Newly developed discharge device for jig separation of plastics to recover higher grade bottom layer product

Tsunekawa, Masami; Kobayashi, Riki; Hori, Kunihiro; Okada, Hisako; Abe, Naka; Hiroyoshi, Naoki; Ito, Mayumi

doi:10.1016/j.minpro.2012.09.003

Cited by 11 publications

(9 citation statements)

References 4 publications

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“…On the other hand, wet density separation processes including sink-float separation [22] and separation by layering (hydro jigs, [11,12,15,28]) are promising options for PO separation. Separation by layering provides efficient pre-separation of heavy waste components, such as glass, stones, and metals.…”

Section: Dry Versus Wet Mechanical Waste Treatment-a Comparisonmentioning

confidence: 99%

Sink–float density separation of post-consumer plastics for feedstock recycling

Bauer

Lehner

Schwabl

et al. 2018

J Mater Cycles Waste Manag

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The paper focuses on current mechanical waste processing technologies and out-of-the-box processes linked to the processing of coal and mineral resources, to ensure high-quality feedstock recycling of polyolefin-rich post-consumer plastic fractions. Moreover, the study aims to provide the basis for the technical and economic feasibility of the chemical recycling route of this plastic fraction. When evaluating common mechanical processes, either dry or wet ones, sink-float separation in a cylindrical centrifugal force separator achieves the best results. It combines the advantages of a simple, robust apparatus of low complexity and high capacity with selective separation through the accelerated settling of particles in the centrifugal field. Furthermore, the disconnection of the separation medium feed from the solid input increases residence times. Based on the above findings, a pilot-scale plant was constructed which consists of a centrifugal force separator and a hydro jig for the pre-separation of heavy waste components. Several test campaigns were conducted to separate polyolefins from various waste fractions. Two-stage processing in the centrifugal force separator rendered almost 90 wt% of polyolefin content in the produced lightweight fraction and of polyolefin recovery. One-stage processing, on the other hand, resulted in reduced polyolefin content in the lightweight fraction.

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Section: Dry Versus Wet Mechanical Waste Treatment-a Comparisonmentioning

confidence: 99%

Sink–float density separation of post-consumer plastics for feedstock recycling

Bauer

Lehner

Schwabl

et al. 2018

J Mater Cycles Waste Manag

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“…In this, a second screen installed at the top of the RETAC jig container allows separating plastics based on differences in levitation velocity. Improvements in the scheme of product extraction were subsequently made for the RETAC [27] and hybrid [28] jigs. Recently, the separation of metal wires and plastics was tested with relative success in the RETAC jig [29].…”

Section: Jigs For Plastic-plastic Separationmentioning

confidence: 99%

“…Most notably, jigging has found particularly fertile ground in recycling and waste processing. As mentioned earlier, recycling of plastics like polyethylene, polycarbonate, and polyvinyl chloride PVC has even been boosting the development of new jigging devices, particularly in Japan [25,27,28]. In the case of metals recycling, jigging has been used to recover ferrous and non-ferrous metals from different sources, such as automobile scrap [44,45], steelmaking slag [46], and electric cable wastes [47].…”

Section: Applicationsmentioning

confidence: 99%

Jigging: A Review of Fundamentals and Future Directions

Ambrós

2020

Minerals

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For centuries, jigging has been a workhorse of the mineral processing industry. Recently, it has also found its way into the recycling industry, and the increasing concerns related to water usage has led to a renewed interest in dry jigging. However, the current scenario of increasing ore complexity and the advent of smart sensor technologies, such as sensor-based sorting (SBS), has established increasingly challenging levels for traditional concentration methods, such as jigging. Against this background, the current review attempts to summarize and refresh the key aspects and concepts about jigging available in the literature. The configuration, operational features, applications, types, and theoretical models of jigging are comprehensively reviewed. Three promising paths for future research are presented: (1) using and adapting concepts from granular physics in fundamental studies about the stratification phenomena in jigs; (2) implementing advanced control functions by using machine vision and multivariate data analysis and; (3) further studies to unlock the potential of dry jigs. Pursuing these and other innovations are becoming increasingly essential to keep the role of jigging as a valuable tool in future industry.

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“…Because of this SG difference induced by bubble attachment, particles with bubbles could be recovered as top layer products via jigging stratification (Hori et al, 2009b). The batch-type RETAC, reverse, and hybrid jigs have already been developed while for the continuous-type setup, only the RETAC and reverse jigs had been realized (Ito et al, 2010, Tsunekawa et al, 2012, Hori et al, 2009b.…”

Section: Introductionmentioning

confidence: 99%

Development of suitable product recovery systems of continuous hybrid jig for plastic-plastic separation

Ito

Saito

Murase

et al. 2019

Minerals Engineering

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A modified jig called the hybrid jig was recently developed to separate mixed-plastics with similar specific gravities effectively using the concepts of bubble attachment, surface wettability and gravity separation. This method was effective in a batch-type jig setup, but when applied to a continuous-type jig setup, the efficiency of the process dramatically decreased. This drop in efficiency was attributed to the unintended negative effects of air bubbles on separation especially close to the screw-type extractor at the product end though this type of product recovery system was successfully applied to the RETAC and reverse jigs. To address this problem, a better product recovery system for continuoustype hybrid jig is proposed in this study, and the effects of air injection rate at different positions of the hybrid jig separation chamber were evaluated. The results showed that fluidization behavior of particles in the hybrid jig was influenced by not only water pulsation but also the rising motion of air bubbles. To improve the purity of heavy materials in the bottom layer products, two product recovery systems are proposed: (1) a screw-type extractor with one "separating" single-screen, and (2) a screw-type extractor with modified air injection and water pulsation (i.e., upward flow period was shortened).

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Newly developed discharge device for jig separation of plastics to recover higher grade bottom layer product

Cited by 11 publications

References 4 publications

Sink–float density separation of post-consumer plastics for feedstock recycling

Sink–float density separation of post-consumer plastics for feedstock recycling

Jigging: A Review of Fundamentals and Future Directions

Development of suitable product recovery systems of continuous hybrid jig for plastic-plastic separation

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