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ABOUT THE CONDITIONS OF BLAST FURNACE SMELTING OF PIG IRON OF A CERTAIN QUALITY

The impact of operating conditions on the quality of pig iron has been investigated on a blast furnace with a volume of1500 m3at an average cost of pulverized coal up to160 kg/ ton of pig iron. It has been established that the influence on the content of silicon in cast iron by changing the slag regime has limited possibilities. In contrast to silicon, the change in the slag regime, primarily the basicity of the effective effect on the transition of sulfur to the slag. When designing optimum for specific conditions, the technology of blast-furnace smelting should take into account the difference in the behavior of silicon and sulfur when the heating of the furnace is changed, in particular, the content of sulfur in the pig iron varies faster than the content of silicon. The decrease in the temperature of the iron from 1500 to 1400oC was accompanied by an average decrease in the content of silicon from 0.89 to 0.47%, that is, approximately twice. The same decrease in temperature led to an increase in sulfur content in the metal, on average, from 0.013 to 0.042% or more than three times. Given this difference, depending on the possibilities of further processing of cast iron, it is necessary to establish such a thermal regime, which maintains the desired levels of sulfur and silicon content, providing a certain effect in the blast furnace process and further processing. The existence of a feedback between the intensity of the smelting and the content of silicon in the pig iron is established. The existence of pulsations of the average level of sulfur content in cast iron has been confirmed. An essential difference between our observations is an increase in the period of pulsations from 3-7 to 8-11. The reasons for increasing the period require further study.