Synthesis technology and properties of cordierite from solid waste resources
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 tempera-ture 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 perform-ance:the lowest thermal expansion coefficient of 3.2 x 10-6 ℃-1,a low bulk density of 1.85 g·cm-3,a low thermal conductivity of 1.279 W·(m·K)-1and dense microstructure.
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维普
