锂渣-废玻璃基多孔陶瓷的制备及性能研究

Preparation and Performance Study of Porous Ceramics Based on Lithium Slag-Waste Glass

为有效利用锂渣和废玻璃这两种典型的工业固废和城市固废,以锂渣和废玻璃为原料,采用发泡法制备多孔陶瓷,并对其制备过程和性能进行了研究。通过调控锂渣与废玻璃的配比、烧结温度和烧结时间等参数,探究了各因素对多孔陶瓷孔隙率、体积密度、吸水率和抗压强度等性能的影响。结果表明,适当添加锂渣能够在高温下促进熔渣液相中形成少量的硅酸盐固相,从而强化陶瓷骨架的形成,改善陶瓷孔隙结构和抗压强度。然而,过量的锂渣会抑制多孔陶瓷的发泡过程。以30%锂渣和70%废玻璃为原料,在烧结温度990℃和烧结时间30 min的条件下,制备出的多孔陶瓷孔隙率为41.91%,抗压强度为7.26 MPa,体积密度为1.34 g/cm^(3),吸水率为5.85%。本研究利用工业和城市废弃物制备性能优异的多孔陶瓷,为锂渣的资源化利用提供了一定的参考,具有良好的环境和经济效益。

To effectively utilize lithium slag and waste glass,porous ceramics were prepared by using the foaming method with lithium slag and waste glass as raw materials,and the preparation process and properties were studied.The effects of ratio of lithium slag to waste glass,sintering temperature,and sintering time on the porosity,bulk density,water absorption,and compressive strength of the porous ceramics were investigated.The results showed that the appropriate addition of lithium slag could promote the formation of a small amount of silicate solid phase in the liquid phase of the slag,which enhanced the formation of a ceramic skeleton,thereby improving the pore structure and compressive strength of the ceramics.However,excessive lithium slag would inhibit the foaming process of ceramics.Under the conditions of the porous ceramics containing 30% lithium slag and 70% waste glass,sintering at 990℃ for 30 min,the porosity,compressive strength,bulk density and water absorption rate were 41.91%,7.26 MPa,1.34 g/cm^(3)and 5.85%,respectively.This research prepares high-performance porous ceramics using industrial and urban waste,providing a reference for the resource utilization of lithium slag and offering significant environmental and economic benefits.