Flotation separation of plastics using selective depressants

Shibata, Junji; Matsumoto, Shoki; Yamamoto, Hideki; Kusaka, Eishi; Pradip,

doi:10.1016/s0301-7516(96)00021-x

Cited by 73 publications

(24 citation statements)

References 3 publications

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“…Later, Shibata et al [13,14] successfully separated four different types of plastics, namely polyvinyl chloride (PVC), polycarbonate (PC), polyacetal (POM) and polyphenylene (PPE), using common wetting reagents like sodium ligninsulfonate, tannic acid, Aerosol OT and saponin. At first, floatability of individual plastics was measured by means of column flotation in the presence of various depressants, and a three-step process was then developed.…”

Section: Wet Separating Techniques For Separating Plasticsmentioning

confidence: 99%

Progress in Separating Plastic Materials for Recycling

Dodbiba

Fujita

2004

Physical Separation in Science and Engineering

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In order to deal with the problems facing the plastics processing industry research, work is focused primarily on designing, developing and testing a variety of separation and sorting techniques able to recover plastics from wastes, which can be re-used or re-processed to form new products. In this regard, technologies developed in mineral processing can be of great help. Various techniques for separating plastics materials have been recently developed. These techniques can be divided in two main categories, i.e. wet separating techniques and dry separating techniques. This paper presents the recent progress in separating plastics reviewing the potential of the available techniques.

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Section: Wet Separating Techniques For Separating Plasticsmentioning

confidence: 99%

Progress in Separating Plastic Materials for Recycling

Dodbiba

Fujita

2004

Physical Separation in Science and Engineering

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“…Recently, flotation is also practiced in other recycling or environmental fields such as plastics separation and recycling 3) , deinking of printed paper 4) , separation or harvesting of micro-organisms 5,6) , harvesting or removal of algae 7) . Unlike in mineral processing, the particles which are subject to a flotation process especially in environmental applications usually include organic substances.…”

Section: Introductionmentioning

confidence: 99%

Flotation of Starch with Anionic, Cationic, and Nonionic Collector -Fundamental Study on the Removal of Organic Matters from Wastewater-

Kusaka

Yokoi

2008

Resources Processing

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Flotation experiments of potato starch particle with several collectors; sodium dodecylsulfate and sodium oleate as anionic collectors, sorbitan monolaurate as a nonionic collector and dodecylammonium and dodecyltrimethylammonium salts as cationic collectors, were carried out. With anionic and nonionic collectors, good floatability was not observed, whereas the starch particles were successfully recovered with cationic collectors. The results indicated that the surface hydrophilic/hydrophobic property of the starch particle could be modified with cationic collectors.The result of microelectrophoretic measurement showed that the surface of the starch particle is negatively charged in water, and therefore, cationic collector adsorbs electrostatically onto the starch particle. The results of adsorption experiment showed that neutral amine molecules adsorbed onto the starch surface and/or absorbed into the starch particle. It was suggested that capillary condensation or similar phenomena stripped neutral molecules from the water phase.

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“…Flotation, [2][3][4][5] and sink-float 6,7) separation techniques are well known wet methods for plastic separation. Otherwise, electrostatic separation, a dry separation technique that utilizes the electrical charging of particles, has been mainly developed for the mineral beneficiation.…”

Section: Introductionmentioning

confidence: 99%

Triboelectrostatic Separation of ABS, PS and PP Plastic Mixture

et al. 2003

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The objective of this study was to triboelectrostatically separate artificial plastic mixture of three kinds of components (i.e. ABS, PS and PP mixture). The mixture is charged by friction in tribo-cyclone. After a given period of time inside the tribo-cyclone, the charged plastic flakes fell down freely through a horizontal electric field into collection bins. The DC electric field of maximum 400 kV/m is created by using two parallel plate electrodes made of Cu and having a given cross-section configuration. The plastic flakes of the mixtures are drawn to either positive or negative electrode according to the polarity of the charge and are separated by falling in different bins. The purification of three-component mixture is accomplished by a two-step triboelectrostatic process. Separation tests in a batch laboratory triboelectrostatic separator showed that the efficiency of the separation is strongly depended on tribocharging time, air inlet velocity, and electric field strength. Products of ABS, PS and PP with a grade of 92.1%, 84.9% and 90.0% respectively have been achieved with recoveries above 73.0%.

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Flotation separation of plastics using selective depressants

Cited by 73 publications

References 3 publications

Progress in Separating Plastic Materials for Recycling

Progress in Separating Plastic Materials for Recycling

Flotation of Starch with Anionic, Cationic, and Nonionic Collector -Fundamental Study on the Removal of Organic Matters from Wastewater-

Triboelectrostatic Separation of ABS, PS and PP Plastic Mixture

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