Foamed Glass-Ceramic Materials Based On Oil Shale By-Products

The feasibility and features of the production of foamed glass-ceramic materials based on oil shale ash were investigated. The optimal regime of synthesis found involved the following steps: glass fusion at 1400 deg C, preparation of the glass powders and blending with the foaming agent. The foaming was carried out at 900 to 920 deg C with a further one-stage crystallization at 790 to 820 deg C. It was noted that the admixture of calcium carbonate, as a foaming agent, changed the phase composition of the resulting glass-ceramics by an increased rate of the crystallization process and the intensive formation of gehlenite simultaneously with diopside.