Feasibility Study on Preparation of Foamed Ceramics Lightweight Wall Materials from Granite Scrap
To promote energy conservation and emission reduction and achieve the goal of"double carbon,"the resource utilization of solid waste has become a hot issue nowadays.In this study,granite scrap was used as a raw material,and iron oxide was used as a foaming agent to prepare foamed ceramics by the powder sintering method.The effects of Fe2O3 content and sintering temperature on the pore structure and physical properties of foamed ceramics were investigated.The results show that Fe2O3 can provide foaming gas,while the iron element introduced by Fe2O3 at high temperatures exists as Fe2+and Fe3+ions,playing different roles.When the doping content is 5 wt％～15 wt％,Fe2+ions destroy the Si-O bond,reduce the melt viscosity,and promote the growth of pores.When the doping content is 20 wt％,the ratio of Fe3+/Fe2+in the melt increases,and Fe3+ions play a role in mesh reinforcement,increasing the melt viscosity and inhibiting the foaming.When the Fe2O3 content is 15 wt％and the sintering temperature is 1220 ℃,the foamed ceramic has a uniform pore structure and the best comprehensive performance,with a total porosity of 67.63％,a bulk density of 712.56 kg/m3,a compressive strength of 3.56 MPa,and a water absorption rate of 0.91％.
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