Experience in the service of furnace--ladle-type unit ladles has shown that the refractory life in them is very low in comparison with other types of units for outside-the-furnace treatment of steels as the result of the more severe service conditions [1][2][3]. Therefore, to increase the ladle refractory life it is insufficient to only have refractories with higer service properties but it would also be desirable to determine the influence of the technical parameters of steel treatment on refractory wear ~for the purpose of optimization of treatment conditions.It was established that these~parameters are the chemical composition of the slag, the length of treatment, and the length of vacuum treatment [i, 3].A study of the combined influence of these parameters on refractory wear under laboratory conditions is very difficult since on a model it is practically impossible to reproduce the actual service conditions of refractories in a ladle.In ~addition, the methods of studying the influence of technical factors on refractory wear ~used until the present have made it possible to determine the action of the slag only as the combined action of its constituent oxides.It was impossible to reveal the influence of each oxide individually or of a group of oxides.It was also established that an increased manganese oxide content promotes corrosion of the refractories, but not always, and that the cor~rosiveness of the slag is determined to some degree by its basicity [4][5][6][7].Therefore, there is special interest in processing of data accumulated in normal operation of the unit.It is natural to process the data by methods of statistical analysis,* particularly with the use of step-by-step regression [8]. However, selection of the quantitative characteristic of wear is complex.According to the generally accepted method, the wear of refractories is determined as the difference between the initial and the remaining thickness of the refractories at the completion of the ladle campaign, that is, after treatment of several frequently differing heats.With this method it is impossible to determine the influence on refractory wear of the treatment technical parameters either of each heat individually or in different periods of it.Since the treatment technical parameters change from heat to heat and even in the course of a single heat, determination of the functional relationships of refractory wear to these parameters by methods of statistical analysis is possible only with a method providing measurement of refractory wear during each heat.Taking this into consideration the change in magnesium oxide content in the slag during the course of a heat was seleted as the criterion for evaluating refractory wear in the slag zone of the ladle.This choice is based on the fact that periclase--chromite refractories containing about 60% MgO are used in the lining of the ladle slag zone while, with the exception of lime with an MgO content of 1-2%, MgO is present in not one of the heat-forming and deoxidizing components added to the ladle for...
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