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.

Effect of Ca and Mg on the properties of foamed ceramics prepared with multisolid waste

“…Flux plays an important role in the composition of foamed ceramics, reducing their softening and melting temperatures and allowing minerals to react at lower temperatures. 16,17 Alkaline fluxes are commonly used in foaming ceramics, including the alkali metals K 2 O, Na 2 O, and the alkali earth metals CaO and MgO. 18,19 Foaming ceramics commonly used in fluxes are feldspar, perlite, serpentine, wollastonite, talc, calcite, dolomite, etc.…”

“…18,19 Foaming ceramics commonly used in fluxes are feldspar, perlite, serpentine, wollastonite, talc, calcite, dolomite, etc. 17 Zhou et al 20 studied the effect of CaO content on the bulk density, pore structure, and compressive strength of foamed ceramics. The results show that a small amount of CaO improves the compressive strength.…”

“…Alkaline fluxes are commonly used in foaming ceramics, including the alkali metals K 2 O, Na 2 O, and the alkali earth metals CaO and MgO 18,19 . Foaming ceramics commonly used in fluxes are feldspar, perlite, serpentine, wollastonite, talc, calcite, dolomite, etc 17 . Zhou et al 20 .…”