Cite this article as: |
Junjie Zhang, Xiaoyan Zhang, Bo Liu, Christian Ekberg, Shizhen Zhao, and Shengen Zhang, Phase evolution and properties of glass ceramic foams prepared by bottom ash, fly ash and pickling sludge, Int. J. Miner. Metall. Mater., 29(2022), No. 3, pp. 563-573. https://doi.org/10.1007/s12613-020-2219-5 |
张笑妍 E-mail: xiaoyanzhang666@163.com
刘波 E-mail: liubo@ustb.edu.cn
张深根 E-mail: zhangshengen@mater.ustb.edu.cn
底灰、粉煤灰和酸洗污泥给城市带来了严重的环境污染,以其为原料制备泡沫微晶玻璃是实现固体废物资源化利用,降低环境影响的有效途径。本文以碳酸钙为发泡剂协同处置以上三种固体废弃物,成功制备了泡沫微晶玻璃。不同底灰添加量对样品的孔形态、孔径分布、孔内外成分变化、物理性能、玻璃结构单元、物相及析晶的影响得到了分析。结果表明,随底灰添加量增加,玻璃相,Si–O–Si及Q3Si单元逐渐减少,玻璃转变温度降低,从而造成气泡融合及孔分布不均的现象。当底灰、粉煤灰、酸洗污泥添加量分别35wt%,45wt%和20wt%时,制备了具有均匀球形孔隙和优异物理性能的泡沫微晶玻璃。样品的体积密度为1.76 g/cm3,孔隙率达56.01%,抗压强度为16.23 MPa。这种低成本制备泡沫微晶玻璃的方法为协同处置固体废弃物提供了新思路。
Municipal solid waste incineration products of bottom ash (BA), fly ash (FA), and pickling sludge (PS), causing severe environmental pollution, were transformed into glass ceramic foams with the aid of CaCO3 as a pore-foaming agent during sintering. The effect of the BA/FA mass ratio on the phase composition, pore morphology, pore size distribution, physical properties, and glass structure was investigated, with results showing that with the increase in the BA/FA ratio, the content of the glass phase, Si–O–Si, and Q3Si units decrease gradually. The glass transmission temperature of the mixture was also reduced. When combined, the glass viscosity decreases, causing bubble coalescence and uneven pore distribution. Glass ceramic foams with uniform spherical pores are fabricated. When the content of BA, FA, and PS are 35wt%, 45wt%, and 20wt%, respectively, contributing to high performance glass ceramic foams with a bulk density of 1.76 g/cm3, porosity of 56.01%, and compressive strength exceeding 16.23 MPa. This versatile and low-cost approach provides new insight into synergistically recycling solid wastes.
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