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首页> 外文期刊>Journal of Solid Waste Technology and Management >STUDIES UTILIZING HIGH TEMPERATURE FEEDING RECYCLE RESOURCES ULTRA-LIGHT AGGREGATE
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STUDIES UTILIZING HIGH TEMPERATURE FEEDING RECYCLE RESOURCES ULTRA-LIGHT AGGREGATE

机译：利用高温供料循环资源超轻集料的研究

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摘要

Artificial ultra-lightweight aggregate (ULWA) manufactured from recycled resources was investigated. Residues from mining, fly ash from incinerator and heavy metal sludge from electronic waste were mixed into raw aggregate pellets and fed into a plow-type tunnel kiln to be sintered and finally cooled rapidly. Various feeding and sintering temperatures were employed to examine their impact on the extent of vitrification on the aggregate surface. Microstructural analysis and toxicity characteristic leaching procedure (TCLP) were also performed. Our results show that the optimum condition of ULWA fabrication is sintering at 1150℃ for 15 min with raw aggregate pellets fed at 750°C. The rapidly vitrified surface envelops the gas produced with the increase in internal temperature and cooling by spraying water to prevent the aggregates from binding together, thus forming ULWA with specific gravity below 0.5. ULWA produced by sintering shows good vitrified surface, water absorption below 10% and high cylindrical compres-sive strength. In addition, only trace amounts of heavy metals were detected, making the ULWA non-hazardous for construction use. With sintering time reduced to within 20 min, ULWA can be manufactured in larger quantity and shorter time, promising an alternative for profitable resource recycling and efficient waste management.
机译：研究了利用再生资源制造的人造超轻集料（UL​​WA）。将采矿的残渣，焚烧炉产生的粉煤灰和电子废物产生的重金属污泥混合成粗骨料颗粒，然后送入犁式隧道窑进行烧结，最后迅速冷却。使用各种进料和烧结温度来检查它们对骨料表面玻璃化程度的影响。还进行了微结构分析和毒性特征浸出程序（TCLP）。我们的结果表明，制造ULWA的最佳条件是在750°C下进料，在1150℃烧结15分钟。快速玻璃化的表面将内部温度升高产生的气体包裹起来，并通过喷水冷却以防止聚集体结合在一起，从而形成比重低于0.5的ULWA。烧结生产的ULWA表现出良好的玻璃化表面，低于10％的吸水率和高圆柱抗压强度。此外，仅检测到痕量的重金属，因此ULWA对建筑用途无害。将烧结时间缩短至20分钟以内，可以生产大量，更短的ULWA，有望成为有利可图的资源回收和有效废物管理的替代方法。

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