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首页> 外文期刊>Clean technologies and environmental policy >Characterization and recycling of the fine fraction of automotive shredder residue (ASR) for concrete paving blocks production
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Characterization and recycling of the fine fraction of automotive shredder residue (ASR) for concrete paving blocks production

机译：用于混凝土铺路砌块的汽车粉碎机残留物（ASR）的焦点表征及回收

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摘要

Shredder is the equipment used for ferrous scrap grinding that enables the recycling of steel in steel mills. The scrap is mostly originated from end-of-life vehicles (ELV).Therefore, this residue is known as automotive shredder residue (ASR). Throughout the world, is estimated that more than 25 million vehicles turn into an ELV every year, and most of their resources end up in landfill. Occasionally, hazardous substances may appear on the Shredder waste, which are very heterogeneous as a result of the variety of material fed into the equipment. Thus, Shredder waste has become a worldwide problem due to its environmental impact, heterogeneous composition and its recycling has been a challenge. Therefore, this manuscript addresses the characterization of the fine fraction of ASR generated in a plant located in Brazil. It is also proposed its recycling in concrete paving blocks to replace the natural fine aggregate through the Portland cement solidification/stabilization (S/S) technique. S/S prevents the release of hazardous chemicals from waste. As a result, with a 20% substitution content of the fine sand for the waste, 6 out 8 toxic elements presented in the residue were encapsulated by cement (total phenol, total iron, fluorettes, manganese, selenium, surfactants) and reached the required by the Brazilian standard. The two non-encapsulated elements were aluminum, whose concentration showed a 62.5% decrease, and cadmium, which is also found in conventional blocks. The concrete paving blocks showed good mechanical and physical performance. Therefore, the concrete paving block produced could be used as a potential solution for the mitigation of the environmental impact caused by the fine fraction of ASR waste.
机译：碎纸机是用于黑色金属废料研磨的设备，可在钢厂中钢材回收。废料主要来自寿命终端（ELV）。因此，这种残留物称为汽车粉碎机残留物（ASR）。据估计，据估计，每年有超过2500万辆的车辆变成壮丽州，而且他们的大部分资源都在垃圾填埋场中最终成为垃圾填埋场。偶尔，粉碎机废物可能出现有害物质，这是由于各种材料进入设备的材料而非常异质。因此，由于其环境影响，异质组成及其回收是粉碎的，粉碎机已经成为全球问题。因此，该稿件解决了位于巴西的植物中产生的ASR的细分分数的表征。它还提出其在混凝土铺路块中的回收，以通过波特兰水泥凝固/稳定（S / S）技术代替天然精细聚集体。 S / S防止浪费危险化学品。结果，通过用于废物的细砂20％的取代含量，通过水泥（总酚，总铁，荧光，锰，硒，表面活性剂）包封6输出8个有毒元素，并达到所需的巴西标准。两种非包封的元素是铝，其浓度显示为62.5％的降低和镉，其也存在于常规嵌段中。混凝土铺路块显示出良好的机械和物理性能。因此，产生的混凝土铺路块可用作减轻由ASR废物的细分分数引起的环境影响的潜在解决方案。

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