Abstract: In order to prepare low-cost foamed ceramics with high porosity and compressive strength,foamed ceramics samples were prepared at different temperatures (1 180,1 200,1 220 and 1 240 ℃) for different durations (10,20,40 and 60 min),using fly ash,lithium slag,feldspar,talcum and silicon carbide as raw materials.The effects of the lithium slag addition (0,10%,20% and 30%,by mass) on the phase composition,microstructure,porosity,and compressive strength of the samples were studied.The results show that:(1)with the increase of the lithium slag addition,the porosity of the samples increases;the bulk density decreases;the compressive strength fluctuates;(2)the calcium and sulfur components in lithium slag work as the fluxing agent and foaming agent,which reduces the sintering temperature,increases the porosity,improves the pore roundness and enhances the compressive strength;(3)when the lithium slag addition is 20%,for the sample obtained at 1 220 ℃ for 20-40 min,the bulk density is 0.32-0.40 g·cm^-3,the porosity is 84.4%-87.6% and the compressive strength is 1.51-2.35 MPa.

Key words: fly ash, lithium slag, foamed ceramic, solid waste coordination, compressive strength, porosity

摘要： 为制备低成本兼具高孔隙率与高压缩强度的发泡陶瓷,以粉煤灰、锂渣、长石、滑石和碳化硅为原料,经1 180、1 200、1 220、1 240 ℃分别保温10、20、40、60 min烧结制备发泡陶瓷试样。主要研究了锂渣的掺量(质量分数分别为0、10%、20%、30%)对试样物相组成、显微结构、孔隙率及压缩强度的影响。结果表明:1)随锂渣掺量的增加,发泡陶瓷的孔隙率增加,体积密度降低,压缩强度波动;2)锂渣中丰富的钙、硫成分,可发挥助熔剂和发泡剂作用,降低烧结温度,提高发泡陶瓷的孔隙率,改善气孔圆整度,提高压缩强度;3)当锂渣掺量为20%(w)时,经1 220 ℃保温20~40 min烧结所得发泡陶瓷的体积密度为0.32~0.40 g·cm^-3,孔隙率为84.4%~87.6%,压缩强度为1.51~2.35 MPa。

关键词: 粉煤灰, 锂渣, 发泡陶瓷, 固废协同, 压缩强度, 孔隙率