METHOD OF PIG IRON AND SLAG PRODUCTION Russian patent published in 2001 - IPC

FIELD: metallurgy. SUBSTANCE: method includes supply of iron-containing charge and reducing agent to melting unit and supply of power for smelting. Smelting of charge and reduction in it of iron from oxide are begun on hot metal containing of 5-5.5% of carbon. Prior to charging of charge, melt is agitated by rotating electromagnetic field. Energy for smelting is supplied, both from rotating metal melt and from slag formed on parabolic crater. Process is conducted up to moment of carbon left in metal melt in amount of 2-3%. Then slag is discharged and carbon is introduced into remaining low-carbon pig iron up to content of 5-5.5%. Operations of iron reduction from iron oxides in charge, slag removal and carbonization are repeated up to accumulation of preset amount of low-carbon pig iron in melting unit. The last portion of slag is removed in melt rotation. Then low-carbon pig iron is saturated with carbon up to its preset amount in commercial pig iron by introduction into melt, for instance, powder wire with graphite filler. Rotation of pig iron is discontinued and preset amount of pig iron is tapped into ladle. For saturation of low-carbon pig iron with carbon, introduced into melt are slime of blast-furnace process and also red mud of alumina production, out-of-balance bauxites and lime. Carbon is introduced into zone of withdrawal of melt for heating. Supply of energy for smelting through forming slag is carried out in formed parabolic crater by combustion of fuel in the form of carbon monoxide liberating from melt in the course of reduction of iron oxides and natural gas or fuel oil. Supply of energy for smelting through formed slag is effected from two or more plasma generators. EFFECT: higher productivity of metal smelting process including that from technogenic wastes. 10 cl