|Title:||Production of lightweight aggregates from mining residues, heavy metal sludge, and incinerator fly ash||Authors:||Huang, Su-Chen
|Keywords:||Artificial lightweight aggregate; Compressive strength; Heavy metal; Recycling; SEM||Issue Date:||2007||Journal Volume:||144||Journal Issue:||44563||Start page/Pages:||52-58||Source:||Journal of Hazardous Materials||Abstract:||
In this study, artificial lightweight aggregate (LWA) manufactured from recycled resources was investigated. Residues from mining, fly ash from an incinerator and heavy metal sludge from an electronic waste water plant were mixed into raw aggregate pellets and fed into a 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. The results show that the optimum condition of LWA fabrication is sintering at 1150 °C 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 prevents the aggregates from binding together, thus forming LWA with specific gravity of 0.6. LWA produced by sintering in tunnel kiln shows good vitrified surface, low water absorption rate below 5%, and low cylindrical compressive strength of 4.3 MPa. In addition, only trace amounts of heavy metals were detected, making the LWA non-hazardous for construction use. © 2006 Elsevier B.V. All rights reserved.
Aggregates; Compressive strength; Microstructure; Scanning electron microscopy; Sintering; Toxicity; Artificial lightweight aggregate; Toxicity characteristic leaching procedure (TCLP); Water absorption rate; Wastewater; heavy metal; water; Aggregates; Compressive strength; Microstructure; Scanning electron microscopy; Sintering; Toxicity; Wastewater; absorption; aggregate; compressive strength; fly ash; heavy metal; incineration; leaching; microstructure; mining; recycling; scanning electron microscopy; sludge; toxicity; vitrification; wastewater; article; chemical structure; cooling; electronics; feeding behavior; fly ash; gas analysis; gravity; incineration; mining; nonhuman; plant water content; sludge; temperature sensitivity; waste water; water absorption; Aluminum Silicates; Bentonite; Carbon; Conservation of Natural Resources; Construction Materials; Electronics; Heat; Incineration; Industrial Waste; Metals, Heavy; Mining; Particulate Matter; Sewage; Waste Management
|Appears in Collections:||環境工程學研究所|
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