Alumina-Periclase-Carbon Refractories Produced by OOO Ogneupor

Refractories and Industrial Ceramics - Technology for producing alumina-periclase-carbon refractories of the brands APUK-D and APU-D is developed and implemented. Use of complex antioxidant and...     

Development of waste-free technology for periclase-carbon refractory production

Results are provided for a study of product nonconformity during manufacture of periclase-carbon ladle refractories and refractory scrap as a potential raw material source. Optimum charge compositions are given with addition of secondary refractories and a production scheme for the manufacture of periclase-carbon refractory objects taking account of existing technology in the OOO Ogneupor magnesium-dolomite refractory workshop. Pilot batches of objects are produced for industrial tests, confirming a lack of deterioration in operating properties.     

Developing a chromium-bearing starting mixture from Ural raw materials

A chromium-bearing starting mixture derived from Ural raw materials is investigated. Its properties resemble those of imported Feurolan SM 70A20 mixture. Industrial tests show that the Russian version is competitive with the imported mixture.     

Composition and Fabrication of Magnesia Briquettes from Refractory Scrap for Repairing the Lining of Oxygen Converters

A technology for fabrication of refractory briquettes from spent periclase and periclase-carbon materials salvaged from decommissioned steel ladles has been developed. The briquettes can be used as a patching material to repair the worn refractory lining in oxygen converters. Tests of the patching briquettes were conducted at the MISW JSC with satisfactory results.__________Translated from Novye Ogneupory, No. 1, pp. 17 – 19, January, 2005.     

Manufacturing injection units for intermediate ladles at OAO MMK

A device is designed for injecting argon into metal melt in the intermediate ladle during casting. The corresponding manufacturing technology is developed. Model tests of gas-permeable inserts for the injection device reveal the optimal design. The resulting capillary structure of the permeable concrete inserts with directional porosity is characterized by high strength and uniformity and permits regulation of the gas permeability by adjusting the number of vaporizing inclusions, their dimensions, and their configuration.     

Development of optimum composition of a batch for periclase-carbon lining of steel-teeming ladles of AFM shops

Results of a study of the effect of antioxidant additives, i.e., metallic aluminum and titanium diboride, on the quality parameters of periclase-carbon ladle refractories are presented. Laboratory studies have shown that the addition of the studied antioxidants into the batch increases the strength and lowers the porosity of the specimens. The size of the decarburized layer due to the addition of metallic aluminum and titanium diboride is virtually the same, but the use of TiB₂ adds additional strength to the decarburized and transition layers of the specimens. It is recommended that pilot tests be performed for joint introduction of the additives. __________ Translated from Novye Ogneupory, No. 11, pp. 56–58, November, 2007.     

Development of technology for preparing blowing partitions for intermediate ladles

The construction of a multislotted insert is developed for an intermediate ladle partition. Model tests of blowing inserts are performed and their optimum construction is determined. Blowing partitions are prepared and industrial testing is successful under the acid-converter shop working conditions at OAO Magnitogorsk Metallurgical Combine. Blowing partitions with inserts having four rows of channels are recommended for industrial application from the test results. Translated from Novye Ogneupory, No. 8, pp. 16–17, August 2008.     

Torcrete mix of basic composition for converter lining

Results are presented for a laboratory study of the substance composition of a periclase-carbon torcrete mix for restoring a converter lining, comparative methods for testing a torcrete mix under laboratory conditions, and the main production parameters for a torcrete mix under existing production conditions. Industrial tests are performed in the converter section of the OAO MMK oxygen-converter workshop. The life of a torcrete layer is two melts.     

Preparation of iron-bearing wastes for industrial use

To permit the industrial use of sintering and steel-smelting slurries at OAO MMK, laboratory research is undertaken on the formulation of briquets with specified chemical composition and mechanical strength. In the batch for slurry briquetting, it proves expedient to add rolling scale; a binder consisting of ligno-sulfonate powder and portland cement provides the optimum briquet strength.