Development of a New Gravity Separator for Plastics -a Hybrid-Jig
Development of a New Gravity Separator for Plastics -a Hybrid-Jig
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DOI：
10.2320/matertrans.m-m2009825
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发表时间：
2009-12-01
影响因子：
1.2
通讯作者：
Okada, Hideaki
中科院分区：
文献类型：
--
作者：
Hori, Kunihiro;Tsunekawa, Masami;Okada, Hideaki
塑料-塑料分离的机械方法的发展对于回收办公/家用电器和汽车的废弃塑料是重要的。本文提出了一种新的塑料分离方法--混合式跳汰机。混合跳汰机是在跳汰和浮选的基础上发展起来的。在跳汰过程中，在颗粒床中引入气泡，通过气泡附着在颗粒上来改变颗粒的表观比重，从而使具有不同表面性质的颗粒即使在比重相似的情况下也能通过跳汰分离。为了演示混合跳汰机的性能，对实验室规模的TACUB跳汰机进行改进，以通过颗粒床下的筛网引入气泡。在不同的水脉动位移和频率下进行了塑料颗粒混合物的分离实验。进料样品是从八种塑料（3种聚氯乙烯（PVC）、4种聚乙烯（PE）和1种聚对苯二甲酸乙二醇酯（PET））中选择的两种塑料的颗粒混合物。颗粒为圆柱形，长2-3 mm，直径2 - 3 mm，其比重为1.05- 1.55（无气泡）时，比重相近的塑料颗粒难以分离，但当气泡吸附在疏水性更强的塑料表面时，并且由于表观比重的降低，具有气泡的塑料颗粒作为顶部产物被回收。因为塑料的疏水性的差异导致选择性气泡附着，即使对于具有相同比重的塑料混合物，通过混合跳汰机回收超过99.9质量%的高级塑料产品。[doi：10.2320/材料trans.M-M2009825]
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 it 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 tinder 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. [doi:10.2320/matertrans.M-M2009825]