METHOD OF BLAST-FURNACE MELTING Russian patent published in 2008 - IPC C21B5/00 

FIELD: metallurgy.

SUBSTANCE: invention concerns ferrous metallurgy. Particularly it concerns technique of blast-furnace melting. Method includes introduction into furnace charge pellet, agglomerate, coke, metallic additions and flux, electro steel-smelting slag of oxidising period of fraction 10-80 mm with content 25-44% FeO, 5-23% of buckshot and basicity 1.8-3.6 at following ration of materials, wt %: agglomerate 40-74; pellet 5-25; ore not more than 3.5; metallic additions not more than 10; coke 15-26; coal 1-6; electro steel-smelting slag of oxidising period 0.1-18, at that ratio CaO/SiO₂ of furnace charge is kept up 0.80-1.10.

EFFECT: reduction of cast iron cost price, improving of blast furnace productivity, refining of melted cast iron.