Temperature regimes for obtaining granular material for foamed crystal glass materials as a function of the batch composition

Abstract

The temperature regimes for obtaining granular glass, which is the initial material for foamed crystal glass materials, are examined as a function of the batch composition and the nature of the main glass-forming component. It is determined that batches based on natural silica-and alumina-containing materials exhibit different behavior when heated. When a batch is processed under the conditions of a commercial conveyor-type furnace, the temperature regime must be tailored to each batch in order to obtain high-quality granular glass.At the present time, one of the important problems of manufacturing foam glass is due to limited conventional raw materials base -secondary glass scrap. Previous investigations have shown that it is possible to obtain granular glassthe initial material for foamed crystal glass materials based on different types of common natural and technogenic materials by means of low-temperature (below 900°C) processing of the batch (RF Patent No. 2326841). It has been established that the amount of the glass phase in granular material must be at least 70% to obtain foamed crystal glass and 90% or more to attain low density (to 150 kg/cm 3 ). The strength of the foamed crystal glass materials, which is determined by the amount of the crystal phase and the size of the residual crystals, increases as the crystals decrease to micro-and nanometer sizes. The technological properties of the glass granulate largely depends on the composition and heat-treatment temperature of the initial batch.The objective of the present work is to determine the dependence of the heat-treatment regime for batches with the maximum amount of the glass phase in the mix on the composition of the initial batches based on silica-and aluminacontaining natural materials for the conditions of a pilot conveyor-type furnace.The temperature regime in the furnace is automatically regulated by heating zones (total length of the zones 4.5 m) and by the velocity of the conveyor belt from 1 to 25 cm/min, for which the average rates of heating of the batch up to 900°C range from 6 to 18 K/min, respectively.The following materials were used for the main components of the glass batches: marshalite (Elbashenskoe deposit), diatomite, opoka (Inzenskoe deposit), and zeolite (Sakhaptinskoe deposit), whose general properties are presented in [1, 2] and whose chemical composition is presented in Table 1. First, to determine the batch composition basic glass compositions were chosen taking account of the three-component phase diagrams. The computed values of the melting

Investigation of the Raw Materials' Composition and Ratio Influence on the Structure and Properties of the Foamed Slag Glass

“…where a -sample's length, cm; b -sample's width, cm; c -sample's height, cm; V -sample's volume, cm 3 ; M -sample's mass, g; V R T -sample's resulting volume after heat treatment at foaming temperature Т, cm 3 ; V I -sample's initial volume before heat treatment, 8 cm 3 .…”

“…Thus, the aim of the study is to develop a material that would have had all the benefits of the popular TIM and devoid of its drawbacks. One area of this research is the development of thermal insulating glass-composite materials with partial replacement of raw materials with different industrial wastes [1][2][3][4][5], one of which is ash-slag waste of thermal power plants (TPP ASW).…”

Using anthropogenic raw materials in the process of synthesizing foam glass with heterogeneous microstructure

“…Демидовича также стали весомым вкладом в организацию производства пеностекла [2]. В последующие годы многие отечественные [3][4][5][6][7][8][9][10][11][12][13][14] и зарубежные [15][16][17][18][19][20][21][22][23][24][25][26] ученые провели исследования, которые раскрыли особенности физико-химических процессов получения пеностекла. Кристаллизация -один из важных процессов, определяющих свойства пеностекла.…”