Preparation of Foamed Ceramics from Granite Scrap and Marble Scrap

Abstract

Abstract: To achieve the goal of “double carbon”and promote the resource utilization of bulk solid waste,the method and theory of coordinated preparation of foamed ceramics materials by various solid wastes were developed and explored. Foamed ceramics with high closed porosity were prepared by sintering at high temperature with granite scrap and marble scrap as main raw materials and SiC as foaming agent. The effects of raw material ratio, sintering temperature and foaming agent content on the pore structure and properties of foamed ceramics were investigated. The results show that at high temperature, CaO decomposed from the CaCO₃ component in marble scrap is an effective flux that destroys the Si—O bond, reduces viscosity of liquid phase and promotes smooth foaming. Meanwhile, CaO can react with SiO₂ to form wollastonite, which improves compressive strength of material. The foamed ceramics have the most favorable uniform pore structure and overall performance when the sintering temperature is 1 130 ℃, the marble scrap mass content is 10% and the SiC mass content is 1.0%, with the closed porosity of 79.16%, the bulk density of 583.42 kg/m³, the compressive strength of 3.86 MPa and the water absorption rate of 0.40%. This study provides a theoretical foundation for the preparation of foamed ceramics by recycling granite scrap and marble scrap.

Key words: foamed ceramics, granite scrap, marble scrap, silicon carbide, high-temperature sintering, solid waste utilization

CLC Number:

TQ174

DONG Yiran, ZHAO Chenglin, GUO Wei, JIANG Congcong, HUANG Shifeng, CHENG Xin. Preparation of Foamed Ceramics from Granite Scrap and Marble Scrap[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 939-947.

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