The effect of composite flux on the melting temperature of fly ash based wall insulation materials

Abstract

Fly ash was used as the main raw material, potassium feldspar and dolomite as fluxes to preparate wall insulation materials, the image sintering point tester was used to observe the changes in volume shrinkage, expansion passivation and globalization of the sample under high temperature conditions, and corresponding temperatures were recorded when the various situation occurred. The relationship between the adding ratio of the composite flux and the melting temperature was studied, and the basic formula for the preparation of fly ash foam ceramics was determined. The experimental results show that when the raw material composition is 60wt% fly ash, the total added amount of composite flux is 40wt%, potash feldspar: dolomite = 3:1, and the melting temperature range of the sample is 1150∼1365 °C, not only the initial melting temperature is lower, but the melting temperature range is also wider.