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    National Tsing Hua University Institutional Repository > 原子科學院  > 生醫工程與環境科學系 > 期刊論文 >  Production of lightweight aggregates from mining residues, heavy metal sludge, and incinerator fly ash


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/61829


    Title: Production of lightweight aggregates from mining residues, heavy metal sludge, and incinerator fly ash
    Authors: Huang, Su-Chen;Chang, Fang-Chih;Lo, Shang-Lien;Lee, Ming-Yu;Wang, Chu-Fang;Lin, Jyh-Dong
    教師: 王竹方
    Date: 2007
    Publisher: Elsevier
    Relation: Journal of Hazardous Materials, Volume 144, Issues 1-2, Pages 52-58
    Keywords: artificial lightweight aggregate
    recycling
    heavy metal
    compressive strength
    SEM
    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 degrees C for 15 min with raw aggregate pellets fed at 750 degrees 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.
    URI: http://www.elsevier.com/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/61829
    Appears in Collections:[生醫工程與環境科學系] 期刊論文

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