Refractory concrete blocks for lining tunnel kiln cars

Refractories and Industrial Ceramics - Testing has indicated that the service life of block lining is greater than that of brick by a factor of one and a half to two. The replacement of brick by...     

Refractory lining of coke ovens

A new technological solution that makes it possible to reduce the duration of coking and increases the effi-ciency of coke ovens is described. The effect is provided by lining the walls of the coke oven with shaped dinas refractories with a blind hole in the form of a truncated cone. Translated from Ogneupory i Tekhnicheskaya Keramika, No. 7, pp. 42, July, 2000.     

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.     

Use of magnesite concrete in open-hearth furnaces

Conclusions Many years practical experience with the use of refractory magnesite concretes in open-hearth furnaces at the KMZ confirmed that it is rational to use them even for preparing concretes and blocks on the working sites of open-hearth shops, and it also confirmed the unacceptability of open-hearth furnace structures for placing the concretes.A project for a furnace framework should be developed bearing in mind the use of blocks of maximum sizes which will accelerate repairs.Simultaneously with the increase in the output of chrome-magnesite mixture for the production of concrete it is necessary to produce this mixture with greater fineness for the wash materials.Translated from Ogneupory, No. 6, pp.31–35, June, 1972.     

Stabilization of lining elements of the working zone of open-hearth furnaces

Various factors affecting the stability of lining elements of the working zone of the open-hearth furnaces at the Azovstal' Works are studied. The main reasons for damage to the open-hearth furnace tanks are deterioration of the quality (high content of SiO₂ and CaO) of magnesite powders (Satkinskoe deposit) and exclusion of the high-phosphorus cast iron from the conversion process. Damage to the weld bead and charging layer results from formation and modifying transformations of bicalcium silicate. The improvement of the maintenance procedure, production of new bottoms, and charging of the working zone of the open-hearth furnace with magnesite powders imported from Slovakia (the special chemical composition of these powders prevents formation of bicalcium silicate) adopted at the Azovstal' Works make it possible to increase the stability of the lining, substantially decrease the magnesite powder consumption, and reduce the labor input and time for maintenance. Translated from Ogneupory i Tekhnicheskaya Keramika, No. 5, pp. 36–39, May, 1997.     

VOD钢包无铬耐火材料衬的开发

介绍了真空吹氧脱碳(VOD)的情况、VOD钢包衬的开发、试验方法、试验结果以及最佳化的VOD包衬。该最佳化炉衬由沥青结合的镁碳炉底、沥青结合的镁碳包壁、陶瓷结合的镁白云石延展渣线区以及陶瓷结合的白云石净空部位组成。     

Unfired brick from magnesite-chromite concrete for open-hearth furnace building

Conclusions Unfired brick made of magnesite-chromite concrete with periclase cement, tested in several parts of open-hearth furnaces, showed the same resistance as fired magnesite or chrome-magnesite refractories.Unfired magnesite-chromite brick made of concrete can be used for building structures with air-setting, water-containing cement instead of iron plates.It is necessary to organize the industrial production of unfired goods made of magnesite-chromite concrete using the method developed by UNIIO for extensive testing and subsequent use in open-hearth furnaces.     

Refractory lining of a furnace for pyrolysis of dichlorethane

Conclusions Compositions of thermal-insulation concrete mixtures from which various elements of the lining of a furnace for pyrolysis of dichlorethane were produced have been developed. Burner blocks for the gas burners of the furnace were produced by vibrocasting.The refractories developed have provided reliable operation of the furnace, and for three years they have been in good condition.Translated from Ogneupory, No. 7/8, pp. 27–29, July–August, 1992.     

Improvement in the steel-pouring ladle lining life in open-hearth production of ZAO metallurgical plant Petrostal’

Basic principles are considered for the development of refractory linings for steel-pouring ladles operating under severe conditions using a furnace-ladle unit. Joint action of personnel of the metallurgical enterprise and refractory supplier makes it possible to determine the local area of lining wear and to adopt timely measures for improving life. The effect of the main factors governing wear is determined. The order of selecting the required standard sizes and quality indices for objects taking account of the type of metal smelted is determined. Translated from Novye Ogneupory, No. 4, pp. 66 – 72, April 2009.     

A concrete for lining blast furnace shafts

Conclusions A composition of refractory concrete based on mullite-corundum chamotte, silicon carbide, and high-alumina cement has been developed for repair of blast furnace shafts.It has been shown that under normal conditions after hardening the concrete possesses a dense structure and sufficiently high strength. In heating to 1400°C the strength and density of the concrete drop, reaching a minimum at 1100°C which is sufficient for normal service of the blast furnace.Alkali-resistance tests of the concrete were made on a stand under conditions of a reducing medium and it was shown that under the action of alkalis and CO a zonal structure with the greatest change in properties in the working zone is formed.The concrete developed was used for preparation of a large-block cooled panel for the shaft of No. 2 blast furnace of Il'ich Metallurgical Combine. The panel has been in service since 1985.Translated from Ogneupory, No. 6, pp. 47–50, June, 1989.