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论文类型：期刊论文

发表时间：2010-01-15

发表刊物：JOURNAL OF HAZARDOUS MATERIALS

收录刊物：SCIE、EI、PubMed、Scopus

卷号：173

期号：1-3

页面范围：427-432

ISSN号：0304-3894

关键字：Glass-ceramics; Oil shale fly ash; Alkalinity; Crystalline phase

摘要：Nucleated glass-ceramics materials were produced from oil shale fly ash obtained from Huadian thermal power plant in China with the addition of analytic reagent CaO. On basis of differential thermal analysis (DTA) results, the nucleation and crystallization temperature of two parent glass samples with different alkalinity (Ak = m(CaO)/m(SiO2)) were identified as Tn(1) = 810 degrees C, Tc(1) = 956 degrees C and Tn(2) = 824 degrees C, Tc(2) = 966 degrees C, respectively. X-ray diffraction (XRD) analysis of the produced nucleated glass-ceramics materials revealed that there was a coexistence phenomenon of multi-crystalline phase and the main crystalline phase was anorthite ([Ca,Na][Al,Si](2)Si(2)O(8)). The microstructure of the glass-ceramics materials was examined by scanning electron microscope (SEM). SEM observation indicated that there was an increase in the quantity of sphere-shaped crystals when crystallization time increased. Furthermore, the increase of alkalinity caused more amorphous phase occurring in glass-ceramics materials. Through the tests of physical and mechanical properties, the glass-ceramics materials with more crystalline phase and fine microstructure had high density, fine performance of resisting compression (328.92 MPa) and negligible water absorption. Through chemical resistance tests, the glass-ceramics samples showed strong corrosion resistance. Overall results indicated that it was a feasible attempt to produce nucleated glass-ceramics materials for building and decorative materials from oil shale fly ash. (C) 2009 Elsevier B.V. Al I rights reserved.