Synthesis of foam glass based on natural silica raw material

This article discusses the possibility of using sedimentary rock as the main component in the synthesis of foamglass. For this purpose, prototypes were synthesized based on the flask of the Botchinsky field, which has a fine-grained structure and a polymineral composition. The foamglass was synthesized using a one-stage powder technology; the samples were fired in the temperature range of 800-900 °C for 20 minutes, followed by annealing for 2-3 minutes. During the experiment, several se-ries of samples with different charge compositions were developed, in particular, sodium hydroxide and sodium fluoride were added to some to intensify the foaming process and increase the sinterability of the resulting material. As a result of studying the synthesis of foamglass at different temperature conditions, it was found that: a mixture of additives reduced the melting point of the sample to 850 °C; the addition of NaF significantly increased the density of the samples, but did not affect the porosity; the presence of NaOH in the mixture made it possible to obtain a sintered sample with a density below 1000 kg/m3. The conclusion was made about the possible potential use of synthesized foamglass based on flask in produc-tion, subject to further research.