Preparation and characterization of foamed ceramics from coal bottom ash for construction insulation materials

Foamed ceramic is a novel lightweight wall material combining high strength, low density, and excellent thermal insulation. This study used coal bottom ash (CBA) to fabricate microporous foamed ceramics by the high-temperature foaming method. The CBA content heating rate effects on bulk compressive pore structure, phase components of were systematically investigated. results demonstrate that using in can effectively improve green body capacity. With increased content, density dropped, while average size shape factor increased, jointly reducing strength. Meanwhile, quartz decreased, mullite appeared gradually. transition main crystalline from MgAl2O4 Mg0.7Fe0.23Al1.97O4 with gave rise change color ceramic. elevation ability body, contributing porosity. However, rapid 10 °C/min an uneven distribution containing more than 70 wt % CBA. It increases temperature difference sample, promoting stratified samples less 30 %.