摘要
为促进节能减排,实现双碳目标,固废资源化利用已成为当下热点问题.研究以花岗岩锯泥为原料,氧化铁为发泡剂,采用粉末烧结法制备发泡陶瓷,探究了氧化铁掺量及烧结温度对发泡陶瓷孔结构及物理性能的影响.结果表明,Fe2O3可提供发泡气体,同时Fe2O3在高温下引入的铁元素以Fe2+离子和Fe3+离子存在,起到不同作用.当掺量为5 wt％～15 wt％时,Fe2+离子破坏Si-0键,降低熔体黏度,促进气孔长大;当掺量为20 wt％,熔体中Fe3+/Fe2+比例上升,Fe3+离子起到补网作用,提高熔体黏度,抑制发泡.当氧化铁掺量为15 wt％,烧结温度为1220 ℃时,制备的发泡陶瓷孔结构均匀,综合性能最佳,总孔隙率为67.63％,体积密度为712.56 kg/m3,抗压强度为3.56 MPa,吸水率为0.91％.
Abstract
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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