Use of industrial residues for production of cellular glasses of low environmental impact

Cellular glass has special properties such as low thermal conductivity, which has attracted attention to production processes that improve its properties and are sustainable. Studies aim to produce cellular glass using residues of different natures, being this the objective of this work. Therefore, were used recycled bottle glasses and fly ash for the pore formation, which were characterized as the chemical composition, phases present and thermal behavior. Samples with additions of 10% and 30% of ash, were shaped and burned in the temperatures of 700 °C, 800 °C and 900 °C, for characterization of pore architecture and physical properties. The results show that the residue used presents C-rich phases for the formation of pores, obtaining cellular glass with sponge-like architecture and porosity values close to 76% and density of 0.66 g cm⁻³ or the sample burned at 900 °C with additions of 10%. According to the conditions used, it was verified that the lower ash content and higher temperatures were limiting conditions for the process, reaching the ideal condition of 10% of ash and 800 °C of burning due to the low variation provided by the increase of this temperature. (paper)