Study on Thermal Insulation Zeolite by Coal Fly Ash

Abstract EN

This paper takes the coal fly ash as the material and makes zeolite with low thermal conductivity under a two-step synthesis for the purpose of thermal insulation.

It studies main factors affecting zeolite such as the different concentration of NaOH, the solid-liquid ratio, the silica-alumina ratio, and the crystallization temperature.

The optimal conditions were obtained that the NaOH concentration was 3 mol/L, the solid-liquid ratio was 10 : 1, the silica-alumina ratio was 2, and the crystallization temperature was 12°C.

Zeolites have multiple pores and skeletal structures under SEM observation.

The mean particle size was 2.78 um of concentrated distribution.

The pore volume was 0.148 m3/g measured by BET analysis, the specific surface was 118.6 m2/g, and the thermal conductivity was 0.153 W/(m·K).

Zeolite was proved to be a qualified insulation material which can be used in thermal insulation coating as a new material of energy conservation.