关键词: 煅烧温度, 粉煤灰漂珠, 多孔莫来石, 铝矾土, 显微结构

Abstract:

For improve the high value-added utilization of fly ash floater,porous mullite ceramic materials were prepared by adhesion method and solid-phase sintering using fly ash floater as the template,bauxite as the aluminum source,AlF₃ and V₂O₅ as the additives.Effects of the calcination temperature (1 100,1 200,1 300,and 1 350 ℃,respectively) on the phase composition,the microstructure and the properties of the prepared materials were studied.The results show that: when the temperature changes from 1 100 ℃ to 1 350 ℃,the diffraction peaks of the mullite gradually increase,and these of the quartz gradually weaken until disappear,the apparent porosity of the specimens increases firstly and then decreases,while the bulk density and the compressive strength are on the contrary;when the calcination temperature is 1 300 ℃,the specimen has the apparent porosity of 68.4%,the bulk density of 0.72 g·cm^-3,and the compressive strength of 14.6 MPa.

Key words: calcination temperature, fly ash floater, porous mullite, bauxite, microstructure