Service of rammed crucibles for melting noble metals in induction furnaces

Conclusions We prepared and tested in service crucibles of fused magnesium oxide with special additions, having a considerably higher resistance in induction-furnace conditions at temperatures of about 2000°C. The additives guaranteed the necessary sintering of the working zone in the crucible, and helped to form a direct bond between the crystals of periclase.The structure of the used crucibles is described. The formation of the zone structure is connected with the temperature gradient, and in the hot zones is accompanied by intensive recrystallization and growth of periclase crystals.Translated from Ogneupory, No. 5, pp. 19–23, May, 1969.     

Use of zirconia refractories for lining high-temperature induction furnaces

Conclusions A lining was prepared from zirconia (sectors) which can guarantee the induction heating of refractory alloy blanks up to temperatures of 2300°C in a protective atmosphere. The zirconia sectors placed in the working zones showed the maximum wear. The sectors failed due to splitting, cracking, and scaling of the working surface.The service life of the lining depends on the number of heatings of the blank, the variations in temperature, and the degree of cooling in the lining between heatings. It can be determined only by using refractories in industrial induction furnaces.Translated from Ogneupory, No. 3, pp. 32–36, March, 1971.     

Quartzites for crucibles and methods of lining crucible induction furnaces (Review)

Conclusions With observation of the requirements of chemical and grain-size compositions, progressive methods of lining work, and sintering of the crucible, domestic quartzites provide a long lining life of induction crucible furnaces in melting of iron and sufficient life in melting of carbon steel.Translated from Ogneupory, No. 6, pp. 48–52, June, 1985.     

Dolomite-dunite mixture as a patching material for steel melting furnaces

Conclusions Production tests have been made of a dolomite-dunite mixture in the 250–650 ton open hearths of the Makeevka, Krivoi Rog, and Kommunarsk Metallurgical Combines in patching the rear walls, banks, and front bulkheads. The tests established no differences in use of the mixture in comparison with fired dolomite and no differences were established in the process.A specification has been developed for the mixture and full-scale production of it has been organized at Nikitov Dolomite Plant and Northern Dolomite Combine.The work was done under a contract with the Southern Refractory State Production Union with direct participation of the personnel of Nikitov Dolomite Plant, Northern Dolomite Combine, and the Krivoi Rog, Makeevka, and Kommunarsk Metallurgical Combines.Translated from Ogneupory, No. 6, pp. 32–33, June, 1992.     

Refractory for lining induction furnaces

Conclusions Studies established that the lining body made from Karel'sk quartzites is not inferior to the Swedish material used for lining induction furnaces by many foreign companies.The great reserves and favorable mining conditions for obtaining these materials enable us to examine quartzite from the central Karel'sk area as raw materials for producing the lining bodies of induction furnaces.Translated from Ogneupory, No.5, pp.39–42, May, 1972.     

Corundum-zircon crucibles for induction melting of nickel alloys

Refractories and Industrial Ceramics -     

A high-alumina lining for crucible-type induction furnaces

Conclusions In crucible-type induction furnaces, the durability of a lining of compound MLM-1 (Technical Specifications 14-8-119-74) is several times higher than that of a quartzite lining or a sintered lining based on corundum and kyanite-sillimanite concentrate. The compound can be recommended for crucible furnaces when melting high-grade cast iron and steel.The density of compound MKE-78 can be increased by adding up to 20% synthetic corundum No. 6 and 3–4% orthophosphoric acid solution. Its high refractoriness makes it possible to use this lining as well for melting steel with a casting temperature of 1680–1700°C Its durability in this case is at least 2 months.Translated from Ogneupory, No. 3, pp. 24–28, March, 1977.