Protective coatings as a means of improving heat resistance of the refractory lining for extra-furnace steelmaking facilities

Protective coatings based on metallic aluminum are developed that can be used to improve the resistance of the refractory lining for extra-furnace steelmaking facilities. By sintering a slurry sprayed on the refractory surface, a heat-resistant gas-impermeable coating containing -corundum is formed.__________Translated from Novye Ogneupory, No. 10, pp. 61 – 63, October, 2004.     

New Carbon-Containing Refractories for the Lining of Steel-Teeming Ladles from the Kombinat Magnezit Joint-Stock Co.

Test results for new carbon-containing refractories for the lining of steel-teeming ladles — PUSK, PShUK, PShUP, PUPK, and ShPUP-grade, available from the Kombinat Magnezit JSC, are presented. The properties of refractory components (including heat resistance) in the as-received and subjected to coking condition are reported. The enhanced resistance of the new materials to thermal spalling under varying temperature conditions is noted. Results of the tests (carried out at the Magnitigorsk Iron-and-Steel Works and Oskol'skii Electrical ISW) provide the basis for an analysis of the economic feasibility of large-scale production of these materials.     

Periclase-carbon composite refractories with a new complex binder

We describe the development of the technology of periclase-carbon composite refractories with a new complex binder, which combines the properties of phenolic resins and coal-tar pitch. Theoretical analysis and the results of application in steel teeming ladle lining show that a combination of these thermoreactive and thermoplastic components in the new binder provides a more compact (denser) structure of the coke framework (residue) possessing increased resistance to oxidation. Articles made of the new composite refractory have been successfully tested in the lining of steel teeming ladles. The wear characteristics of new lining materials in steel ladles has been studied. __________ Translated from Novye Ogneupory, No. 8, pp. 14–20, August, 2007.     

High-density periclase clinker: A promising material for refractory production

Data on testing sintered periclase clinker obtained from flotation magnesite concentrate for the production of refractory parts are presented. It is shown that by organizing production of high-density periclase powders in the plant from flotation magnesite concentrate with the minimum possible content of impurity SiO₂ and CaO oxides the quality of the products can be improved with a much longer service life provided for linings of heating installations.     

Investigation of refractories based on hollow periclase-containing granules

Conclusions The investigation into the possibility of obtaining periclase-spinel refractories of the PShPKh type based on fused materials and hollow KhGSh granules obtained on the Plazmatron equipment, showed unsatisfactory sintering of the granules with finely milled bond and, as a result, poor factors for compressed strength and refractoriness- under-load.In order to improve the production technology for refractories based on hollow KhGSh it would be of interest to activate the surface of the granules with various mineralizers and to choose finely milled bond.The authors wish to thank V. A. Naumenko (Podol'sk Refractories Factory) for assistance in this work.Translated from Ogneupory, No. 6, pp. 15–18, June, 1991.     

Refractories for the Taphole of Converters

A range of refractory materials for the converter's taphole lining commercially available from the Kombinat Magnezit Joint-Stock Co. and major aspects of the processing technology are considered. The effective use of antioxidant additions is confirmed by thermal analysis. Results of operational tests of refractory materials are discussed. The advantages of an innovative design of the taphole unit composed of blocks of variable diameter and assembled on a metal template are emphasized. An economic feasibility analysis of the use of periclase-carbon taphole blocks is given. The newly designed refractory material are shown to conform with the requirements of modern converter technology.     

The Heat Conductivity of Carbon-Containing Refractories

Results of an experimental study of the heat conductivity of carbon-containing refractories, commercially available from the Magnezit Kombinat JSC, a leading manufacturer in the field in Russia, are presented. Heat conductivity anisotropy has been revealed in most materials studied. The heat conductivity in the pressing force direction is shown to be smaller than in the perpendicular direction. For comparison, data on analogous carbon-free refractories are considered.     

Structural Features of Heavy-Duty Periclase-Spinellide Refractories Prepared from Chrome Ores of Different Origins

Chrome ores are natural mineral formations of magmatic origin composed mainly of chrome spinellide and accessory minerals crystallized from basaltic and ultra-basic magmas. They are also called chromites or, after the name of the main component — native chrome spinellides.     

MgO−Al2O3−Cr2O3 refractories of increased corrosion resistance for nonferrous metallurgical furnaces

The paper sums up a study that had as its objective to develop MgO−Al₂O₃−Cr₂O₃ refractories of increased corrosion resistance for harsh service conditions. The refractories thus developed, designated PShKhM-1 and PShKhM-2, have better high-temperature strength and abrasion resistance than PKhS refractories manufactured commercially. The experimental refractories will enhance the durability of furnace and converter linings, extend their campaigns, step up their productivity, and reduce consumption of refractories and repair costs. Translated from Ogneupory i Tekhnicheskaya Keramika, No. 1, pp. 33–37, January, 1998.