METHOD OF CREATING PROTECTIVE SCULL OF BLAST FURNACE Russian patent published in 2025 - IPC C21B5/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to ferrous metallurgy, particularly to blast-furnace process. Formation of protective scull is carried out in blowing period after overhaul when achieving theoretical combustion temperature (TCT) 2150-2250 °C. At that, for operating conditions of blast furnace with natural gas consumption of 60-290 m³/t of cast iron in near-wall zone of mouth of blast furnace for a day in each 2-12 feed is charged scull-forming mixture. Further, theoretical combustion temperature is reduced at a rate of reduction of TCT 3.0-5.0 °C/day to level of theoretical combustion temperature 1680-1750 °C, while continuing to load the scull-forming mixture into the near-wall zone of the mouth.

EFFECT: invention reduces consumption of coke and prolongs the overhaul period of the blast furnace.

3 cl, 2 dwg, 6 tbl