Pressing refractory blocks from finegrain bodies on hydraulic presses

Min'kov, D. B.; Gromov, V. I.; Popil'skii, R. Ya.

doi:10.1007/bf01283515

Cited by 2 publications

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“…Due to defractionation of the mix the charging box, in particular its leading part, was not entirely filled which led to uneven raw object compaction and high (up to 85%) scrap for cracks even with manual levelling of the mix in the die. This phenomenon was also observed by specialists of OAO Podol'skogneupor [4], suggesting their own methods for solving this problem. Specialists of the central laboratory of automation and mechanization of OAO BKO completely examined the construction of the device for charging mix into the die and prepared a new charging rig with a gate, two charging traps and two mixing devices (Fig.…”

Section: Equipment Modernization and Automationmentioning

confidence: 64%

Development of production of chamotte block components for glass making furnaces

et al. 2008

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In the OAO Borovich Refractory Combine there is a working structure for developing output of chamotte block components of the lower structure of glass melting furnaces. Features are considered for the production technology of components and engineering lines, modernization of equipment, and the provision of product quality. Physicochemical properties are given for component grades ShSU-33 and MLS-62, and their advantages over similar products of other producers are indicated.Block components are used traditionally for lining the bottom of the melting bath of glass-making furnaces [1]. Before the start of using melting and casting baddeleyitecorundum components, large aluminosilicate components due to their considerable size and minimum number of joints have provided the required engineering life of a furnace bath, and subsequently structural stability of the lower structure of a furnace and the required heat insulation. Recent attempts to replace fired chamotte components by concrete, are not promising. Unfired low-cement concrete components require "a smooth heating-up campaign to the operating temperature" [2], as a result of which on heating they experience a continuous series of chemical and phase transformations: cement dehydration, formation of calcium aluminates, their reaction with aluminosilicate components of the matrix, in the course of which article stresses accumulate with a capacity to lead to breakdown. All of the concrete objects (fired and unfired) contain calcium aluminate, less chemically resistant to silicate glass, particularly at high temperature.

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Section: Equipment Modernization and Automationmentioning

confidence: 64%

Development of production of chamotte block components for glass making furnaces

et al. 2008

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“…Specialists from the central laboratory of automation and mechanization at Borovichi Refractory Plant JSC completely re-examined the construction of the apparatus [4] used to pour mass into the die cavity and built a new filling carriage with a sliding gate, two filling ports, and two mixing devices, which provided high-quality mass averaging during filling and complete filling of the press with powder, first the carriage and then the die cavity. The new filling device combined with a multistep pressing regime eliminated size-separation of the mix and rejection of the green compacts due to cracks and ensured structural uniformity over the entire volume of a part.…”

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confidence: 99%

Block parts for glass-making furnaces

Migal¹,

Panfilova²,

Ivanov³

et al. 2008

Glass Ceram

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Borovichi Refractory Plant JSC has performed a complex of works on manufacturing fireclay block parts for the lower structure of glass-making furnaces. The characteristics of the technology for producing the parts and the process line as well as upgrading technological equipment and guaranteeing product quality are examined. The physical and chemical properties of ShSU-33 and MLS-62 parts and the advantages of such parts over similar products from other manufacturers are presented.Block parts are ordinarily used in the masonry at the bottom of the melting tank of glass-making furnaces [1]. Before cast baddeleito-corundum parts came into use, because of their large size and the small number of seams large aluminosilicate parts provided the required furnace-tank life; now they also impart stability to the bottom structure of the furnace and reliable thermal insulation there.Work on replacing fired fireclay parts with concrete parts is now being performed [2]. It should be noted that unfired low-cement concrete parts must be put into the operating temperature regime correctly because when heated they undergo a continuous series of chemical and phase transformations: dehydration of the cement, a reaction forming calcium hexa-aluminate in the matrix, and interaction of the calcium hexa-aluminate with the aluminosilicate component of the matrix with formation of mullite and a glass phase [3]. In the course of these transformations, stresses accumulate in the parts as a result of volume changes during phase transitions, and these stresses can weaken the parts and even cause them to fail in the masonry. In fired fireclay parts, the formation of the phase composition is completed during firing at the manufacturing plant and remains unchanged during heating and operation of the furnace over the entire run.All concrete parts (fired and unfired) contain refractory cement -calcium aluminates, chemically less resistant to silicate glass, especially at high temperatures, which can result in chemical corrosion and service life reduction.In 2005, because Podol'skogneupor JSC ceased the production of fireclay block parts, the production of these parts was organized at Borovichi Refractory Plant JSC so as not to lose in Russia the production of the refractory products required by glass enterprises.The K-5000 hydraulic press (Fig. 1) and the SM-1500 continuous intense-action mixer manufactured by Tyazhstankogidropress JSC (Novosibirsk) formed the basis for the mixing-forming line. The powerful 5000 ton K-5000 hydraulic press (Germany) is a unique machine, which makes it possible to provide the force required for semi-dry pressing of large parts. Stromizmeritel' JSC (Nizhny Novgorod) manufactures and delivers mass proportioning equipment for the mixer; this equipment is well-known and needs no further consideration. In addition, a sieve was installed in front of the bucket to prevent size-separation of the mass when the bucket is loaded. Two magnetic iron separators were installed in the mass feed line from the mixer into the process...

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Pressing refractory blocks from finegrain bodies on hydraulic presses

Cited by 2 publications

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Development of production of chamotte block components for glass making furnaces

Development of production of chamotte block components for glass making furnaces

Block parts for glass-making furnaces

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