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论文类型：期刊论文

发表时间：2015-04-01

发表刊物：WASTE MANAGEMENT

收录刊物：SCIE、EI、PubMed、Scopus

卷号：38

期号：1

页面范围：185-193

ISSN号：0956-053X

关键字：Glass ceramic composite; Heavy metals; MSWI bottom ash; Oil shale fly ash; Sintering; Vitrification

摘要：Oil shale fly ash and municipal solid waste incineration bottom ash are industrial and municipal by-products that require further treatment before disposal to avoid polluting the environment. In the study, they were mixed and vitrified into the slag by the melt-quench process. The obtained vitrified slag was then mixed with various percentages of oil shale fly ash and converted into glass ceramic composites by the subsequent sintering process. Differential thermal analysis was used to study the thermal characteristics and determine the sintering temperatures. X-ray diffraction analysis was used to analyze the crystalline phase compositions. Sintering shrinkage, weight loss on ignition, density and compressive strength were tested to determine the optimum preparation condition and study the co-sintering mechanism of vitrified amorphous slag and oil shale fly ash. The results showed the product performances increased with the increase of sintering temperatures and the proportion of vitrified slag to oil shale fly ash. Glass ceramic composite (vitrified slag content of 80%, oil shale fly ash content of 20%, sintering temperature of 1000 degrees C and sintering time of 2 h) showed the properties of density of 1.92 +/- 0.05 g/cm(3), weight loss on ignition of 6.14 +/- 0.18%, sintering shrinkage of 22.06 +/- 0.6% and compressive strength of 67 +/- 14 MPa. The results indicated that it was a comparable waste-based material compared to previous researches. In particular, the energy consumption in the production process was reduced compared to conventional vitrification and sintering method. Chemical resistance and heavy metals leaching results of glass ceramic composites further confirmed the possibility of its engineering applications. (C) 2015 Elsevier Ltd. All rights reserved.