Abstract: To effectively utilize solid waste resources and relieve resource constraints,cordierite refractory raw materials were prepared according to the chemical composition of cordierite,using 12 mass% fused magnesia dust powder,40 mass% fused corundum dust powder and 48 mass% quartz tailings as starting materials,calcining at 1 320,1 350,1 380,1 390,1 400 and 1 410 ℃ for 3 h,respectively.The effects of the calcination temperature on the phase composition,microstructure and physical properties of the cordierite specimens were studied.The results show that below 1 390 ℃,magnesium aluminate spinel and cristobalite gradually react to form cordierite until cristobalite is completely exhausted;when the calcination temperature reaches 1 390 ℃,the cristobalite content in the sample reaches 94 mass%,and the secondary crystal phase is magnesium aluminate spinel;at this time,the sample has the optimal comprehensive performance:the lowest thermal expansion coefficient of 3.2×10^-6℃^-1,a low bulk density of 1.85 g·cm^-3,a low thermal conductivity of 1.279 W·(m·K)^-1 and dense microstructure.

Key words: fused corundum dust powder, fused magnesia dust powder, quartz tailings, solid phase synthesis method, cordierite

摘要： 为了合理利用固废资源、缓解资源紧张,根据堇青石的化学组成,以质量分数分别为12%的电熔镁砂收尘粉、40%的电熔刚玉收尘粉、48%的石英尾砂为原料,分别在1 320、1 350、1 380、1 390、1 400、1 410 ℃保温 3 h煅烧,制备堇青石质耐火原料,研究了煅烧温度对堇青石试样相组成、显微结构、物理性能等的影响。结果表明:在1 390 ℃之前,镁铝尖晶石和方石英逐渐反应生成堇青石直至方石英相完全消除,当煅烧温度达到 1 390 ℃时,试样中的堇青石相含量达94%(w),次晶相为镁铝尖晶石,此时试样的热膨胀系数最低,为3.2×10^-6℃^-1,体积密度较低,为1.85 g·cm^-3,热导率较低,为1.279 W·(m·K)^-1,显微结构较致密,综合性能最优。

关键词: 电熔刚玉收尘粉, 电熔镁砂收尘粉, 石英尾砂, 固相合成法, 堇青石