Chemical technology of cellular glass production

Abstract

Cellular glass by its composition, structure and technical parameters is a high-performance multifunctional material, and its use in construction and engineering is extremely important. The problem of developing cellular glass power consumption technology on the base of natural amorphous aluminosilicates and silica rocks in a single technological process, combining the synthesis of a given glass composition and the formation of its cellular structure is solved by introduction of a nanodispersed modifier into the rock and by the mechanical activation of the charge, creating an impact possibility in the system at the atomic-molecular level. With the involvement of a complex modern theoretical and experimental methods, the processes of glass wool rock modifyed sintering and expanding were investigated, which served as a base for creating the cellular glass technology in the form of products and granules. The study of the secondary glass synthesis dynamics during sintering of volcanic glasses with sodium hydroxide solution showed that the hydrated amorphous neoplasms of sodium silicates synthesized at low temperatures and silica aluminosilicates with temperature rise gradually enriched with silica and formed hydrated secondary glasses, the dehydration of which expanded the mass upon reaching the pyroplastic state. Power consumption technologies of the new type cellular glasses based on the volcanic glass-wool and other amorphous silicate rocks, which allow to combine the processes of synthesis of low-melting glass and its expansion by sintering are challenging for the production and for application in construction and engineering.

Investigation into the viability of the properties of porous glass-ceramics produced from granite dust and maize cob for use in thermal insulation of external walls of residential buildings

“…Sometimes, chemical reagents can be used to facilitate the one-step production process of porous glass-ceramics at a lower temperature as in the case in this study. According to [17], it is possible to save energy required in the production of porous glass-ceramics obtained from naturally occuring silicate and aluminoslicate containing rocks by eliminating preliminary melting of glass in such a way that both the glass formation and formation of cellular structure are combined in a single process [17].…”

Properties of glass-ceramics foam based on granite dust-clay-maize cob composite as a sustainable building material

“…Hence, using natural raw materials such as granite dust which are available in abundance and are suitable for the production of glass-ceramics foam is necessary [29]. Single-step sintering of glass-ceramics foam based on aluminosilicate rocks provides an energy-saving route that eliminates preliminary glass melting by making it possible to combine the formation of a glassy phase and its cellular structure in a single technological process [30]. In this respect, glass-ceramics foam have been prepared based on: siliceous rocks and thermonatrite (Na 2 CO 3 •H 2 O) [31], waste quartz sand and coal gangue [32], tripoli with the addition of microsilica (10-50 wt.%) and 45% NaOH [27], and diatomite and 40% NaOH [33] among others.…”

Study on the thermal conductivity and density of foam glass

“…By decreasing particle size or increasing milling time the density of the foam glass decreases. Furthermore, decreasing the glass particle size leads to a decrease in the sintering temperature [14][15][16]. König et al [15] studied the glass particle size effect on the foaming process, as well as the density, and the microstructure of the foam glass.…”