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Preparation of porous glass-ceramics from coal fly ash and asbestos tailings by high-temperature pore-forming
Waste Management ( IF 8.1 ) Pub Date : 2020-03-28 , DOI: 10.1016/j.wasman.2020.03.008
Li Zeng , Hongjuan Sun , Tongjiang Peng , Wenmiao Zheng

This paper presented a new method of preparing porous glass-ceramics by high-temperature pore-forming using coal fly ash and asbestos tailings as raw materials. The effects of the content of asbestos tailings and sintering temperature on the phase composition, microstructure and properties of the porous glass-ceramics had been systematically discussed, furthermore, the pore formation mechanism was also expounded. Compared with T0, porous glass-ceramics from T1, T2 and T3 experienced more violent self-expansion during the sintering process due to the addition of asbestos tailings. The porosity of porous glass-ceramics from T3 was 51%, the bulk density was 1.42 g/cm3, the flexure strength was 19 MPa, the main crystal phase was indialite, along with several secondary phases such as anorthite, enstatite, and forsterite. Due to the high strength, the material was expected to be used as a porous construction material with load-bearing function. This work provided a convenient and promising method for the utilization of coal fly ash and asbestos tailings to prepare porous glass-ceramics without adding foaming agents.



中文翻译:

利用粉煤灰和石棉尾矿的高温成孔法制备多孔微晶玻璃

本文提出了一种以粉煤灰和石棉尾矿为原料,高温成孔制备多孔微晶玻璃的新方法。系统地讨论了石棉尾矿含量和烧结温度对多孔玻璃陶瓷相组成,微观结构和性能的影响,并阐述了孔形成机理。与T0相比,由于添加了石棉尾矿,来自T1,T2和T3的多孔玻璃陶瓷在烧结过程中经历了更剧烈的自膨胀。从T3开始的多孔玻璃陶瓷的孔隙率为51%,堆积密度为1.42g / cm 3。,弯曲强度为19 MPa,主晶相为辉绿岩,以及若干次生相,如钙长石,顽辉石和镁橄榄石。由于高强度,该材料有望用作具有承重功能的多孔建筑材料。这项工作为利用粉煤灰和石棉尾矿制备多孔玻璃陶瓷而不添加发泡剂提供了方便而有希望的方法。

更新日期:2020-03-28
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