METHOD FOR OPERATING BLAST FURNACE Russian patent published in 2019 - IPC C21B5/00 

FIELD: technological processes.

SUBSTANCE: invention relates to a method for producing pig iron in a blast furnace. Method includes loading iron ore and coke from the top of the furnace, injecting coal dust into the furnace through a conventional tuyere, injecting gas containing hydrogen and/or hydrocarbon, through the usual lance together with coal dust, removing carbon dioxide and water vapor from the blast furnace exhaust gas from the top of the furnace with injection of the produced gas through the shaft lance of the furnace and injection of the furnace's top gas through a conventional lance without heating thereof, the blast of the usual lance is enriched with oxygen, and the oxygen enrichment is not less than 10 % and not more than Y % according to the following formula: Y=0.079×CH₄+32, where CH₄ denotes the amount of methane, vol.%, in the gas blown through the usual lance.

EFFECT: sharp reduction in CO₂ emissions and stable iron production over a long period of time using an industrial blast furnace.

7 cl, 10 dwg, 6 tbl