Technological Developments in Wet Gravity Separation Processes

Tsunekawa, Masami; Hori, Kunihiro; Hiroyoshi, Naoki; Ito, Mayumi

doi:10.2473/shigentosozai.121.467

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…This jig is a candidate for further treatment of ASR. Tsunekawa et al have reported that this jig is useful to separate relatively low-density particles such as plastics [7][8][9], and it has also been demonstrated that highly efficient jig separation of different types of plastic components in waste office automation equipment recycling is possible in pilot-scale tests [10].…”

Section: Introductionmentioning

confidence: 97%

Jig separation of crushed automobile shredded residue and its evaluation by float and sink analysis

Kuwayama

Ito

Hiroyoshi

et al. 2011

J Mater Cycles Waste Manag

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Automobile shredded residue is a potential solid fuel when its metal and chloride-containing components have been removed. The authors have investigated physical separation of automobile shredded residue to isolate components that may be used as solid fuel and reported that agglomerates of entangling fiber-like material are formed during crushing. These agglomerates make removal of metals and chloride-containing components difficult, and the paper proposes a treatment flowchart consisting of separate treatments of the coarse size fraction containing entangling fiber-like components and the smaller size fraction containing particulate matter. This paper reports the treatment of the smaller size fraction treated with jigging to obtain a low-ash and low-chloridecontent product. A new washability curve was developed based on float and sink analysis test results, and it was applied to estimate the gravity separation performance of treatments such as jigging and dense medium separation. The estimated results show good agreement with the experimental results of jig separation.

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Section: Introductionmentioning

confidence: 97%

Jig separation of crushed automobile shredded residue and its evaluation by float and sink analysis

Kuwayama

Ito

Hiroyoshi

et al. 2011

J Mater Cycles Waste Manag

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“…6) Based on this observation, a Hybrid-Jig, a TACUB jig with an air bubbler under the particle bed (screen), has been developed to separate plastic particles having similar specific gravities but different surface properties. This paper reports the separation performance of the Hybrid-Jig.…”

Section: Introductionmentioning

confidence: 99%

Development of a New Gravity Separator for Plastics —a Hybrid-Jig—

et al. 2009

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The development of mechanical methods for plastic-plastic separation is important for recycling of scrapped plastics of office/home appliances and cars. This paper proposes a Hybrid-Jig as a new method for plastic-plastic separation. The Hybrid-Jig was developed based on jigging and flotation, where air bubbles are introduced into the particle bed during jigging to modify the apparent specific gravity of the particles by the attachment of air bubbles to the particles so that particles having different surface properties can be separated by jigging even if their specific gravities are similar.To demonstrate the performance of the Hybrid-Jig, a laboratory scale TACUB jig was modified to induce air bubbles through the screen under the particle bed, and separation experiments of plastic particle mixtures were carried out under various displacements and frequencies of water pulsation. Feed samples were particle mixtures of two plastics chosen from eight kinds of plastics (3 of polyvinyl chloride (PVC), 4 of polyethylene (PE), and 1 of polyethylene terephthalate (PET)). The particles were cylindrical of 2-3 mm length and diameter, and their specific gravities were 1.05-1.55.In normal jig operation (without air bubbles), plastic particles with similar specific gravities were difficult to separate, but they were easily separated by the Hybrid-Jig, when air bubbles adsorbed on the surface of the more hydrophobic plastics, and the plastic particles with air bubbles were recovered as top product due to the decrease in apparent specific gravity. Because the differences in the hydrophobicity of the plastics cause the selective bubble attachment, high grade plastic products over 99.9 mass% were recovered by the Hybrid-Jig even for plastic mixtures having the same specific gravity.

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“…The TACUB jig is widely used for coal cleaning and Tsunekawa et al have reported that this jig is very useful to separate relatively low density particles such as plastics 1) and have demonstrated that highly efficient jig separation by type of plastic component in waste office automation equipment recycling is possible in pilot-scale tests.…”

Section: Introductionmentioning

confidence: 99%

Immersion Behavior of Automobile Shredded Residue in Surfactant Solutions and Detachment of Particulate Matter

et al. 2008

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This study investigated the effect of the addition of wetting agents on automobile shredded residue (ASR) wettability, and found that the surfactants diisooctyl sodium sulfosuccinate (AOT) and sodium dodecyl sulfate (SDS) were effective to improve immersion of the ASR, due to their ability to reduce the solution surface tension and the contact angle of ASR. Urethane foam is a bulky compound in ASR and its immersion and wetting behavior showed similar changes as those of the ASR samples. With SDS the surface wettability of urethane was improved. The surfactant solutions were also effective in the detachment of the entrapped particles from the agglomerate of entangling fiber like materials. The effects of the surfactant concentrations on ASR wettability and the amount of detached particles are described.

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Technological Developments in Wet Gravity Separation Processes

Cited by 6 publications

References 12 publications

Jig separation of crushed automobile shredded residue and its evaluation by float and sink analysis

Jig separation of crushed automobile shredded residue and its evaluation by float and sink analysis

Development of a New Gravity Separator for Plastics —a Hybrid-Jig—

Immersion Behavior of Automobile Shredded Residue in Surfactant Solutions and Detachment of Particulate Matter

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Technological Developments in Wet Gravity Separation Processes

Cited by 6 publications

References 12 publications

Jig separation of crushed automobile shredded residue and its evaluation by float and sink analysis

Jig separation of crushed automobile shredded residue and its evaluation by float and sink analysis

Development of a New Gravity Separator for Plastics &mdash;a Hybrid-Jig&mdash;

Immersion Behavior of Automobile Shredded Residue in Surfactant Solutions and Detachment of Particulate Matter

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Development of a New Gravity Separator for Plastics —a Hybrid-Jig—