The influence of clinoptilolite amorphizatton on the intensity of compositions’ foaming for the foam glass production

The article presents the results of studies on the effect of preliminary amorphization of clinoptilolite on the intensity of compositions foaming for the foam glass production. The expediency of using the zeolite-containing tuff of the Kholinsk deposit (Transbaikal region) and the main technological flux agents, such as sodium carbonate and sodium silicate for the production of foam glass is proved. It was found that the optimal concentration of Na2CO3 in the composition of the charge is 15 wt. %. The degree of amorphization of zeolite tuffs after charge heating at 300; 400 and 500 оС is estimated. It was found that the density of granules after calcination increases with increasing Na2CO3 content in the charge. An increase in the Na2CO3 content of the composition may cause loosening of the mass and increase in the porosity of the dried granule. Optimal preparation conditions of raw materials for the foam glass production have been found. Composition with 15 wt. % Na2CO3 with grinding to a specific surface of 3457 cm2/g, preheating the dry mixture at 500 °C, moistening the heated mixture with an aqueous solution of Na2SiO3, shaping the granules from the mass, bringing the granules to air-dry state, and roasting in the range of 800-900 °C can be considered effective.