Cho Soo-Jin, Jang Ha-Na, Cho Sung-Jin, Yoon Young-Sam, Yoo Heung-Min
Resource Recirculation Research Division, National Institute of Environmental Research, Incheon 22689, Republic of Korea.
Department of Environmental Finance, Yonsei University, Wonju 26493, Republic of Korea.
Materials (Basel). 2023 Mar 27;16(7):2664. doi: 10.3390/ma16072664.
The quantity of waste from end-of-life vehicles is increasing with an increase in the number of scrapped internal combustion engine vehicles owing to international trends such as carbon neutrality and particulate matter reduction. The recycling rate must be ≥95%; however, the average recycling rate remains at approximately 89%. Therefore, the improvement of the recycling of automobile shredder residues (ASR) is gaining attention. In this study, four types of products (interlocking, clay, and lightweight swelled ceramic (LSC) bricks, and asphalt paving aggregate (APA)) were manufactured using ASR melting slag (ASRMS). Environmental performance, quality standards, and technology were evaluated to assess the recyclability of the manufactured bricks. The interlocking brick substituted melting slag for sand and stone powder as an aggregate. As melting slag content increased, absorption decreased and bending strength increased. Clay brick was manufactured by replacing kaolin and feldspar with melting slag that substituted for 20%. The quality of clay bricks mixed with over 15% melting slag was not better than standard. Asphalt paving aggregate was used to investigate the optimum condition of slag content in mixed asphalt; the mixture ratio showed that 61% broken stone of 13 mm, 6% screenings, 10% melting slag, 15% sand and 8% filler was most effective. A lightweight swelled ceramic brick was manufactured by using melting slag, front glass, and so on. Specific gravity and compressive strength ranged from 0.38 to 0.51 and from 339.7 to 373.6 N/cm. ASRMS exhibited an environmental performance suitable for recycling and the manufactured bricks satisfied the quality standards. The recyclability of ASR was also assessed in terms of waste usage, conformance to quality standards, market size, and demand prediction. APA showed the best results followed by interlocking, clay, and LSC bricks.
由于碳中和和颗粒物减排等国际趋势，报废内燃机车辆数量增加，报废汽车产生的废弃物数量也在上升。回收率必须≥95%；然而，平均回收率仍约为89%。因此，提高汽车 shredder 残渣（ASR）的回收率受到关注。在本研究中，使用ASR 熔渣（ASRMS）制造了四种产品（联锁砖、粘土砖、轻质膨胀陶瓷（LSC）砖和沥青铺路集料（APA））。对环境性能、质量标准和技术进行了评估，以评估所制造砖块的可回收性。联锁砖用熔渣替代沙子和石粉作为集料。随着熔渣含量增加，吸水率降低，抗弯强度增加。粘土砖是通过用熔渣替代20%的高岭土和长石制成的。熔渣含量超过15%的粘土砖质量并不优于标准。沥青铺路集料用于研究混合沥青中矿渣含量的最佳条件；混合比例表明，13毫米碎石61%、筛屑6%、熔渣10%、沙子15%和填料8%的混合比例最有效。轻质膨胀陶瓷砖是用熔渣、前玻璃等制成的。比重和抗压强度范围分别为0.38至0.51和339.7至373.6 N/cm²。ASRMS表现出适合回收的环境性能，所制造的砖块符合质量标准。还从废物利用、符合质量标准、市场规模和需求预测等方面评估了ASR的可回收性。APA显示出最佳结果，其次是联锁砖、粘土砖和LSC砖。
