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• W2346115593 abstract "Application a previously modified final converter slag skull to the working layer of a lining by blowing through a lance with a jet of nitrogen is an effective way of increasing the life of an oxygen converter. Formation of a skull at a converter lining surface occurs due to hardening of a slag suspension, prepared by modifying the final converter slag with magnesia materials and with emergence of heat through the converter lining, i.e. from an inner layer in contact with a slag suspension to the outer layer. Hardening (loss of mobility) of slag and skull formation is observed when the volume fraction of solid phases crystallizing within it crosses a boundary, required for their percolation, forming a solid carcase within the volume of slag. The dynamics of skull formation at the surface of a converter lining determines its thermophysical properties, primarily heat resistance, depending on the residual thickness, and also the temperature field; the temperature of the final slag, prepared for application to converter walls; the thermal effect of slag hardening; the volume fraction of solid phases, contained in a slag suspension. In the HMCT faculty of SPbGTI (TU) on the basis of thermophysical presentations about skull formation using an experimental information base and thermodynamic modelling of the effect of heat of crystallization for a modified slag suspension, a software package has been developed intended for planning the dynamics of skull formation at the surface of an oxygen converter lining and optimizing the consumption of the final converter slag and modifier [2] (Fig. 1). In order to use the software package developed under conditions of specific converter production it is necessary to create a production statistical information base, including the following information: – chemical composition of the final converter slag, remaining for skull application operation; – the amount and temperature of remaining slag; – the temperature of the converter working lining surface after discharging the melt; – the residual thickness of the converter lining layer; – the thermophysical properties of refractory materials of the converter lining. This information is required for modification of the chemical and phase composition of the final converter slag, providing an increase in its hardening temperature to the temperature level of the lining surface, and prediction of skull formation dynamics in order to optimize the time regime for the process. Modelling of the process showed that the dynamics of skull formation at an oxygen converter lining surface does not depend linearly on the duration of the process (skull formation slows down with an increase in its thickness and inherent heat resistance), and also on the residual thickness of the lining working layer (Fig. 2). The rate of skull formation is slow in the initial stages of the lining campaign and increases sharply during lining operation with a reduction in working layer thickness. The practical data provided in scientific and technical publications [3, 4] confirms that the life of a lining is not distributed uniformly over a whole converter campaign. The different dynamics of skull formation with a change in residRefractories and Industrial Ceramics Vol. 52, No. 1, May, 2011" @default.
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• W2346115593 date "2011-01-01" @default.
• W2346115593 modified "2023-09-24" @default.
• W2346115593 title "SCIENTIFIC RESEARCH AND DEVELOPMENT PLANNING OF SKULL FORMATION AT AN OXYGEN CONVERTER LINING SURFACE AND OPTIMIZATION OF MODIFIER CONSUMPTION" @default.
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