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Some Aspects of the Thermochemical Route for the Valorization of Plastic Wastes Part I: Reduction of Iron Oxides by Polyvinyl Chloride (PVC)

机译:塑料废物储存的热化学途径的一些方面第一部分:通过聚氯乙烯(PVC)减少铁氧化物

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摘要

The mass production of synthetic plastics began in the last century and today they have become one of the most abundant man-made materials. The disposal or the beneficiation of end-of-life plastics represent a great challenge for society especially in the case of polyvinyl chloride (PVC). This study is focused on the use of PVC waste as a useful agent for the direct reduction of hematite (Fe2O3) after a thermal treatment at 300 °C for removing the chlorine contained in PVC. Thermal reduction tests were conducted from 600 °C to 1100 °C with (Fe2O3 + PVC + clay) pellet mixtures in which clay was used as plasticizing and binder agent of the pellets. The starting samples and treatment residues were analyzed by scanning electron microscopy through energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction (XRD) to monitor the chemical behavior and reactivity of the pellet constituents during their thermal treatment. The stepwise reduction of hematite up to metallic iron was achieved at temperatures approaching 1000 °C, confirming the capability of using PVC waste for the direct reduction of iron oxides.
机译:综合塑料的批量生产始于上世纪,今天他们已成为最丰富的人造材料之一。寿命结束塑料的处置或益处代表了对社会的巨大挑战,特别是在聚氯乙烯(PVC)的情况下。该研究专注于在300℃下热处理后直接减少赤铁矿(Fe 2 O 3)的有用药剂的研究,以除去PVC中含有的氯。热还原试验用600℃至1100℃进行(Fe 2 O 3 + PVC +粘土)颗粒混合物,其中粘土用作颗粒的塑化和粘合剂。通过通过能量分散光谱(SEM-EDS)和X射线衍射(XRD)通过扫描电子显微镜和X射线衍射(XRD)来分析起始样品和处理残留物,以监测其热处理期间颗粒成分的化学行为和反应性。在接近1000℃的温度下逐步减少到金属铁,确认使用PVC废物直接减少铁氧化物的能力。

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