Slag and hot-slag resistance of basic refractories

Conclusions Using the instrument described, which has been improved in design for testing refractory materials for slag and hot slag resistance, we investigated the properties of magnesite, magnesite-chromite, and chrome-magnesite specimens. It was established that their life is determined by the resistance of the refractory bond. The best resistance is possessed by periclase-spinel specimens. An increase in the content of calcium oxide in the slags reduces the slag resistance of all periclase-spinel refractories that were tested. Impregnating the magnesite products with a saturated solution of chromium acetate and firing them after impregnation at 400–500°C markedly increases their slag resistance.Translated from Ogneupory, No. 7, pp. 47–52, July, 1968.     

Service tests of chrome-spinel-periclase refractories

Conclusions In chemical composition the experimental chrome-spinel-periclase refractories are characterized by a high degree of purity. The total content of impurity oxides of silicon, calcium, and iron does not exceed 2%. The parts possess increased density, porosity, and slag resistance but a lower heat resistance than the imported refractories with a silica content of 0.5%.Comparative tests of the experimental chrome-spinel-periclase parts (area of about 0.5 m²) and the imported refractories with a silica content of 0.5% in the slag belt of an ASEA-SKF installation ladle showed similar lives of them. For a final experimental test it would be desirable to produce a larger experimental production lot of the chrome-spinel-periclase refractories and to test them in the slag zone of ASEA-SKF ladles.Translated from Ogneupory, No. 1, pp. 44–47, January, 1985.     

Refractory bodies for induction furnaces

Conclusions The influence was investigated of finely dispersed additives in the form of the decomposition products of magnesium chromite, aluminum nitride, etc., on the sintering of periclase bodies.These additives permit the regulation of the degree of compacting of periclase-based lining bodies at a high temperature.An investigation of the grain size distribution, degree of compacting and firing temperature as factors in the porosity of the periclase-base product yielded equations of multiple regression which can be used for a first-approximation prediction of the properties of the lining bodies within the variation limits of the indices of the mixtures concerned.Translated from Ogneupory, No. 1, pp, 38–43, January, 1974.     

Wear of steel due to intense seizing

Dry friction of steel on steel at high pressures and sliding speeds takes place without any noticeable oxidation of the rubbing surfaces and is accompanied by intense seizing and wear. The products of wear are not oxidized and appear as shiny metal particles [1].     

Kinetic features of fayalite wetting and impregnation of magnesia in isothermal conditions

Conclusions A study was made of the impregnating rate and wetting of magnesia with molten fayalite in isothermal conditions after preliminary processing of the specimens with soluble chromium salt. The application on the surface of magnesia of a thin film of chromium oxide greatly reduces the rate of impregnation, and almost halves the degree of wetting.Translated from Ogneupory, No. 4, pp. 45–48, April, 1972.     

Properties of Ceramics Based on Al2o3 with Admixture of Unltradispersed Powder of Al2o3 Synthesized by the Electrochemical Method

Refractories and Industrial Ceramics - We present the results of investigation of the regularities of sintering and properties of corundum ceramics based on alumina with admixtures of...     

Flaw Detection of Tubural Refractory Products by the Method of Thermal Testing

Refractories and Industrial Ceramics - Flaw detection of tubular refractory products was carried out by the method of thermal testing. It is shown that the method of two-way active thermal testing...     

Acoustic and pulsating methods and devices in steel production

Methods and devices that produce effective actions on different objects in the course of steel production through the use of acoustic and pulsating vibrations are considered. Data on the results of the use of blowing tuyeres, devices for cleaning blowing tuyeres, a method of generating structuro-acoustic effects in the furnace workspace, and a device for acoustic blasting of the lens of radiation pyrometers are presented.