Glass-ceramics made from arc-melting slag of waste incineration fly ash

来源期刊:中南大学学报(英文版)2011年第6期

论文作者:刘汉桥 魏国侠 梁茵 董飞英

文章页码:1945 - 1952

Key words:waste incineration fly ash; arc-melting; glass-ceramics; crystallization behavior

Abstract: Grate fly ash and fluidized bed fly ash mixed with glass cullet additive respectively were melted in the electronic arc-furnace. The product, arc-melting slag, was further treated by crushing, pressing and heat treatment in order to make the glass-ceramics. The crystallization behaviors of the produced glass-ceramics were examined by differential thermal analysis (DTA), X-ray diffractometry (XRD) and scanning electron microscopy (SEM).Results show that main crystalline phase of the glass-ceramics from grate fly ash is wollastonite (CaSiO3) with small amount of diopside (Ca(Mg,Al)(Si,Al)2O6), and that from fluidized bed fly ash is diopside (Ca(Mg,Al)(Si,Al)2O6). It is found that the glass-ceramics sintered at 850℃ and 1000℃ from grate fly ash and fluidized bed fly ash respectively have the optimal physical, mechanical and chemical characteristics. Glass-ceramics samples, produced from incinerator fly ash with desirable properties and the low leaching concentration of heavy metals, can be the substitute of nature materials such as marble, granite and porcelain tiles.

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