METHOD OF BLAST-FURNACE SMELTING Russian patent published in 2006 - IPC C21B5/00 

FIELD: ferrous metallurgy; blast-furnace process.

SUBSTANCE: proposed method includes loading coke, iron-ore materials and coal through furnace top; loading is performed at different feed of iron-ore materials and coke increasing the mass of coke feed from minimum permissible magnitude determined from the following relationship: MF≥MF_base·C_base(C_base-C·C_repl), where MF and MF_base are mass of coke feed in modes of replacement of coke by coal and in base mode, t; C_base is specific consumption of coke in base mode, kg/t of cast iron; C is amount of coal fed for replacement of coke, kg/t of cast iron; C_repl is coefficient of replacement of coke by coal, kg/kg to maximum magnitude of coke feed when smooth operation and better operational parameters of furnace are obtained. Coal is mixed with iron-ore materials in each feed at weight ratio more than 6.0 of iron-ore materials to 1 ton of coal.

EFFECT: reduced consumption of coke; increased output of furnace.

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