花岗岩锯泥和大理石废石粉制备发泡陶瓷

Preparation of Foamed Ceramics from Granite Scrap and Marble Scrap

为实现“双碳”目标,推动大宗固废的资源化利用,开发探究多种固废协同制备发泡陶瓷材料的方法理论,以花岗岩锯泥和大理石废石粉为主要原料,SiC为发泡剂,通过高温烧结制备高闭气孔率的发泡陶瓷,研究原材料配比、烧结温度以及发泡剂掺量对发泡陶瓷的孔结构及性能的影响。结果表明,大理石废石粉中的CaCO_(3)在高温下分解出的CaO是有效的助熔剂,能够破坏Si—O键,降低液相的黏度,促进发泡。同时CaO能够与SiO_(2)反应生成硅灰石,提高材料的机械强度。在烧结温度为1130℃、大理石废石粉质量掺量为10%、SiC质量掺量为1.0%时,制备的发泡陶瓷孔结构均匀,综合性能最佳,闭口气孔率为79.16%,体积密度为583.42 kg/m 3,抗压强度为3.86 MPa,吸水率为0.40%。本研究为花岗岩锯泥和大理石废石粉回收利用制备发泡陶瓷提供了理论基础。

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 CaCO_(3) 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 SiO_(2) 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 1130℃,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/m 3,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.