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Comparative studies of the properties of fired fireclay products and products made of low-cement refractory concretes (LCC), fired at different temperatures, and non-fired concretes, used for laying the lower structure of glass-melting bath furnaces (bottom beam), have been carried out. The experimentally obtained data on thermophysical properties, thermal expansion coefficient, glass resistance of products made of NCBB and fired fireclay products are presented. The expediency of using fired fireclay products to increase the service life of the furnace is shown. Tab. 2, ill. 11, bibliography: 13 titles.
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Comprehensive studies of the phase composition of refractory concrete compositions, heat-treated in various temperature ranges, including when the glass-melting units are put into operation, have been carried out. The characteristic changes in the phase composition of unfired concrete in the process of preliminary heat treatment have been established; after firing at 1000 ° C, a new phase appears - calcium aluminosilicate 2CaO Al
2 O
3 SiO
2 , which indicates the interaction in the sample of aluminates calcium with free silica - microsilica or aluminosilicates. Il. 3, bibliography: 7 titles.
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JSC "BKO" has mastered the technology of bench assembly of glass furnace elements, first of all, the furnace bottom. To ensure the required assembly accuracy, a set of works was performed: a stand was designed and built with deviations in non-flatness ±; 0.5 mm, mastered the technology of preparation (cutting and grinding) of block products for bench assembly with minimum permissible deviations (linear dimensions ± 0.25 mm; slopes - less than 0.2 mm), the bench assembly technology itself. The developed technology was applied to the assembly of other elements of the furnace: feeder trays of the glass-forming machine, regenerator arches and loading pockets. The use of a bench assembly can significantly reduce the time for the installation of a glass-melting furnace, reduce construction costs, create favorable conditions for laying other elements of the furnace, which generally contributes to an increase in the life of the furnace. Tab. 1, ill. 7.
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One of the priority directions of diversification of JSC "BKO" is the production of products for the glass industry. In addition to the production of traditional aluminosilicate refractories, JSC "BKO" develops and produces new types of refractory materials, performs preliminary bench assembly of furnace design elements (bottom, arches of charging pockets, sub-nozzle arches, feeder trays). Specialists of JSC "BKO" provide engineering services for the design of individual units of a glass-melting furnace using materials of its own production. All design solutions are accompanied by recommendations for the performance of lining work and the setting of the lining to the operating mode. Tab. 2, ill. 6, bibliography: 7 titles.
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Presented are the refractory concrete products manufactured by the Semiluksk Refractory Plant and refractory masses used in glass-melting units. Their technical characteristics are given - strength, density, porosity, etc. Table. 1, ill. 4, bibliography: 2 titles.
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When the lining of large refractory products is brought to the operating mode, it is important to know the temperature rise of the material in order to determine the mounting clearances and to be sure that during service with an increase in the temperature gradient along the thickness of the product, destruction will not occur due to structural transformations. At the Semiluksk Refractory Plant, comparative studies of the thermophysical properties of traditional fired fireclay materials (rammed bar for the bottom of the melt bath, semi-dry pressing bar ShSU) and low-cement concrete materials on fireclay aggregate grade VShS were carried out. In the service temperature range of 600 - 1300 ° C, the materials VShBS and VShBO showed a smooth insignificant change in TCLE with increasing temperature. Tab. 1, ill. 3, bibliography: 2 titles.
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At JSC "Borovichi Refractories Plant" a set of works was carried out to master the production of chamotte block products for the lower structure of glass-melting furnaces. The features of the technology of production of products and the technological line, modernization of technological equipment, and ensuring the quality of products are considered. The physicochemical properties of ShSU-33 and MLS-62 products and their advantages over similar products from other manufacturers are presented. Tab. 1, ill. 4, bibliography: 5 titles.
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Investigations by the methods of petrography of concrete aluminosilicate materials produced by the Semiluksky refractory plant, on a fireclay filler and an integral binder based on high-alumina cement, have been carried out. Microscopic studies have shown that as a result of the heat treatment of concrete up to 380 ° C in the binder, the dehydration processes are practically completed and in the samples fired at a temperature of 1000 ° C, the formation of a glass phase, mullitization and penetration of the binder into the filler chamotte are observed. After firing, the phase composition of the binder obtained from synthetic materials is similar to the composition of the clay binder of traditional fireclay firing materials. Il. 6, bibliography: 7 titles.
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Various chemical compositions of glasses and individual features of their interaction with zirconium-containing refractories are considered. When using such refractories for laying glass-melting furnaces, it is necessary to take into account the chemical compositions of the glasses, the melting of which is planned to be carried out in these furnaces. Tab. 5, ill. 5, bibliography: 41 titles.
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Sintering of powders of finely dispersed chromium oxide has been investigated. It is shown that the production of dense non-porous samples is possible only by introducing an additive of titanium oxide and firing in a carbon-containing backfill. The optimal parameters of the technological process have been determined, the technological regulations for the process of manufacturing products from chromium oxide have been developed. The technology has been introduced into production. Tab. 5, bibliography: 3 titles.
