP/PE have been reported, the index to illustrate the possibility of separation for the reverse hybrid jig is still not available. In this study, a reverse apparent concentration criterion (CCRA) is proposed to estimate reverse hybrid jig separation efficiency. This modified concentration criterion can be calculated using the specific gravity (SG) of particle with attached bubbles called the apparent specific gravity (SGA). To determine the volume of attached bubbles on plastic surfaces under water pulsation, a laser-assisted apparatus was used under various conditions, including plastic type, air flow rate, dosage, and type of wetting agent. The results of attached bubble volume measurements were used to calculate the SGA and CCRA. The estimated values were then compared with the results of reverse hybrid jig separation. It was found that higher CCRA resulted in better separation efficiency. In addition, an empirical linear equation for estimating the reverse hybrid jig separation efficiency is proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reverse hybrid jig separation efficiency estimation of floating plastics using apparent specific gravity and concentration criterion

et al. 2022

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“…Gravity-based separation technologies like float-and-sink and jigs can also be applied for the recycling of various kind of wastes (e.g., automobile [ [289] , [290] , [291] ], home appliances [ 292 , 293 ], small home appliances [ 294 ], mobile phones [ 285 ], copy machines [ 295 ], electrical wires [ 293 , 296 ], plastic containers [ 297 ], and mixed plastics [ 295 , [298] , [299] , [300] , [301] ]. More recently, the advanced jig technology including reverse jig [ 297 ], hybrid jig [ 285 , 292 , 293 , 302 ], and reverse hybrid jig [ 296 , 303 ] were introduced to separate the mixed plastic waste that have similar SG as well as floating plastics.…”

Section: Critical Discussion Future Perspective and Conclusionmentioning

confidence: 99%

Conventional and recent advances in gravity separation technologies for coal cleaning: A systematic and critical review

Phengsaart¹,

Srichonphaisan²,

Kertbundit³

et al. 2023

Heliyon

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“…Although its metal content is not negligible, about 90% of its mass is composed of non-metallic materials, the vast majority being organic substrates (resins, polymers, fiberglass, etc.). These waste plastics are an intermediate product on their own, as they can be further processed to recover individual polymers [36,37] or, due to their high carbon content, used as a combustible or a reducing agent in smelting processes [38]. The denser stream feeds the second density separation stage, generating a concentrate in the density range −2.8 + 2.1 g/cm 3 that is rich in aluminum, except for the −2 mm size, whose composition is more like that of the non-metallic product obtained in the first separation stage.…”

Section: Discussionmentioning

confidence: 99%

Development of a Physical Separation Route for the Concentration of Base Metals from Old Wasted Printed Circuit Boards

et al. 2021

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Wastes from old electronic devices represent a significant part of the electronic scrap generated in developing countries, being commonly sold by collectors as low-value material to recycling hubs abroad. Upgrading the quality of this waste type could drive the revenue of recyclers, and thus, boost the recycling market. On this basis, this study investigated the possibility of concentrating metals from old wasted printed circuit boards through a physical separation-based route. Preparation of samples comprised fragmentation, size classification, density, and magnetic separation steps, followed by chemical and macro composition analysis. Cu, Al, Fe, and Sn constituted the major metals encountered in the scraps, including some peak concentrations of Zn, Sb, Pb, Ba, and Mn. Four distinct concentrate products could be obtained after suitable processing: (a) a light fraction composed of plastics and resins; (b) an aluminum concentrate; (c) a magnetic material concentrate, containing mainly iron; (d) a final concentrate containing more than 50% in mass of copper and enriched with nonferrous metals. Preliminary evidence showed that further processes, like the separation of copper wires through drumming, can potentially improve the effectiveness of the proposed processing circuit and should guide future works.

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Development of a restraining wall and screw-extractor discharge system for continuous jig separation of mixed plastics

Cited by 9 publications

References 27 publications

Reverse hybrid jig separation efficiency estimation of floating plastics using apparent specific gravity and concentration criterion

Reverse hybrid jig separation efficiency estimation of floating plastics using apparent specific gravity and concentration criterion

Conventional and recent advances in gravity separation technologies for coal cleaning: A systematic and critical review

Development of a Physical Separation Route for the Concentration of Base Metals from Old Wasted Printed Circuit Boards

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