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首页> 外文期刊>Waste management & research >Report: Recycling of flame-retarded plastics from waste electric and electronic equipment (WEEE)
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Report: Recycling of flame-retarded plastics from waste electric and electronic equipment (WEEE)

机译：报告：从废弃的电气和电子设备（WEEE）中回收阻燃塑料

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摘要

Shredder residues produced in plants processing waste electric and electronic equipment are excluded from material recycling due to a variety of polymeric materials and the presence of brominated flame retardants (BFR), which might contain banned polybrominated diphenyl ethers or toxic polybromi-nated dioxins and furans (PBDD/F). Herein we present a technological approach to transfer a significant portion of the shredder residue into recycled polymers. The technological approach consists of a density-based enrichment of styrenics, which are subjected to a solvolysis process (CreaSolv process) in a second stage. This stage allows the elimination of non- target polymers and extraction of BFR and PBDD/F. Pilot processing of 11.5 and 50 kg shredder residues indicated a material yield of about 50 percent in the density stage and 70-80 percent in the CreaSolv~R process, and an effective removal of BFR additives. The recycled products were proved to comply with threshold values defined by the European directive on the restriction of hazardous substances (RoHS) and the German Chemikalienverbotsverordnung. Mechanical material properties exhibited high tensile and flexural modules as well as slight impact strength, which qualify the products for applications in new electronic equipment.
机译：由于各种聚合材料以及溴化阻燃剂（BFR）的存在，溴化阻燃剂（BFR）可能含有禁用的多溴代二苯醚或有毒的多溴代二恶英和呋喃，因此，在处理废旧电气和电子设备的工厂中产生的切碎残渣不包括在材料循环利用中（ PBDD / F）。本文中，我们介绍了一种技术方法，可将大部分碎纸机残留物转移到回收的聚合物中。该技术方法包括对苯乙烯进行基于密度的富集，然后在第二阶段对其进行溶剂分解过程（CreaSolv过程）。该阶段可以消除非目标聚合物并提取BFR和PBDD / F。对11.5和50公斤切碎机残渣进行的先导处理表明，在密度阶段的材料收率约为50％，在CreaSolv〜R过程中的材料收率约为70-80％，并能有效去除BFR添加剂。经证明，回收的产品符合欧洲有害物质限制（RoHS）指令和德国Chemikalienverbotsverordnung规定的阈值。机械材料性能显示出高拉伸和挠曲模量以及轻微的冲击强度，这使该产品可用于新的电子设备。

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