METHOD OF BLAST FURNACE OPERATION AND METHOD OF MOLTEN CAST IRON PRODUCTION Russian patent published in 2017 - IPC C21B5/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, namely method of molten cast iron obtainment in a blast furnace by reduction of iron oxide material. Method involves first stage where cake loading rate is controlled along with monitoring of temperature T_top in the top furnace part, second stage where coal dust injection rate is controlled along with monitoring of apparent velocity u of furnace gas and temperature T_top in the top furnace part, third stage where saturation of oxygen-saturated air with oxygen is controlled along with monitoring of combustion temperature T_f in the tuyere and temperature T_top in the top furnace part, and fourth stage where a need to adjust injection rate of oxygen-saturated air is determined on the basis of apparent velocity u of furnace gas.

EFFECT: increased yield of blast furnace, maintenance of stable operation.

22 cl, 5 dwg, 1 tbl, 15 ex