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Research Article

Phase evolution and properties of glass ceramic foams prepared by bottom ash, fly ash and pickling sludge

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  • Received: 17 July 2020Revised: 29 October 2020Accepted: 2 November 2020Available online: 4 November 2020
  • Municipal solid waste incineration 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 the pore-foaming agent by sintering in this paper. The effect of BA/FA ratio on the phase composition, pore morphology, pore size distribution, physical properties, glass structure unit of the samples was investigated, with results showing that with the increase of BA/FA ratio, the content of glass phase, Si-O-Si and Q3Si units decrease gradually. The glass transmission temperature of the mixture has also been reduced. These leads to the decrease of the glass viscosity, further causing bubble coalescence and uneven pore distribution. Glass ceramic foams with uniform spherical pores (average pore size of 106 μm) would be fabricated, when the content of BA, FA and PS were 35wt%, 45wt% and 20wt% respectively, contributing to the glass ceramic foams of high performance with bulk density of 1.76 g/cm3, porosity of 56.01% and compressive strength exceeding 16.23 MPa. This versatile and low-cost approach brings new insight of synergistically recycling solid wastes.
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Phase evolution and properties of glass ceramic foams prepared by bottom ash, fly ash and pickling sludge

  • Corresponding authors:

    Xiao-yan Zhang    E-mail: xiaoyanzhang666@163.com

    Bo Liu    E-mail: liubo@ustb.edu.cn

    Shen-gen Zhang    E-mail: zhangshengen@mater.ustb.edu.cn

  • 1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
  • 2. Nuclear Chemistry and Industrial Material Recycling, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg 41296, Sweden

Abstract: Municipal solid waste incineration 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 the pore-foaming agent by sintering in this paper. The effect of BA/FA ratio on the phase composition, pore morphology, pore size distribution, physical properties, glass structure unit of the samples was investigated, with results showing that with the increase of BA/FA ratio, the content of glass phase, Si-O-Si and Q3Si units decrease gradually. The glass transmission temperature of the mixture has also been reduced. These leads to the decrease of the glass viscosity, further causing bubble coalescence and uneven pore distribution. Glass ceramic foams with uniform spherical pores (average pore size of 106 μm) would be fabricated, when the content of BA, FA and PS were 35wt%, 45wt% and 20wt% respectively, contributing to the glass ceramic foams of high performance with bulk density of 1.76 g/cm3, porosity of 56.01% and compressive strength exceeding 16.23 MPa. This versatile and low-cost approach brings new insight of synergistically recycling solid wastes.

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