点击次数：

论文类型：期刊论文

发表时间：2015-05-03

发表刊物：ENVIRONMENTAL TECHNOLOGY

收录刊物：PubMed、SCIE、Scopus

卷号：36

期号：9

页面范围：1098-1103

ISSN号：0959-3330

关键字：waste recycling; glass-ceramic; melting/sintering; incinerated sewage sludge ash; heavy metal

摘要：In this paper, the recycling of incinerated sewage sludge ash (ISSA) into glass-ceramic materials by a two-stage sintering cycle of nucleation stage and crystallization stage without any pressure and binder is presented. The parent glasses were subjected to the following nucleation/crystallization temperature and time level: (A) 790 degrees C, 1.0 h/870 degrees C, 1.0-3.0 h; (B) 790 degrees C, 1.0 h/945 degrees C, 1.0-3.0 h and (C) 790 degrees C, 1.0 h/1065 degrees C, 1.0-3.0 h. X-ray power diffraction analysis results revealed that multiple crystalline phases coexisted in the glass-ceramic materials and the crystalline phase compositions were more affected by crystallization temperature than crystallization time. Scanning electron microscopy analysis showed an interlocking microstructure of glass phases and crystals with different sizes and spatial distribution. The glass-ceramics crystallized at 945 degrees C for 2.0 h exhibited optimal properties of density of 2.88 +/- 0.08 g/cm(3), compression strength of 247 +/- 12 MPa, bending strength of 118 +/- 14 MPa and water absorption of 0.42 +/- 0.04. The leaching concentrations of heavy metals were far lower than the limits required by the regulatory standard of EPA. This paper provides a feasible, low-cost and promising method to produce ISSA-based glass-ceramics and highlights the principal characteristics that must be taken into account to use ISSA correctly in glass-ceramics.